JP2017090378A - Sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive sensor according to a monitoring item and a monitoring target.SOLUTION: A sensor 10 comprises: a detection unit 50 including a detection element 60; a first substrate 70 electrically connected to the detection element 60; and a second substrate 80 electrically connected to the first substrate 70.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sensor.

  As disclosed in Patent Document 1, a sensor is used for the purpose of monitoring changes in the characteristics and state of an atmosphere made of fluid or the like. The sensor generally includes a detection element, a circuit board electrically connected to the detection element, and a housing that holds the circuit board. The circuit board converts electric power supplied from an external power source into electric power corresponding to the detection element, and supplies the electric power to the detection element. In addition, the circuit board monitors the electrical output value from the detection element according to the characteristics and state of the atmosphere to be monitored, and controls the alarm lamp, warning buzzer, and the like.

  By the way, such a sensor is applied to an extremely wide variety of fields. If the monitoring items (characteristic values to be measured, etc.) are different, different detection elements are used, and it is also necessary to prepare a circuit board corresponding to the detection elements. Even if the same type of detection element is used, the electrical output value should be converted to a different range if the monitoring target (the atmosphere in which the characteristic value or the like is to be measured, for example, the operating oil or lubricating oil of the device) is different. It is also assumed that it is necessary to manage the alarm by evaluating the electrical output value according to different criteria. From the above, conventionally, various combinations of detection elements and circuit boards have been prepared to cope with various monitoring items and objects to be monitored.

JP 2008-249689 A

  However, depending on the monitoring item and monitoring target, newly preparing the entire circuit board each time increases the manufacturing cost of the circuit board, the management cost, and the sensor manufacturing cost. It was. The present invention has been made in consideration of the above points, and an object thereof is to provide a sensor according to a monitoring item or a monitoring target at a low cost.

The sensor according to the present invention comprises:
A detection unit including a detection element;
A first substrate electrically connected to the detection element;
A second substrate electrically connected to the first substrate.

  In the sensor according to the present invention, the detection unit may be detachable from the first substrate.

The sensor according to the present invention further comprises a connector electrically connected to both the first substrate and the second substrate,
The connector may be detachable from at least one of the first substrate and the second substrate.

The sensor according to the present invention further comprises a housing for holding the detection unit, the first substrate, and the second substrate,
At least one of the detection unit, the first substrate, and the second substrate may be detachable from the housing.

In the sensor according to the invention,
The housing includes a housing body that holds the detection unit on one side in one direction, and a cover that is detachably attached to the housing body from the other side in the one direction.
The housing body has a mounting engagement portion used for mounting the sensor between a portion where the cover along the one direction is mounted and a portion holding the detection unit.
In a state where the cover is removed from the housing body, at least one of the first substrate and the second substrate may be removable from the housing body.

In the sensor according to the invention,
The housing includes a housing body that holds the detection unit on one side in one direction, and a cover that is detachably attached to the housing body from the other side in the one direction.
A part of the second substrate located on the one side in the one direction is detachably held by the casing body, and extends from the casing body to the space in the cover to the other side in the one direction. It may be out.

In the sensor according to the invention,
The housing main body extends in the one direction to hold the detection unit, a mount portion positioned on the other side of the shaft-like portion in the one direction and thicker than the shaft-shaped portion, Have
The mount portion holds the portion located on the one side of the second substrate;
A peripheral edge portion forming an opening located on the one side in the one direction of the cover may be detachably held around the mount portion.

In the sensor according to the invention,
The mount portion has a groove extending linearly in the one direction and opened to the other side in the one direction;
A side edge of the second substrate may be detachably inserted into the groove of the mount portion.

In the sensor according to the invention,
The housing includes a housing body that holds the detection unit on one side in one direction, and a cover that is detachably attached to the housing body from the other side in the one direction.
The housing body is a housing space opened to the other side in the one direction, and has a housing space capable of housing at least a part of the first substrate,
The first substrate may be removably held in the housing body by being inserted into the housing space of the housing body from the other side toward the one side along the one direction. Good.

In the sensor according to the invention,
In a state where the first substrate is held by the housing main body, a part of the first substrate located on the other side in the one direction extends from the housing main body to the space in the cover in the one direction. It may extend to the other side.

In the sensor according to the invention,
The detection unit has a terminal portion that is electrically connected to the detection element and located in the accommodation space;
The first substrate has a terminal portion that is electrically connected to the terminal portion of the detection unit;
The terminal portion of the first substrate and the terminal portion of the detection unit are inserted into the housing space of the housing body from the other side toward the one side along the one direction. By doing so, you may make it automatically electrically connect.

  ADVANTAGE OF THE INVENTION According to this invention, the sensor according to the monitoring item and the monitoring object can be provided at low cost.

FIG. 1 is a diagram for explaining an embodiment of the present invention and is a diagram for explaining a use state of a sensor. FIG. 2 is a perspective view showing the sensor shown in FIG. FIG. 3 is a perspective view showing the sensor shown in FIG. 2 from a direction different from that in FIG. FIG. 4 is a perspective view showing the sensor shown in FIG. 3 with the cover removed. FIG. 5 is a longitudinal sectional view showing the sensor shown in FIG. 6 is a view showing a cross section taken along line VI-VI in FIG. FIG. 7 is a view showing a cross section taken along line VII-VII in FIG. FIG. 8 is a view showing a cross section taken along line VIII-VIII in FIG. FIG. 9 is an exploded perspective view showing the sensor shown in FIG. FIG. 10 is a plan view showing an example of a detection element that can be incorporated in the sensor. FIG. 11 is a view showing a cross section taken along line XI-XI in FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual product.

  1 to 11 show a sensor 10 according to an embodiment of the present invention. Among these, FIG. 1 shows the usage state of the sensor 10. The sensor 10 is a device for measuring the characteristics and state of the fluid and atmosphere to be monitored. As shown in FIG. 1, in one specific example described below, the sensor 10 is attached to a pipe 101 of a device (for example, hydraulic equipment) 100 using oil (for example, hydraulic oil), and moisture dissolved in the oil. The water activity value aw that serves as an index for evaluating the amount is measured. That is, in an example described below, the monitoring target of the sensor 10 is a liquid in the apparatus, more specifically oil, and the monitoring item of the sensor 10 is the water activity value aw in the oil. The water activity value aw is a value obtained by dividing the water vapor pressure in the oil by the saturated water vapor pressure of the oil, and is the same as the numerical value obtained by dividing the relative humidity in oil [unit:%] by 100.

  In one embodiment described below, a device for providing the sensor 10 according to a monitoring item or a monitoring target at a low cost is made. The device proposed below can be widely applied to sensors that monitor liquids other than oil, fluids, atmospheres, etc., and sensors that measure items other than the water activity value sw as monitoring items. It is.

  As shown in FIG. 5, the sensor 10 includes a housing 20, a detection unit 50, a first substrate 70, and a second substrate 80. The housing 20 holds the detection unit 50, the first substrate 70, and the second substrate 80. The detection unit 50 is disposed in an oil atmosphere to be monitored, and transmits an electrical signal corresponding to the water activity value aw that is a monitoring item. The first substrate 70 and the second substrate 80 include a circuit for receiving electric power from the outside and supplying it to the detection unit 50 and a circuit for processing an electrical signal from the detection unit 50. The first substrate 70 and the second substrate 80 are separate bodies, and the above-described circuits are appropriately divided and mounted on the first substrate 70 or the second substrate 80. The division of the circuit is performed so as to give versatility to at least one of the first substrate 70 and the second substrate 80. And at least one of the 1st board | substrate 70 and the 2nd board | substrate 80 has versatility, and the manufacturing cost of the sensor 10 is made cheap by sharing at least one of the monitoring object and the monitoring item between different sensors. Is realized.

  Hereinafter, each component of the sensor 10 will be described in detail.

  First, the housing 20 will be described. As understood from FIGS. 1 to 9, the housing 20 includes a housing body 25 and a cover 45. The housing body 25 and the cover 45 form an internal space 21 that accommodates the first substrate 70 and the second substrate 80. The housing 20 further includes a protective member 23 attached to the housing body 25.

  As shown in FIG. 2, the housing body 25 holds a detection unit 50 on one side in one direction da. The detection element 60 of the detection unit 50 extends from the housing body 25 to one side in one direction da. The protective member 23 forms a space in which the detection element 60 is accommodated with the housing body 25. As shown in FIG. 1, the protection member 23 is immersed in the oil to be monitored together with the detection element 60. A large number of communication holes 24 are formed in the protection member 23. The oil can pass through the communication hole 24 and flow into a space that houses the detection element 60 formed between the housing body 25 and the protection member 23. The protection member 23 is a substantially cylindrical member with one opening on the side opposite to the housing body 25 being closed. The protection member 23 protects the detection element 60 from foreign matters such as wear powder floating in the oil. The protective member 23 is preferably formed from a material having excellent resistance to the oil to be monitored. Moreover, it is preferable that the housing body 25 is also formed of a material having excellent resistance to the oil to be monitored.

  In the illustrated example, the sensor 10 has a longitudinal axis as a whole, and the one direction da coincides with this axial line. Hereinafter, the one direction da is also referred to as an axial direction da. One side in one direction da is referred to as a distal end side in the axial direction da, and the other side in one direction da is referred to as a proximal end side in the axial direction da.

  As shown in FIGS. 5 and 6, the housing 20 includes a housing body 25 and a cover 45 that is detachably attached to the housing body 25. The housing body 25 holds the detection unit 50 on the tip side in the axial direction da. The cover 45 has a generally cylindrical outer shape in which one opening is closed. The cover 45 is attached to the housing body 25 from the other side in the axial direction da. In the present embodiment, at least a part of the housing 20, for example, the housing body 25 may be made of ceramics. In this case, it is possible to make it difficult for heat from the oil to be monitored to be transmitted to the second substrate 80 via the housing body 25.

  As illustrated in FIGS. 4 to 6, the housing body 25 includes a shaft-shaped portion 30, a nut portion 33, and a mount portion 35. The shaft portion 30, the nut portion 33, and the mount portion 35 are provided in this order from the distal end side to the proximal end side along the axial direction da.

  As shown in FIGS. 5 and 6, the shaft-like portion 30 holds the detection unit 50. Further, the shaft-shaped portion 30 has an attachment engaging portion 31 and a holding engagement portion 32. Among these, the holding engagement portion 32 is a portion that holds the protection member 23. The holding engaging portion 32 has a male screw that is screwed with a female screw provided on the protective member 23. As shown in FIG. 1, the attachment engaging portion 31 is a portion used for installing the sensor 10 to the device 100. The attachment engaging portion 31 has a male screw that is screwed with a female screw provided in the holding hole 102 of the device 100.

  As shown in FIGS. 5 and 6, the nut portion 33 has a width wider than that of the shaft-like portion 30. In other words, the nut portion 33 is thicker than the shaft-like portion 30 in the dimension perpendicular to the axial direction da. The nut portion 33 is formed in a nut shape. The sensor 10 can be fixed to the holding hole 102 of the apparatus 100 by gripping the nut portion 33 with a tool such as a spanner and rotating the entire sensor around the axis of the sensor 10.

  As shown in FIGS. 5 and 6, the mount portion 35 has a wider width than the shaft-like portion 30 and the nut portion 33. In other words, the mount portion 35 is thicker than the shaft-shaped portion 30 and the nut portion 33 in the dimension in the direction orthogonal to the axial direction da. The mount part 35 is a part that holds the cover 45 in a removable manner. The mount portion 35 is formed with a step portion 36 that engages with the cover 45. As shown in FIG. 4, in the stepped portion 36, the width of the mount portion 35 is thicker at the distal end side in the axial direction da than at the proximal end side. As shown in FIGS. 5 and 6, the step portion 36 positions the cover 45 with respect to the housing body 25 along the axial direction da. A screw hole 37 and a sealing member 38 are provided in a portion covered with the cover 45 of the mount portion 35. The screw hole 37 is used when the cover 45 is fixed to the housing body 25. The sealing member 38 is, for example, an O-ring. The sealing member 38 closes the gap between the housing body 25 and the cover 45 and seals the internal space 21 of the housing 20 formed by the housing body 25 and the cover 45.

  As shown in FIGS. 5 and 6, the housing body 25 is formed with a hollow portion extending in the axial direction da. The housing body 25 is formed as a cylindrical member extending in the axial direction da as a whole. However, the hollow portion of the housing body 25 is closed by the wall portion 22 on the distal end side in the axial direction da. A detection unit 50 is held on the wall portion 22. Further, the first substrate 70 is inserted into the hollow portion of the housing body 25 from the opening on the proximal end side in the axial direction da. That is, the hollow portion of the housing body 25 functions as the accommodation space 26 that accommodates the first substrate 70. The cover 45 covers the housing body 25 from the base end side in the axial direction da. The hollow portion of the housing body 25 forms a part of the internal space 21 of the housing 20.

  As shown in FIGS. 5 and 6, the hollow portion of the housing body 25 that forms the accommodation space 26 is wide on the proximal end side in the axial direction da. As shown in FIG. 9, the proximal end portion of the accommodation space 26 in the axial direction da is formed by a recess 40 that opens toward the proximal end in the axial direction da. The recess 40 is formed in the mount portion 35. As shown in FIG. 8, the indentation 40 has a substantially rectangular shape that is wide in the lateral direction (left-right direction in the plane of FIG. 8) on the plane orthogonal to the axial direction da. As shown in FIGS. 4 and 9, a groove 41 is formed in each of the pair of side wall portions forming the recess 40. A pair of groove | channel 41 is arrange | positioned facing the horizontal direction. As shown in FIG. 4, the side edge 80 a of the second substrate 80 is inserted into the pair of grooves 41. Accordingly, the recess 40 that forms a part of the hollow portion of the housing body 25 functions as the accommodation space 26 that accommodates the second substrate 80.

  As shown in FIGS. 5 and 6, the cover 45 has a cylindrical outer shape extending in the axial direction da. However, the base end side in the axial direction da of the cylindrical outer shape is closed. As shown in FIG. 3, a connection portion 46 is provided on the base end side end surface of the cover 45. The connection unit 46 functions as a terminal for ensuring electrical connection between the outside and the first substrate 70 and the second substrate 80 disposed in the housing 20. Further, as shown in FIG. 3, a hole for exposing the lamp 85 of the second substrate 80 is formed in the end surface on the base end side of the cover 45.

  As shown in FIGS. 5 and 6, the cover 45 opens to the tip side in the axial direction da. As shown in FIG. 5, the peripheral edge portion 47 that forms the opening on the front end side of the cover 45 engages with the step portion 36 formed in the mount portion 35. A screw receiving hole 48 is formed in the cover 45 at a position facing the screw hole 37 of the mount portion 35. The cover 45 is fixed to the housing body 25 by the screw 27 penetrating the screw receiving hole 48 being screwed into the screw hole 37. The internal space 21 of the housing 20 that houses the first substrate 70 and the second substrate 80 is formed by the internal space of the cover 45 and the housing space 26 of the housing body 25.

  The cover 45 can be removed from the housing body 25 by removing the screw 27. That is, the cover 45 can be attached to and detached from the housing body 25. In particular, in the illustrated example, the mount portion 35 to which the cover 45 is attached is located on the proximal end side in the axial direction da with respect to the shaft-shaped portion 30 provided with the holding engagement portion 32. That is, as shown in FIG. 1, the mounting engagement portion 31 for mounting the sensor 10 on the apparatus 100 is positioned between the mount portion 35 and the detection element 60 along the axial direction da. Therefore, the cover 45 can be attached to and detached from the housing body 25 in a state where the sensor 10 is attached to the apparatus 100.

  As well shown in FIG. 9, a support member 43 is fixed to the mount portion 35 of the housing body 25 of the housing 20. The support member 43 supports the base end side of the second substrate 80 by being connected to an auxiliary support plate portion 82 (described later) of the second substrate 80. The support member 43 extends from the mount portion 35 toward the proximal end along the axial direction da as a rod-like or cylindrical member. More specifically, the support member 43 extends from a region below the second substrate 80 (on the opposite side of the first substrate 70) in the base end side surface of the mount portion 35. In the illustrated example, the pair of support members 43 are provided apart from each other in the lateral direction (direction parallel to the width direction of the second substrate 80). In this case, the pair of support members 43 are made of the same member, and are arranged so that their axes are parallel to each other. In the present embodiment, the support member 43 is a rod-shaped or cylindrical member having a hexagonal cross section, but is not limited thereto, and is not limited to this, but a rod-shaped body or a cylindrical body having a circular cross-section, a triangular shape, a quadrangular shape, etc. Or it is good also as a flat member. Note that one or three or more support members 43 may be provided.

  Next, the detection unit 50 will be described. As shown in FIG. 9, the detection unit 50 includes a detection element 60 and a terminal portion 52 that is electrically connected to the detection element 60. The terminal portion 52 is held by the distal end side wall portion 22 of the housing body 25. The terminal portion 52 passes through the distal end side wall portion 22 of the housing body 25 and extends into the hollow portion of the housing body 25. That is, as shown in FIGS. 5 and 6, in a state where the detection unit 50 is held in the housing 20, the detection element 60 is located outside the internal space 21, and the terminal portion 52 connected to the detection element 60 is , Penetrating from the outside of the internal space 21 through the tip side wall portion. In the illustrated example, the terminal portion 52 is a pair of metal rod-shaped members.

  Note that the detection unit 50 may be detachable from the housing 20 (housing body 25) by making the terminal portion 52 made of a rod-like member detachable from the distal end side wall portion 22. According to this example, the detection element 60 can be replaced in a short time by a simple operation such as removal and insertion along the axial direction da.

  The detection element 60 is held by the housing 20 and exposed to the monitoring target of the sensor 10. The detection element 60 outputs an electrical signal corresponding to the monitoring item. In the present embodiment, the oil flows into the space defined by the protective member 23 and the tip of the housing body 25 through the communication hole 24, and the detection element 60 held in the space is in the oil. Retained. And the detection element 60 outputs the electric signal corresponding to the water activity value aw of the said oil, for example, the voltage corresponding to the water activity value aw.

  Here, a specific example of the detection element 60 for measuring the water activity value aw will be described with reference to FIGS. 10 and 11. In the example shown in FIGS. 10 and 11, the detection element 60 includes a support plate portion 61, a first electrode 62 supported by the support plate portion 61, a second electrode 63, and a sensitive film 64. Yes. The 1st electrode 62, the sensitive film | membrane 64, and the 2nd electrode 63 are laminated | stacked on the support plate part 61 in this order. The first electrode 62 is electrically connected to one of the pair of terminal portions 52 via the first terminal 66. The second electrode 63 is electrically connected to the other of the pair of terminal portions 52 via the second terminal 67. The first electrode 62 and the second electrode 63 are made of a metal material such as chromium, and the sensitive film 64 is made of an organic insulator that desorbs water molecules such as polyimide.

  The first electrode 62 and the second electrode 63 are held in a non-contact state by the sensitive film 64 from each other. As a specific configuration, the sensitive film 64 has a slightly larger plan view shape than the first electrode 62 and the second electrode 63. The periphery of the sensitive film 64 protrudes from the first electrode 62 and the second electrode 63, and the first electrode 62 and the sensitive film 64 are not in direct contact.

  In such a detection element 60, water molecules are adsorbed and desorbed from the sensitive film 64 through the exposed portion protruding from the second electrode 63 and the second electrode 63. When the moisture content of the oil around the detection element 60 is stabilized, the adsorption of water molecules to the sensitive film 64 is balanced with the oil. For example, if the amount of water molecules contained in the oil increases, the amount of water molecules adsorbed on the sensitive membrane 64 also increases, and if the amount of water molecules contained in the oil decreases, the amount of water molecules adsorbed on the sensitive membrane 64 also increases. Decrease. The capacitance between the first electrode 62 and the second electrode 63 changes due to the adsorption and desorption of water molecules on the sensitive film 64. Based on the capacitance between the first electrode 62 and the second electrode 63, the amount of water contained in the oil can be detected.

  Next, the first substrate 70 will be described. As well shown in FIG. 4, the first substrate 70 is held in the accommodation space 26 of the housing body 25. In particular, in the present embodiment, the first substrate 70 is held by the housing body 25 by being inserted into the housing space 26 of the housing body 25 from the proximal end side toward the distal end side along the axial direction da. The However, the first substrate 70 can be attached to and detached from the housing body 25 from which the cover 45 is removed. As shown in FIGS. 4 to 6, in the state where the first substrate 70 is held by the housing body 25, the end portion of the first substrate 70 located on the proximal side in the axial direction da is the housing body 25. Extends to the space in the cover 45 toward the proximal end in the axial direction da. By grasping the extended portion, the first substrate 70 can be easily attached to and detached from the housing body 25.

  As shown well in FIG. 9, the first substrate 70 includes a first support plate portion 71, a first circuit 72 supported by the first support plate portion 71, a terminal portion 73, and a connector terminal 74. Have. Of these, the first circuit 72 will be described later. The first support plate portion 71 is a plate-like member and functions as a support member for supporting the first circuit 72 and the like. The first support plate portion 71 is made of, for example, an insulating resin plate. In order to facilitate attachment / detachment and positioning of the first substrate 70 with respect to the housing body 25, it is preferable that a groove extending in the axial direction da is provided on an inner wall forming the housing space 26 of the housing body 25. . By engaging the side edge of the first support plate portion 71 with this groove, the first substrate 70 can be stably disposed in a predetermined position in the accommodation space 26.

  As shown in FIG. 5, the terminal portion 73 is in contact with the terminal portion 52 of the detection unit 50 to ensure electrical connection between the first substrate 70 and the detection unit 50. As shown in FIGS. 5 and 9, the terminal portion 73 is formed in a socket shape that opens toward the distal end side in the axial direction da. The terminal portion 73 is electrically connected to the terminal portion 52 by receiving the terminal portion 52 of the detection unit 50 extending toward the base end side in the axial direction da. In particular, in the illustrated example, the terminal portion 73 of the first substrate 70 and the terminal portion 52 of the detection unit 50 are located in the housing space 26 of the housing body 25 from the proximal end side toward the distal end side along the axial direction da. By inserting the first substrate 70, it is automatically electrically connected. At this time, the first substrate 70 is positioned in the axial direction da, and the first substrate 70 and the detection element 60 are fixed by the engagement between the socket-like terminal portion 73 and the terminal portion 52. Thereby, the first substrate 70 is fixed to the housing body 25 together with the detection unit 50.

  The engagement between the socket-like terminal portion 73 and the terminal portion 52 is released by applying an external force that pulls the first substrate 70 from the distal end side to the proximal end side along the axial direction da. In other words, the first substrate 70 can be attached to and detached from the detection unit 50, and is also detachably fixed to the first substrate 70 holding the detection unit 50.

  As shown in FIG. 4, one end of the first connector 91 is detachable from the connector terminal 74. The other end of the first connector 91 is detachable from the first connector terminal 86 of the second substrate 80. That is, the first connector 91 includes a first circuit 72 electrically connected to the connector terminal 74 of the first substrate 70, a second circuit 84 electrically connected to the first connector terminal 86 of the second substrate 80, An electrical connection between the two can be ensured. In the illustrated example, the connector terminal 74 is provided in a portion of the first support plate portion 71 that extends from the housing body 25 to the space in the cover 45 toward the base end side in the axial direction da. . Therefore, the first connector 91 can be easily attached to and detached from the connector terminal 74 in a state where the first substrate 70 is held at a predetermined position with respect to the housing body 25.

  In addition, the 1st connector 91 and the 2nd connector 92 and the 3rd connector 93 which are mentioned later are typically shown in FIG. 4, and illustration is abbreviate | omitted in the other figure.

  Next, the second substrate 80 will be described. As shown in FIGS. 5 and 6, the second substrate 80 is held in the internal space 21 of the housing 20 defined by the housing body 25 and the cover 45, similarly to the first substrate 70. As described above, the side edge 80a of the second substrate 80 is fitted into the groove 41 formed in the mount portion 35 of the housing body 25, so that the second substrate 80 is detachably held by the housing body 25. (See FIGS. 4 and 9). At this time, as shown in FIG. 4, most of the second substrate 80 is located outside the housing space 26 of the housing body 25 and extends from the housing body 25 to the proximal side along the axial direction da. ing.

  In the illustrated example, the second substrate 80 includes a second support plate portion 81 including a side edge 80 a that engages with the groove 41, and an auxiliary support plate coupled to the second support plate portion 81 via a connection member 83. Part 82. Both the second support plate portion 81 and the auxiliary support plate portion 82 are plate-like members made of an insulating material. As shown in FIGS. 4 and 5, the connecting member 83 has the second support plate portion 81 and the auxiliary support plate portion so that the plate surface of the second support plate portion 81 and the plate surface of the auxiliary support plate portion 82 are orthogonal to each other. 82 is connected. Accordingly, the second support plate portion 81 and the auxiliary support plate portion 82 are substantially L-shaped when viewed from the side (see FIG. 55). The auxiliary support plate portion 82 is formed with a hole at a position facing the end surface on the base end side in the axial direction da of the support member 43, and the screw 95 is screwed into the support member 43 through the hole. Yes. As a result, the second substrate 80 is fixed to the support member 43 via the screw 95 at the base end portion, and is fixed to the housing body 25 via the groove 41 at the tip end portion. By fixing the second substrate 80 to the housing 20 at both ends in the axial direction da, the second substrate 80 can be stably held at a predetermined position in the internal space 21 of the housing 20. The second substrate 80 can be removed from the housing body 25 by pulling the second substrate 80 toward the proximal end in the axial direction da after removing the screw 95. That is, the second substrate 80 can be detached from the housing 20 in a state where the cover 45 is removed from the housing body 25.

  As shown in FIG. 4, the second support plate portion 81 is provided with a second circuit 84, a first connector terminal 86, a second connector terminal 87, and a third connector terminal 88. On the other hand, the auxiliary support plate portion 82 is provided with a lamp (light emitting element) 85. The second circuit 84 will be described later together with the first circuit 72. As described above, the first connector terminal 86 is detachably connected to the first connector 91. The first connector 91 ensures electrical connection between the first board 70 and the second board 80.

  As shown in FIG. 4, one end of the second connector 92 is detachable from the second connector terminal 87 electrically connected to the second circuit 84. The other end of the second connector 92 is detachable from the connecting portion 46 of the cover 45. That is, the second connector 92 can ensure electrical connection between the second substrate 80 and the outside. The second connector terminal 87 may be connected to the first connector terminal 86 via the second circuit 84, or may be connected to the first connector terminal 86 without passing through the second circuit 84. May be. In the latter case, the second connector 92 and the first connector 91 can directly connect the first circuit 72 to the outside without passing through the second circuit 84.

  Furthermore, one end of the third connector 93 is detachable from the third connector terminal 88. The other end of the third connector 93 is detachable from the lamp 85 supported by the auxiliary support plate 82. The third connector terminal 88 is electrically connected to one or more of the second circuit 84, the first connector terminal 86, and the second connector terminal 87. Accordingly, lighting, blinking, extinguishing, etc. of the lamp 85 can be controlled by the first circuit 72 or the second circuit 84. In the illustrated example, three lamps 85 are provided. For example, when it is detected that the water activity value aw of the oil to be monitored by the sensor 10 is a normal value, the first lamp 85 is turned on and the water activity value aw of the oil is set to a predetermined value. The second lamp 85 is lit when the value is equal to or greater than the value, and the third lamp 85 is lit when the water activity value aw of the oil is greater than or equal to a predetermined value greater than a preset value. Good. That is, the lamp 85 is for informing the user of the approximate amount of water contained in the oil, and the actual measured value of the water activity value aw detected by the detection element 60 is an external output connected to the connection unit 46. It can be confirmed with the device. Further, when an abnormality occurs in the sensor 10 itself, the failure may be notified by turning on the three lamps 85. The lamp 85 is made of a light emitting diode, for example. In the present embodiment, the lamp 85 is provided on the auxiliary support plate portion 82. However, the present invention is not limited to this, and a separate support plate is provided on the side edge 80a side of the second support plate portion 81, and A lamp 85 may be provided.

  By the way, as shown in FIGS. 5 and 8, the second support plate portion 81 that supports the second circuit 84 is supported in the vertical direction perpendicular to the axial direction da (vertical direction in the plane of FIG. 5 and FIG. 8). The member 43 is disposed apart from the member 43. The second support plate portion 81 is in contact with the housing 20 only at the tip end portion in the axial direction da. That is, the second support plate portion 81 is in direct contact with the housing 20 only by the groove 41. Further, an auxiliary support plate portion 82 is provided at the base end side end portion of the second support plate portion 81, and the support member 43 is connected to the auxiliary support plate portion 82. Generally, when a temperature change occurs in the device 100 to which the sensor 10 is attached or the oil to be monitored, the housing 20 that is in contact with the device 100 or the oil is likely to change in temperature. Since the second support plate portion 81 is not in contact with the housing 20 in a large area, a rapid temperature change of the second circuit 84 is difficult to occur. Therefore, the intended function of the second circuit 84 can be stably exhibited.

  Further, as well shown in FIGS. 8 and 9, the support member 43 is a pair of rod-shaped or cylindrical members that are spaced apart from each other in the lateral direction (left-right direction in the plane of FIG. 8 and FIG. 9). It is. Therefore, the space between the pair of support members 43 can be used effectively. In the illustrated example, the lamp 85 is located between the pair of support members 43 in the lateral direction orthogonal to the axial direction da. The third connector 93 that is electrically connected to the lamp 85 passes between the pair of support members 43 and is electrically connected to the lamp 85 penetrating the auxiliary support plate portion 82. As a result, the sensor 10 can be downsized.

  Furthermore, as shown in FIGS. 4 to 6, both the first substrate 70 and the second substrate 80 are arranged in a partial region along the axial direction da. Specifically, both the first substrate 70 and the second substrate 80 are disposed in the mount portion 35 and a partial region on the base end side of the mount portion 35. As shown in FIGS. 7 and 8, in this region, the first substrate 70 and the second substrate 80 are perpendicular to the axial direction da so as not to interfere with each other (vertical direction in the plane of FIG. 7 and FIG. 8). And partially overlap each other when viewed from the longitudinal direction (see FIGS. 5 and 6). That is, in the illustrated example, the first substrate 70 and the second substrate 80 are shifted in the vertical direction so that the first substrate 70 and the second substrate 80 are at least partially in the axial direction da orthogonal to the vertical direction. Can be arranged in overlapping areas. According to such an arrangement of the first substrate 70 and the second substrate 80, the dimension in the axial direction da of the sensor 10 can be reduced by utilizing the vertical space.

  Next, the first circuit 72 and the second circuit 84 will be described.

  The sensor 10 includes a detection element 60 selected according to a monitoring item by the sensor 10, that is, a detection element 60 selected according to a characteristic or state to be monitored. The sensor 10 effectively operates the detection element 60 and outputs a circuit for outputting an electrical output value from the detection element 60 as an evaluation index of a monitoring item (water activity value aw in the illustrated example). Have. The circuits included in the first substrate 70 and the second substrate 80 include a circuit that should be changed according to the detection element 60 used in combination, and a circuit that can be used in common for predetermined different detection elements 60. Exist. As a circuit to be changed according to the detection element 60, a circuit that converts an output from the detection element 60 into an electrical output value corresponding to a monitoring item by the sensor 10, for example, a current value, can be exemplified. On the other hand, as a circuit that can be commonly used for predetermined different detection elements 60, a circuit that removes noise of power supplied from an external power source, or a transformer circuit that converts voltage from an external power source Etc. can be illustrated.

  Further, even between the sensors 10 having the detection elements 60 corresponding to the same monitoring item, it is preferable to partially change the circuits included in the first substrate 70 and the second substrate 80 if the monitoring targets are different. There is also. For example, when the absolute value of the characteristic value or state value that becomes the monitoring item varies greatly depending on the monitoring target, it is preferable to change the range of the electrical output value and output it. In this example, it is preferable to change the circuit that amplifies the output from the detection element 60 according to the monitoring target of the sensor 10. Furthermore, if the monitoring target is different, that is, depending on what kind of apparatus 100 the sensor 10 is installed on, the application and purpose of the sensor 10 also change greatly. Accordingly, even when the same sensor 10 is used, it is necessary to adjust the conditions under which the warning light or alarm buzzer included in the sensor 10 is turned on or sounding according to the installation target, application, purpose, etc. of the sensor 10. .

  That is, the circuits 72 and 84 incorporated in the sensor 10 and electrically connected to the detection element 60 should be designed depending on the monitoring items and monitoring targets of the sensor 10. On the other hand, a part of the circuits 72 and 84 can be used in common without depending on the monitoring items and monitoring targets of the sensor 10. Therefore, depending on whether the first circuit 72 and the second circuit 84 are divided, one of the first substrate 70 and the second substrate 80 can be used in common among sensors having different monitoring items and monitoring targets. . That is, the division of the first circuit 72 and the second circuit 84 can be implemented so as to provide versatility to at least one of the first substrate 70 and the second substrate 80. When at least one of the first substrate 70 and the second substrate 80 has versatility, the one substrate having versatility can be shared between the sensors 10 having different monitoring targets and monitoring items. It becomes possible, and the manufacturing cost of the sensor 10 can be reduced.

Here, it demonstrates more concretely according to the example shown in figure. In the illustrated example, the sensor 10 measures the water activity value aw as a monitoring item for the oil of the device 100 such as a hydraulic device to be monitored. Such a sensor 10 includes the following circuits as an example.
Circuit (A): A circuit that converts electric power received from an external power source via the connection unit 46 in accordance with driving power of the detection element 60. For example, a DC-DC converter circuit.
Circuit (B): A circuit that removes noise included in the power received from the external power source via the connection unit 46.
Circuit (C): a circuit that converts the electrical signal output from the detection element 60 into an electrical output value as an index corresponding to the water activity value aw that is a monitoring item. For example, a circuit that converts an output voltage from the detection element 60 into a current value in a predetermined range.
Circuit (D): A circuit that controls the light emission state of the lamp 85 based on the electrical output value generated by the circuit (C).

  Among the circuits exemplified above, the circuits (A), (C), and (D) are circuits with low versatility, and are to measure monitoring items (characteristics and states) different from the water activity value aw. It is expected that it cannot be used in combination with the intended detection element. On the other hand, the circuit (B) is a highly versatile circuit and can be expected to be used in common regardless of the type and accuracy of the detection element 60. Therefore, the circuits (A), (C), and (D) are mounted on one of the first substrate 70 and the second substrate 80, and the circuit ( When B) is mounted, there is a possibility that the board including the circuit (B) can be used in common between sensors with different monitoring items and monitoring targets.

  Further, even in the sensor 10 having the detection element 60 that measures the water activity value aw, if the accuracy of the detection element 60, the purpose of installation of the sensor 10 and the like are different based on the difference in the monitoring target of the sensor 10, the circuit It is also expected that (A) and (D) cannot be diverted. Accordingly, the circuits (A) and (D) are mounted on one of the first substrate 70 and the second substrate 80, and the circuits (B) and (D) are mounted on the other of the first substrate 70 and the second substrate 80. When C) is mounted, the substrate including the circuits (B) and (C) can be shared between sensors for measuring water activity values with different monitoring targets.

  And if at least one part of a circuit can be used in common between sensors in which at least one of the monitoring item, the monitoring target, and the monitoring purpose is different, the manufacturing cost of the sensor 10 can be reduced.

  Next, an operation when the sensor 10 having the above configuration is used will be described.

  First, the sensor 10 is installed in the pipe 101 of the apparatus 100 to be monitored. A holding hole 102 is formed in the pipe 101. The sensor 10 is inserted into the holding hole 102 from the front end side along the axial direction da. Next, the nut portion 33 is gripped with a tool, and the sensor 10 is rotated in the holding hole 102. At this time, the male screw of the mounting engagement portion 31 is engaged with the female screw formed in the holding hole 102, and the mounting engagement portion 31 is screwed into the holding hole 102. Thereby, the attachment to the piping 101 of the apparatus 100 of the sensor 10 is completed.

  In the pipe 101, the oil to be monitored flows into the protective member 23 through the communication hole 24. The detection element 60 immersed in oil in the protective member 23 outputs an electric signal corresponding to the water activity value aw of the oil. The electrical signal from the detection element 60 is converted into an electrical output value by the first circuit 72 of the first substrate 70 and the second circuit 84 of the second substrate 80. Based on the electrical output value, the water activity value aw of the oil is evaluated. The lamp 85 is controlled based on the evaluation result of the water activity value aw, and the lamp 85 is turned on, turned off, or blinked. In addition, the water activity value aw of the oil is displayed on the external device electrically connected via the connection unit 46.

  By the way, while the oil in the pipe 101 is monitored using the sensor 10, when the oil is heated, the heat from the oil is transmitted from the protective member 23 of the housing 20 to the housing body 25 and the mount portion 35. Are sequentially transmitted to the support member 43. In the present embodiment, the second substrate 80 is held in the groove 41 of the mount portion 35 on the distal end side in the axial direction da, and is fixed to the support member 43 on the proximal end side in the axial direction da. Further, the support member 43 is spaced from the second substrate 80 in a direction perpendicular to the axial direction da (the normal direction of the second support plate portion 81), and the second support plate portion 81, the support member 43, and the like. A space is formed between the two. Thus, since the contact area between the second substrate 80 and the housing 20 and the support member 43 is minimized, the heat from the oil is transferred from the housing 20 and the support member 43 to the second substrate 80. It is possible to suppress the transmission and prevent a problem that the electronic components and the like of the second substrate 80 are deteriorated by heat.

  As shown in FIG. 1, in a state where the sensor 10 is attached to the pipe 101, the connection portion between the housing body 25 and the cover 45 is located outside the pipe 101. Therefore, the cover 45 can be removed from the casing body 25 with the casing body 25 fixed to the pipe 101, in other words, with the casing body 25 blocking the holding hole 102 of the pipe 101. Then, by removing the screw 95 with the cover 45 removed, it is possible to remove the first substrate 70 from the housing body 25 and attach the first substrate 70 to the housing body 25. Similarly, it is possible to remove the second substrate 80 from the housing body 25 and attach the second substrate 80 to the housing body 25 with the cover 45 removed. The first substrate 70 and the second substrate 80 are replaced in response to a change in processing in the first circuit 72 or the second circuit 84 due to a failure or addition or change of monitoring conditions.

  In particular, in the present embodiment, the circuit included in the sensor 10 is divided into a first circuit 72 and a second circuit 84. Therefore, it is only necessary to replace the substrate including the circuit that needs to be replaced, and the cost associated with the replacement can be reduced. In addition, in the present embodiment, the first substrate 70 or the second substrate 80 can be replaced with the housing body 25 closing the holding hole 102 of the pipe 101. Therefore, it is not necessary to extract oil from the piping 101 and refill the oil into the piping 101. On the other hand, when using a sensor whose circuit is not removable from the housing, after removing the oil from the pipe, remove the sensor from the pipe and install a new sensor on the pipe. Will be refilled. Therefore, according to the present embodiment, it is possible to greatly reduce the work and cost associated with circuit replacement.

  As described above, in the present embodiment, the sensor 10 includes the detection element 60, the first substrate 70 electrically connected to the detection element 60, and the second substrate electrically connected to the first substrate 70. 80. That is, a circuit used in combination with the detection element 60 is mounted separately on the first substrate 70 and the second substrate 80. A part of the circuit incorporated in the sensor 10 and electrically connected to the detection element 60 can be used in common without depending on the monitoring item or monitoring target of the sensor 10. Therefore, one of the first substrate 70 and the second substrate 80 can be used in common between the sensors 10 having different monitoring items and monitoring targets. According to the present embodiment as described above, it is possible to provide an appropriate sensor 10 according to a monitoring item or a monitoring target at a low cost.

  In the present embodiment, the detection unit 50 is detachably connected to the first substrate 70. Therefore, an appropriate combination of the detection element 60 and the first substrate 70 can be easily prepared according to the monitoring item of the sensor 10 and the monitoring target.

  In the present embodiment, the sensor 10 has a connector 91 that is electrically connected to both the first substrate 70 and the second substrate 80, and the connector 91 is connected to the first substrate 70 and the second substrate 80. It is detachably connected to at least one. Therefore, an appropriate combination of the first substrate 70 and the second substrate 80 can be easily prepared according to the monitoring item and the monitoring target of the sensor 10.

  In the present embodiment, the sensor 10 further includes a housing 20 that holds the detection unit 50, the first substrate 70, and the second substrate 80. At least one of the detection unit 50, the first substrate 70, and the second substrate 80 is detachable from the housing 20. Therefore, the detection unit 50, the first substrate 70, and the second substrate 80 are replaced according to the monitoring item and the monitoring target of the sensor 10 by appropriately replacing the components that can be attached to and detached from the housing 20 and incorporating them into the housing 20. Can be combined appropriately. Further, for example, during maintenance of the sensor 10 or the apparatus 100 to which the sensor 10 is attached, at least one or more of the detection unit 50, the first substrate 70, and the second substrate 80 that can be attached to and detached from the housing 20 is provided. Can be easily replaced.

  In the present embodiment, the housing 20 includes a housing body 25 that holds the detection unit 50 on one side (tip side) in one direction (axial direction da) and the other side (base) in one direction (axial direction da). And a cover 45 that is detachably attached to the housing body 25 from the end side. The housing body 25 has a mounting engagement portion 31 used for mounting the sensor 10 between a portion 35 where the cover 45 is mounted along the one direction da and a portion 32 holding the detection unit 50. doing. Then, at least one of the first substrate 70 and the second substrate 80 can be removed from the housing body 25 with the cover 45 removed from the housing body 25. That is, it is possible to remove the cover 45 from the casing body 25 while the casing body 25 is attached to the apparatus 100 that holds the oil or the like to be monitored. Then, at least one of the first substrate 70 and the second substrate 80 can be exchanged from the housing body 25 that remains attached to the device that holds oil or the like. During the replacement work, the casing body 25 can remain attached to the apparatus, and in this case, no oil flows out from the portion 102 of the apparatus 100 that holds the casing body 25. In other words, it is possible to easily and quickly remove at least one of the first substrate 70 and the second substrate 80 by avoiding operations such as oil extraction from the device 100 to which the sensor 10 is attached and oil refilling into the device 100. Can be exchanged.

  In the present embodiment, a portion of the second substrate 80 located on one side (tip side) in one direction (axial direction da) is detachably held by the housing body 25. The second substrate 80 extends from the housing body 25 to the space in the cover 45 to the other side (base end side) in one direction da. That is, the second substrate 80 is exposed from the housing body 25 with the cover 45 removed from the housing body 25. Therefore, replacement of the second substrate 80 can be performed easily and in a short time.

  In the present embodiment, the housing main body 25 extends in one direction (axial direction da) and holds the detection unit 50 on the other side (base end side) in one direction of the shaft-like part 30. And a mount portion 35 that is positioned and thicker than the shaft-shaped portion 30. The mount portion 35 holds a portion located on one side (tip side) of the second substrate 80. A peripheral edge portion 47 that forms an opening located on one side (front end side) in one direction da of the cover 45 is detachably mounted around the mount portion 35. According to such a configuration, the second substrate 80 can be more greatly exposed from the housing body 25 with the cover 45 removed from the housing body 25. Thereby, the second substrate 80 can be replaced more easily and in a shorter time.

  In the present embodiment, the mount portion 35 has a groove 41 that extends linearly in one direction (axial direction da) and opens to the other side (base end side) in one direction. A side edge 80 a of the second substrate 80 is detachably inserted into the groove 41 of the mount portion 35. Therefore, the attachment of the second substrate 80 to the housing body 25 and the removal of the second substrate 80 from the housing body 25 can be performed very easily and in a short time. Further, for example, the temperature of the housing 20 may change due to heat transfer from oil or the like to be monitored, and further, it may be expected that the temperature condition changes in the internal space 21 of the housing 20. As the environmental conditions change, the temperature distribution of the second substrate 80 becomes non-uniform and thermal stress is generated in the second substrate 80, and the second substrate 80 is deformed such as warping due to the thermal stress. Will be. In this regard, according to the present embodiment, the second substrate 80 can be stably held at a predetermined position in the housing 20 by the engagement between the groove 41 and the side edge 80a. In particular, in the illustrated example, a pair of grooves 41 is formed in the mount portion 35, and both side edges 80 a of the second substrate 80 are held by the mount portion 35. Therefore, the second substrate 80 can be more stably held by the housing body 25. As a result, deformation of the second substrate 80 can be effectively prevented, and damage to the second circuit 84 due to deformation of the second substrate 80 can be effectively prevented. Thereby, the reliability of the operation of the sensor 10 can be improved.

  In the present embodiment, the housing body 25 has an accommodation space 26 that opens to the other side (base end side) in one direction (axial direction da), and the accommodation space 26 is at least of the first substrate 70. A part can be accommodated. The first substrate 70 is removably held in the housing body 25 by being inserted into the housing space 26 of the housing body 25 from the other side to the one side (tip side) along one direction da. . That is, the replacement of the first substrate 70 can be performed in a short time by an easy operation.

  In the present embodiment, a part of the first substrate 70 located on the other side (base end side) in one direction (axial direction da) in a state where the first substrate 70 is held by the casing body 25 It extends from the body body 25 to the space in the cover 45 to the other side (base end side) in one direction da. That is, the first substrate 70 is exposed from the housing body 25 with the cover 45 removed from the housing body 25. Therefore, the replacement of the second substrate 80 can be performed more easily and in a shorter time.

  In the present embodiment, the detection unit 50 includes a terminal portion 52 that is electrically connected to the detection element 60 and extends to the other side (base end side) along one direction (axial direction da) into the accommodation space 26. Have. On the other hand, the first substrate 70 has a terminal portion 73 that is electrically connected to the terminal portion 52 of the detection unit 50. And the terminal part 73 of the 1st board | substrate 70 and the terminal part 52 of the detection unit 50 are accommodation space of the housing main body 25 from one side (base end side) to one side (front end side) along one direction da. By inserting the first substrate 70 into the H. 26, it is possible to automatically connect electrically. Further, the electrical connection between the terminal portion 73 of the first substrate 70 and the terminal portion 52 of the detection unit 50 is a housing from one side (front end side) to the other side (base end side) along one direction da. By automatically pulling out the first substrate 70 from the accommodation space 26 of the main body 25, the release is automatically performed. Therefore, the replacement of the second substrate 70 can be performed in a short time by a very simple operation.

  Various modifications can be made to the above-described embodiment. Hereinafter, an example of modification will be described. In the following description, for parts that can be configured in the same manner as in the above-described embodiment, the same reference numerals as those used for the corresponding parts in the above-described embodiment are used, and redundant description is omitted. .

  In the above-described embodiment, the example in which the detection unit 50, the first substrate 70, and the second substrate 80 are all detachable from the housing 20 has been described. However, the present invention is not limited to this example. One or more of the detection unit 50, the first substrate 70, and the second substrate 80 may be fixed to the housing 20. In addition, when one of the first substrate 70 and the second substrate 80 is fixed to the housing 20, the substrate including a highly versatile circuit can be replaced with the less versatile substrate to which the housing 20 is fixed. It is preferable that

  In the above-described embodiment, the example in which both ends of the first connector 91 are detachable has been shown. However, the present invention is not limited to this example, and one end of the first connector 91 is connected to the first connector terminal. 86 or the connector terminal 74 may be fixed. In the above-described embodiment, the example in which both ends of the second connector 92 are detachable is shown. However, the present invention is not limited to this example, and one end of the second connector 92 is connected to the second connector terminal. 87 or the connecting portion 46 may be fixed.

  Further, in the above-described embodiment, the example in which the sensor 10 is fixedly mounted on the apparatus 100 that is the mounted body has been described. However, the sensor 10 may measure the characteristics of the fluid to be measured by other modes. For example, the measurement may be performed by inserting the sensor 10 into the fluid to be monitored while the user grips the sensor 10 by hand, or the measurement may be performed by using a fluid sample collected from a pipeline or a tank.

  Further, in the above-described embodiment, an example in which oil or the like is used as a monitoring target fluid has been described. However, a fluid other than oil may be used as a monitoring target, and a sensor that detects characteristics of any liquid (such as liquid and sol) and gas The present invention can be applied to. Examples of the liquid monitoring target include drainage, food and drink, medicine, river water, seawater, ink, detergent, and optical modeling agent.

  Furthermore, although the above-mentioned embodiment demonstrated the example which uses a moisture content as a monitoring item, it is good also as a monitoring item which should measure the characteristics of fluids other than a moisture content. The detection element 60 may detect, for example, the pressure, temperature, flow rate, liquid level, or flow rate of the fluid, or detect the presence or absence of a specific contained substance or the concentration of the contained substance in the fluid. It may also be one that detects and identifies contained substances in the fluid.

  Further, the detection method of the detection element 60 may be a method other than the electrostatic capacitance type. For example, a detection element having an optical element or a heat conduction type detection element may be used as the detection element 60. However, the detection method of the detection element 60 is preferably selected as an appropriate method according to the fluid to be monitored and the type of monitoring item. In addition, it is preferable that the configuration and material of the detection element 60 are selected appropriately depending on the fluid to be monitored and the type of monitoring item.

  In addition, although the some modification with respect to embodiment mentioned above was demonstrated above, naturally, it is also possible to apply combining several modifications suitably.

DESCRIPTION OF SYMBOLS 10 Sensor 20 Housing | casing 21 Internal space 22 Opening 23 Protection member 24 Communication hole 25 Housing | casing main body 26 Housing space 27 Screw 30 Shaft-shaped part 31 Attachment part 32 Attachment part 33 Nut part 35 Mount part 36 Step part 37 Screw hole 38 Sealing member 40 Indentation 41 Groove 43 Support member 45 Cover 46 Connection portion 47 Peripheral portion 48 Screw receiving hole 50 Detection unit 51 Holding base 52 Terminal portion 53 Sealing member 60 Detection element 61 Support plate portion 62 First electrode 63 second electrode 64 sensitive film 66 first terminal 67 second terminal 70 first substrate 71 first support plate portion 72 first circuit 73 terminal portion 74 connector terminal 80 second substrate 80a side edge 81 second support plate portion 82 auxiliary Support plate portion 83 Connection member 84 Second circuit 85 Lamp 86 First connector terminal 87 Second connector terminal 88 Third connector terminal 91 First connector 9 The second connector 93 third connector 95 screws 100 101 piping 102 holding hole

Claims (11)

A detection unit including a detection element;
A first substrate electrically connected to the detection element;
And a second substrate electrically connected to the first substrate.   The sensor according to claim 1, wherein the detection unit is detachable from the first substrate. A connector that is electrically connected to both the first substrate and the second substrate;
The sensor according to claim 1, wherein the connector is detachable from at least one of the first substrate and the second substrate. A housing that holds the detection unit, the first substrate, and the second substrate;
The sensor according to claim 1, wherein at least one of the detection unit, the first substrate, and the second substrate is detachable from the housing. The housing includes a housing body that holds the detection unit on one side in one direction, and a cover that is detachably attached to the housing body from the other side in the one direction.
The housing body has a mounting engagement portion used for mounting the sensor between a portion where the cover along the one direction is mounted and a portion holding the detection unit.
5. The sensor according to claim 4, wherein at least one of the first substrate and the second substrate is removable from the housing body in a state where the cover is removed from the housing body. The housing includes a housing body that holds the detection unit on one side in one direction, and a cover that is detachably attached to the housing body from the other side in the one direction.
A part of the second substrate located on the one side in the one direction is detachably held by the casing body, and extends from the casing body to the space in the cover to the other side in the one direction. The sensor according to claim 4, wherein the sensor is exposed. The housing main body extends in the one direction to hold the detection unit, a mount portion positioned on the other side of the shaft-like portion in the one direction and thicker than the shaft-shaped portion, Have
The mount portion holds the portion located on the one side of the second substrate;
The sensor according to claim 6, wherein a peripheral edge portion forming an opening located on the one side in the one direction of the cover is detachably held around the mount portion. The mount portion has a groove extending linearly in the one direction and opened to the other side in the one direction;
The sensor according to claim 7, wherein a side edge of the second substrate is removably inserted into the groove of the mount portion. The housing includes a housing body that holds the detection unit on one side in one direction, and a cover that is detachably attached to the housing body from the other side in the one direction.
The housing body is a housing space opened to the other side in the one direction, and has a housing space capable of housing at least a part of the first substrate,
The first substrate is detachably held in the housing body by being inserted into the housing space of the housing body from the other side toward the one side along the one direction. Item 9. The sensor according to any one of Items 4 to 8.   In a state where the first substrate is held by the housing main body, a part of the first substrate located on the other side in the one direction extends from the housing main body to the space in the cover in the one direction. The sensor according to claim 9, which extends to the other side. The detection unit has a terminal portion that is electrically connected to the detection element and located in the accommodation space;
The first substrate has a terminal portion that is electrically connected to the terminal portion of the detection unit;
The terminal portion of the first substrate and the terminal portion of the detection unit are inserted into the housing space of the housing body from the other side toward the one side along the one direction. The sensor according to claim 9 or 10, wherein the sensor is automatically electrically connected.

Images