JP3079882B2 - Temperature compensator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature compensating device, and more particularly to a temperature compensating device for compensating an input temperature signal from a thermocouple in a temperature measuring instrument such as a temperature controller or a temperature indicator. The present invention relates to a temperature compensating device having an improved mounting structure of a temperature compensating element for compensating the temperature.

[0002]

2. Description of the Related Art As a conventional temperature compensator of this type, for example, a configuration as shown in FIG. 7 is known. That is,
A plurality of connection electrodes 3a to 3e are formed at one end (left end in FIG. 7) of a circuit board 1 on which a main body circuit such as a temperature controller is formed, and a plurality of connection electrodes 3a to 3e are provided on a rear end surface of the main body case 5 of the temperature controller. The circuit board 1 is housed in the main body case 5 so that the connection electrodes 3a to 3e are sandwiched between the connection terminal pieces 7a to 7e, and the mounting piece 11 is attached from the circuit board 1 to the vicinity of the connection electrode 3e to which the thermocouple 9 is connected. The temperature compensating element 1 is protruded outside through a communication window (not shown in FIG. 7) of the main body case 5.
A configuration is known in which the mounting piece 11 is held by the mounting piece 11 so as to be exposed to the outside air.

The thermocouple 9 is a temperature sensor that generates a voltage corresponding to the temperature difference between the temperature contact X and the connection terminals 3d and 3e (connection terminal pieces 7d and 7e) as reference contacts, and its element wire or compensation element. Positive connection electrode 3d via conductors 9a and 9b
And the negative connection electrode 3e. Temperature compensation element 1
Reference numeral 3 denotes a resistance bulb, a thermistor, a diode, or the like for measuring the ambient temperature of the connection terminals 3d, 3e.
Is connected to a correction temperature measuring circuit (not shown). The other connection electrodes 3a to 3c of the circuit board 1 and the other connection terminal pieces 7a to 7c of the main body case 5 are used for power connection and operation output, but the connection state is not shown.

In such a temperature controller, the temperature of the object to be measured is input through a thermocouple 9, and the ambient temperature of the connection terminals 3d and 3e (connection terminal pieces 7d and 7e) to which the compensating conductors 9a and 9b are connected is measured. In general, measurement is performed by the compensation element 13, a compensation signal is created by a correction temperature measurement circuit, and the temperature of the measurement target is compensated for by a known method. for that reason,
The temperature compensation element 13 is connected to the connection terminal 3 to which the thermocouple 9 is connected.
d and 3e (connection terminal pieces 7d and 7e) need to accurately and quickly measure a temperature very close to the temperature of the connection itself. However, temperature compensation is performed according to a change in internal heat generation of the main body case 5 due to an individual function of the meter. The position of the element 13 on the mounting piece 11 was changed to enable temperature compensation.

FIG. 8 is a rear view showing the rear end of the main body case 5 of the temperature controller shown in FIG. 7. For example, the eighth and ninth terminals become connection terminal pieces 7d and 7e, and the thermocouple 9 is used. No connection terminal piece is disposed at the 10th terminal, and the connection piece 15 serves as a communication window 15 for communicating between the inside and the outside.
Project from the main body case 5 to the outside, and the temperature compensation element 13 comes into contact with the outside air. However, like the tenth terminal, the arrangement of the connection terminal pieces and the like is omitted and the communication window 15
In addition to the configuration, although not shown, there is also a configuration in which a dedicated window for the temperature compensation element is separately provided.

[0006]

However, in recent temperature measuring instruments such as temperature controllers and temperature indicators, the shape of the entire instrument has been reduced due to the downsizing of parts due to technological advances, and the like. While the number of connection terminal pieces that can be arranged in the main body case 5 tends to be small, the number of connection terminal pieces tends to be large in accordance with the expansion of built-in computer processing functions, and the connection terminals arranged in the main body case The number of pieces is easily short. As described above, in a situation in which it is desired to arrange at least one connection terminal piece in the main body case 5, one connection terminal piece portion may be used to arrange the temperature compensation element 13. Providing a dedicated window for the temperature compensation element 13 was useless from the viewpoint of effective use of the main body case 5.

On the other hand, in a temperature controller, a temperature indicator, or the like in which a plurality of types of thermocouples are scheduled to be connected, if a thermocouple different from the thermocouple adjusted in advance before operation is operated, connection terminal strips or connection terminals are connected. In many cases, the temperature difference between the positive and negative terminals of the terminal is an error factor, so that even if any thermocouple is connected, the specified accuracy can be obtained, for example, temperature compensation on both the positive and negative sides of the thermocouple A configuration in which elements can be arranged has been desired. Further, in a temperature measuring instrument such as a multipoint temperature controller or a multipoint temperature indicator, a plurality of thermocouples can be connected, and a communication window 15 is provided for each temperature compensating element 13.
Alternatively, a dedicated space is required, and the number of connection terminal pieces tends to be increasingly short.

[0008] However, one input to a plurality of thermocouples
There is a configuration in which compensation is performed by the temperature compensating elements 13, but a configuration in which more accurate temperature compensation is obtained has been desired. Also,
The circuit board 1 housed in the main body case 5 also requires the mounting piece 11 for mounting the temperature compensating element 13, so that the design and processing of the circuit board 1 are complicated, resulting in high costs in terms of design and processing. In order to reduce the influence of the internal heat generation of the instrument, a mounting piece 11 is provided at the lower part of the instrument as shown in FIG.
3 must be attached, and this also imposes restrictions on the design of the circuit board 1.

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional drawback, and can accurately and rapidly measure the temperature of a connection terminal fitting (connection terminal piece) to which a thermocouple is connected. An object of the present invention is to provide an inexpensive temperature compensator in which a large number of connection terminal fittings can be easily arranged in a case, and in which the structure, particularly the design and processing of a circuit board, is simple and inexpensive.

[0010]

In order to solve such a problem, a temperature compensating device according to the present invention has a connecting terminal metal fitting to which a thermocouple is externally connected, which is disposed in a main body case to the outside.
Forming at least a part of the temperature measuring instrument and housing the circuit board having the thermocouple connection electrode in its body case, and disposing a temperature compensation element for outputting a temperature signal of the connection terminal fitting on the circuit board, The connection terminal fitting is formed so as to contact both the thermocouple connection electrode and the temperature compensation element.

According to the present invention, the temperature compensating element is arranged on the back surface of the thermocouple connecting electrode on the circuit board, and one open side of the connecting terminal plate in which the connecting terminal fitting is formed in a substantially U-shape is connected to the thermocouple. It is preferable to elastically press against the connection electrode and press the other open side to the temperature compensation element. Further, in the present invention, it is preferable that the temperature compensating element is suppressed to the circuit board by a holding member, and the connection terminal fitting is pressed against the temperature compensating element via the holding member.

Further, according to the present invention, the circuit board is brought into contact with the connection terminal fitting by inserting the end on the thermocouple connection electrode side between both open pieces of the connection terminal fitting. It is also possible to suppress the temperature compensating element with a retaining bracket whose one end is locked to the temperature compensation element. Still further, in the present invention, it is preferable that a bulging slope is provided between the locking end of the circuit board and the holding portion of the temperature compensation element in the holding member.

[0013]

According to the present invention provided with such means, when a circuit board having a thermocouple connecting electrode at an end and having a temperature compensation element disposed therein is housed in a main body case, the circuit board is disposed in the main body case and connected to the thermocouple. The connection terminal fitting comes into contact with both the thermocouple connection electrode and the temperature compensation element. Then, a temperature compensation element is arranged on the circuit board on the back side of the thermocouple connection electrode, the connection terminal fitting is formed by a substantially U-shaped connection terminal plate, and one open side of the connection terminal plate is connected to the thermocouple connection electrode. When it is pressed and the other open side is pressed against the temperature compensating element, it is easy to form the connection terminal fitting that comes into contact with both the thermocouple connecting electrode and the temperature compensating element.

Further, in the configuration in which the temperature compensating element is held down on the circuit board by the holding metal and the connection terminal fitting is pressed against the temperature compensating element via the holding metal, heat from the connecting terminal fitting is transferred to the temperature compensating element. Reliably transmitted to. further,
In the configuration in which the end of the thermocouple connection electrode side is housed so as to be inserted between the open pieces of the connection terminal fittings, and the temperature compensation element is held down by a holding fitting having one end locked to the end of the circuit board, It is easy to fix the metal fitting to the circuit board.

Further, in the configuration in which the swelling slope is provided between the locking end of the circuit board and the holding portion of the temperature compensating element in the holding fitting, the other opening of the connection terminal fitting is opened when the circuit board is stored. The piece is easy to slide the holding bracket.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing one embodiment of a temperature compensation device according to the present invention. In addition, since it is common to arrange a temperature compensating element at the minus connection terminal to which one side of the thermocouple is connected, FIG. 1 shows a cross-sectional view of the minus connection terminal side, but is not limited to this. .

In FIG. 1, a plurality of holding windows 19 are arranged and formed on the rear end side of a main body case 17 formed by molding an insulating synthetic resin into a box shape. The connection terminal fitting 21 as a terminal is fitted and held by the main body case 17, and for example, a row of connection terminal pieces is formed as shown in FIG. Therefore, FIG.
It is easy to understand if it is considered to be a cross section of the communication window 15 portion. As shown in FIGS. 2 and 3, the connection terminal fitting 21 includes a connection terminal plate 23 and a screw 2 with a conductive washer screwed into the connection terminal plate 23.
5, but is not necessarily limited to the screw 25.

The connection terminal plate 23 is formed by bending a conductive strip material having high thermal conductivity and easy processing such as phosphor bronze, beryllium copper alloy, brass, nickel silver, etc. into a U-shape, and has an intermediate piece. 23 a is bent obliquely with respect to the open pieces 23 b and 23 c on both sides, and is fitted into the holding window 19 so that the open pieces 23 b and 23 c on both sides come into contact with the main body case 17. Reference numeral 23d in FIG. 3 denotes a screw hole into which the screw 25 with a washer is screwed. From the open pieces 23b and 23c, locking projections 31a and 31b toward the intermediate piece 23a are cut and raised outward, and a locking step 33 provided on the main body case 17 is provided.
a, 33b to prevent the connection terminal plate 23 from coming off.

The open piece 23b on one side (the right side in FIG. 1) of the connection terminal plate 23 is thinned from the middle and has good spring property, and the tip is bent in a U-shape inward (circuit board side). It is molded and its tip is further curved inward. In addition, there are various methods for thinning the open piece 23b from the middle, and for example, cutting or rolling is suitable. The shape of the open piece 23b is not limited to this, and may be any shape as long as the open piece 23b is in a shape that makes electrical contact with a thermocouple connection electrode 37 described later and allows the circuit board 27 to be easily pulled out.

The other open piece 23c of the connection terminal plate 23 is
It extends slightly outward and has its tip bent outward to press against the inside of the main body case 17. A holding groove 35 is formed in the holding wall 29 facing the holding window 19 of the main body case 17 so that the circuit board 27 fits in and holds the circuit board 27. The holding wall 29 is thick. Circuit board 27
The thermocouple connecting electrode 3 to which one side of the thermocouple 39 is connected is located at a position closer to the end on one side (right side in FIG. 1).
FIG. 1 shows a thermocouple 3 having other connection electrodes.
9, only the thermocouple connection electrode 37 to be connected is shown.

The circuit board 27 includes a temperature measuring circuit for calculating a measured temperature based on a temperature measuring signal from the thermocouple connecting electrode 37, a main body circuit of a temperature measuring instrument such as a temperature controller and a temperature indicator, and a temperature compensating circuit. Although they are formed, they are not a main part of the present invention, and thus are not shown. On the back surface of the circuit board 27 facing the thermocouple connection electrode 37, that is, on the surface facing the surface on which the thermocouple connection electrode 37 is formed, a temperature compensating element that converts the temperature of the connection terminal plate 21 into an electric signal and measures and outputs the signal. 4
1 is fixed near the thermocouple connection electrode 37.

The temperature compensating element 41 is a conventionally known surface-mount type lead-free chip component such as a resistance thermometer, a thermistor, or a diode, or an axial component with a lead. It is connected to the. A holding member 43 is fixed to the circuit board 27 so as to hold the temperature compensation element 41 on the circuit board 27. As shown in FIG. 4 to FIG. 6, this holding member 43 has high thermal conductivity and is easy to process like phosphor bronze, beryllium copper alloy, brass, stainless steel, carbon steel, etc., like the connection terminal plate 23. It is formed by bending both ends in a U-shape from a conductive strip material rich in elasticity.

One (Upper in FIG. 4) small U-shaped portion of the holding member 43 is a hook portion 43a which is engaged with an end portion of the circuit board 27, and the swelling slope 4 extends from the hook portion 43a.
3b, it extends as a suppressing portion 43c of the temperature compensation element 41, and the other large U-shaped bent portion 43d extends through the circuit board 27 to the vicinity of the thermocouple connection electrode 37. Note that the bent portion 43d of the holding member 43 is slightly narrower to facilitate penetration into the circuit board 27, and the narrower portion is not bent in FIGS. 4 and 6.

The circuit board 27 in which the temperature compensating element 41 is suppressed by the holding fitting 43 is connected to the thermocouple connecting electrode 37 by the connecting terminal plate 23.
And press-contact the tip of one of the open pieces 23b,
The other open piece 23 c is held in the holding groove 35 of the holding wall 29 so as to hold the temperature compensation element 41 from above the metal fitting 43. That is, the holding groove 3 of the holding wall 29
5 is held in a state of being sandwiched between the open pieces 23b and 23c of the connection terminal plate 23, and the open piece 23b is connected to the thermocouple connection electrode 37 in combination with the function of suppressing the open piece 23c. It is elastically and electrically pressed.

In this temperature compensation device, the temperature compensation element 41
When the end of the circuit board 27 is pushed into the holding groove 35 of the holding wall 29 with the opening piece 23c facing the other open piece 23c of the connection terminal plate 23, the open piece 23c is And the open piece 23b is electrically connected to the thermocouple connection electrode 37. At that time, the open piece 23c
Is inserted by sliding over the bulging slope 43b of the holding member 43, the temperature compensating element 41 is not excessively pushed by the open piece 23c, and the circuit board 27 is not pressed.
Is easy to push.

When the screw 25 with the washer is loosened and the element wire of the thermocouple 39 is connected and tightened, the temperature signal from the thermocouple 39 is transmitted to the temperature measuring circuit via the connection terminal plate 23 and the thermocouple connection electrode 37. Then, the temperature compensation element 41 outputs the temperature signal of the connection terminal fitting 21 to the temperature compensation circuit, and the temperature compensation operation is performed. Also, if the circuit board 27 is pulled out,
It can be easily removed from the holding wall 29 and the connection terminal plate 23.

As described above, according to the temperature compensating device of the present invention, the connecting terminal fitting 21 having the U-shaped connecting terminal plate 23 for connecting the thermocouple is provided on the main body case 17 and the thermocouple is brought into contact with the connecting terminal fitting 21. The connection electrode 37 is formed on the circuit board 27, and the temperature compensation element 41 is fixed to the back surface of the thermocouple connection electrode 37, and one open piece 23 b of the connection terminal plate 23 is provided.
Is pressed against the thermocouple connecting electrode 37, while the other open piece 23c is pressed against the temperature compensating element 41 on the back surface, so that the temperature compensating element 41 is almost directly connected to the connection terminal fitting 21 to which the thermocouple 39 is connected. The temperature can be measured by contact, and the temperature of the connection terminal fitting 21 can be measured accurately and quickly.

Moreover, since the arrangement portion of the thermocouple connection electrode 37 and the temperature compensating element 41 on the circuit board 27 is shared, it is not necessary to provide a communication window for disposing the temperature compensating element in the main body case 17 unlike the conventional case. As a result, the number of connection terminal fittings (connection terminal pieces) 21 that can be arranged on the main body case 17 can be secured or increased. Since the thermocouple connecting electrode 37 and the temperature compensating element 41 on the circuit board 27 and the connecting terminal fitting 21 are set and the temperature compensating element 41 can be arranged near any connecting terminal fitting 21, any connecting terminal fitting can be provided. Even if the thermocouple 21 is used for connecting a thermocouple, high-precision temperature measurement can be performed. In a temperature controller or a temperature indicator that is planned to connect a plurality of types of thermocouples,
High-precision temperature measurement is possible for any connection terminal fitting 21 to which any thermocouple is connected.

As with the conventional circuit board 27, it is not necessary to consider the influence of heat generation in the instrument as in the prior art, and the connection terminal fitting 21 for thermocouple connection can be arranged at any position. Improved and easy to process. In addition, the temperature compensating element 41 is fixed to the circuit board 27 by the holding member 43, and the temperature compensating element 41 is elastically held by the open piece 23c from above the holding member 43.
The heat from 1 is easily transmitted to the temperature compensation element 41 accurately, and the measurement accuracy is further improved.

Furthermore, since the hook 43a of the holding member 43 is fixed to the circuit board so as to be locked to the end of the circuit board 27, the holding member 43 can be easily attached to the circuit board 27.
Furthermore, a contact portion (43) with the temperature compensating element 41 from the hook portion 43a of the holding member 43 via the bulging slope 43b.
c), when the circuit board 27 is stored, the tip of the open piece 23c is easily slid on the holding bracket 43, and the temperature compensation element 41 is not excessively pushed by the open piece 23c. Is easy to push.

Incidentally, the connection terminal fitting 21 of the temperature compensation device of the present invention is not necessarily limited to the one having the open pieces 23b and 23c and formed in a U-shape, but a thermocouple connection with the circuit board 27 interposed therebetween. Any shape is possible as long as it has a shape that contacts both the electrode 37 and the temperature compensation element 41. However, the connection terminal plate 2 bent and formed in a U-shape as in the above-described embodiment.
The configuration having 3 is simpler and cheaper to mold. Also,
The temperature compensation element 41 according to the present invention is disposed on the same side of the circuit board 27 as the surface on which the thermocouple connection electrode 37 is formed,
Although not shown, a configuration is also possible in which a slit is provided from the tip of the opening piece 23b to divide the tip into two, and one tip piece is brought into contact with the thermocouple connection electrode 37, while the other tip piece is pressed against the temperature compensation element 41 to suppress it. It is possible, and furthermore, the circuit board 2
It is also possible to adopt a configuration in which the open piece 23b or 23c is buried in the inside 7 so as to be press-contactable. However, the arrangement on the back side of the thermocouple connection electrode 37 of the circuit board 27 is better for the thermocouple connection electrode 3.
It is preferable because the configuration near the connection 7 and the connection terminal fitting 21 are simplified.

Further, in the configuration in which the temperature compensating element 41 is disposed on the surface of the circuit board 27 opposite to the surface on which the thermocouple connection electrodes 37 are formed, from the viewpoint of ensuring accurate temperature measurement of the connection terminal fitting 21, It is better to arrange at least a position closer to the connection terminal fitting 21. And the circuit board 27
The present invention also does not require a holding member 43 for holding down the temperature compensating element 41. However, the use of the holding member 43 ensures the support and fixing of the temperature compensating element 41, and the connection is made using a material having good thermal conductivity. The heat from the terminal fitting 21 is easily transmitted to the temperature compensation element 41 accurately, and the measurement accuracy is further improved.

[0033]

As described above, according to the present invention, a connection terminal fitting to which a thermocouple is externally connected is arranged in a main body case, a circuit board having thermocouple connection electrodes is housed in the main body case, and temperature compensation is performed. The element is fixed to the circuit board and the connection terminal fitting is formed so as to contact both the thermocouple connection electrode and the temperature compensation element, so that the temperature compensation element can measure the temperature of the connection terminal fitting almost directly Thus, the temperature of the connection terminal fitting can be measured accurately and quickly. Moreover,
Since the arrangement portion of the thermocouple connection electrode and the temperature compensating element on the circuit board is shared, unnecessary space for disposing the temperature compensating element in the main body case is eliminated, and the number of connection terminal fittings (connection terminal pieces) that can be arranged on the main body case is reduced. In addition to securing or increasing the temperature, high-precision temperature measurement is possible even if an arbitrary connection terminal fitting is used for thermocouple connection. Further, unlike the related art, there is no need to provide a mounting piece for the temperature compensation element on the circuit board, so that there is an advantage that the design and processing of the circuit board are less restricted, and the shape is simple and inexpensive. Then, the temperature compensation element is arranged on the back surface of the thermocouple connection electrode on the circuit board, and one open side of the substantially U-shaped connection terminal plate forming the connection terminal fitting is pressed against the thermocouple connection electrode. In a configuration in which the other open side is pressed against the temperature compensation element, the connection terminal fittings that come into contact with both the thermocouple connection electrode and the temperature compensation element are easily formed, and the configuration is simple and inexpensive from this point as well. . Also,
Fix the temperature compensating element to the circuit board with holding metal,
In the configuration in which the connection terminal fitting is pressed against the temperature compensating element via the holding metal, the heat from the thermocouple connecting electrode is reliably transmitted to the temperature compensating element, and the measurement accuracy and the compensation accuracy become more accurate. Further, the circuit board is housed by inserting the end on the thermocouple connection electrode side between the open pieces of the connection terminal fittings, and the temperature compensation is performed by a holding fitting having one end hooked to the end of the circuit board. In the configuration in which the element is fixed, the holding member is easily fixed to the circuit board, and the assembling efficiency is good. Furthermore, in the configuration in which the swelling slope is provided between the locking end of the circuit board and the holding portion of the temperature compensating element in the holding fitting, the other open piece of the connection terminal fitting is held by the holding fitting when the circuit board is stored. To prevent damage to the temperature compensating element and simplify the storage of the circuit board.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view (a cross section taken along line II in FIG. 2) illustrating an embodiment of a temperature compensating device according to the present invention.

FIG. 2 is a schematic diagram showing a positional relationship among a connection terminal fitting, a holding fitting, and a temperature compensation element in the temperature compensation device of FIG.

FIG. 3 is an exploded perspective view showing a connection terminal fitting in the temperature compensation device of FIG. 1;

FIG. 4 is a front view showing a holding member in the temperature compensating device of FIG. 1;

FIG. 5 is a side view showing a holding member in the temperature compensating device of FIG. 1;

FIG. 6 is a bottom view showing a holding member in the temperature compensating device of FIG. 1;

FIG. 7 is a schematic diagram showing a conventional temperature compensation device.

FIG. 8 is a diagram illustrating a connection state between a conventional temperature compensator and a thermocouple.

[Explanation of symbols]

 1, 27 Circuit board 3a-3e Connection electrode 5, 17 Body case 7a-7e Connection terminal piece 9, 39 Thermocouple 9a, 9b Compensation lead wire 11 Mounting piece 13, 41 Temperature compensation element 15 Communication window 19 Holding window 21 Connection terminal fitting Reference Signs List 23 Connection terminal plate 23a Intermediate piece 23b One open piece 23c The other open piece 25 Screw with washer 29 Holding wall 31a, 31b Locking protrusion 33a, 33b Locking step 35 Holding groove 37 Thermocouple connection electrode 43 Press fitting 43a Hook Part 43b bulging slope 43c suppressing part 43d bending part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 56-148641 (JP, U) JP-A 63-200142 (JP, U) JP-A 2-69735 (JP, U) JP-A 3- 19934 (JP, U) Japanese Utility Model Hei 5-34540 (JP, U) Japanese Utility Model Utility Model 5-59265 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01K 1/00-19 / 00

Claims (5)

(57) [Claims] 1. A main body case, a connection terminal fitting which is disposed to the outside of the main body case and to which a thermocouple is externally connected, and which forms at least a part of a temperature measuring instrument housed in the main body case, A temperature compensating device comprising: a circuit board having a pair connection electrode; and a temperature compensating element arranged on the circuit board and outputting a temperature signal of the connection terminal fitting, wherein the connection terminal fitting is connected to the thermocouple. A temperature compensating device comprising: a device that comes into contact with both an electrode and a temperature compensating element. 2. The temperature compensation element is disposed on a back surface of the thermocouple connection electrode on the circuit board, and the connection terminal fitting is configured such that one open end of a connection terminal plate formed in a substantially U-shape is the thermocouple. 2. The temperature compensating device according to claim 1, wherein the other open side is pressed against the temperature compensating element while being elastically pressed against the connection electrode. 3. The temperature compensating device according to claim 2, wherein the temperature compensating element is held down on the circuit board by a holding metal, and the connection terminal fitting presses the temperature compensating element through the holding metal. . 4. The circuit board is brought into contact with the connection terminal fitting such that an end on the thermocouple connection electrode side is inserted between open pieces of the connection terminal fitting, and one end is attached to the end of the circuit board. The temperature compensating device according to claim 3, wherein the temperature compensating element is suppressed by the locked metal fitting. 5. The temperature compensating device according to claim 4, wherein the holding member has a bulging slope between the locking end of the circuit board and the holding portion of the temperature compensation element.