CN213957427U - Waterproof type multichannel online conductivity detection sensor with shielding device - Google Patents

Abstract

The utility model relates to an online conductivity detection sensor of waterproof type multichannel with shield assembly, including shield assembly and a plurality of waterproof type conductivity detection sensors of setting in shield assembly, shield assembly include array passageway frid and apron, every waterproof type conductivity detection sensor places respectively in array passageway frid to through apron locking, conductivity detection sensor include conductivity detecting element and sensor housing, every conductivity detecting element sets up respectively in the sensor housing that has the isolation tank. Compared with the prior art, the utility model provides a waterproof and multichannel conductivity detection sensor channel of conductivity detection sensor disturb and external signal interference problem, have dampproofing, waterproof, grease proofing, dust resistance and easy operation's advantage.

Description

Waterproof type multichannel online conductivity detection sensor with shielding device

Technical Field

The utility model belongs to the technical field of the waterproof design of sensor and shielding technique and specifically relates to a waterproof type multichannel online conductivity detection sensor with shield assembly is related to.

Background

The capacitive coupling type non-contact conductance detection includes exciting electrode and receiving electrode, which are axially arranged outside the capillary or micro channel. When the alternating current signal of the excitation electrode is coupled into the solution through the wall of the insulated pipe, a signal reflecting the ion concentration of the solution can be obtained at the receiving electrode. It has the advantages of high sensitivity, small volume, low cost, non-contact, etc. and is developed fast in capillary electrophoresis and microchip electrophoresis.

Factors influencing the capacitive coupling type non-contact conductivity detection are as follows:

1, the direct coupling of signals between the excitation electrode and the receiving electrode. When the distance between the excitation electrode and the receiving electrode is small, the capacitance formed by the two electrodes cannot be ignored, and the excitation signal is directly coupled to the receiving electrode through the capacitance, so that the voltage detection module has larger signal output even for ultrapure water with small conductivity, which is called as large initial value of output. The large output initial value not only affects the sensitivity of the sensor, but also greatly reduces the measuring range of the sensor, and the existing better solution to the problem is to add a shielding unit between the exciting electrode and the receiving electrode and to ground, so that the shielding unit forms capacitance to ground with the exciting electrode and the receiving electrode respectively, and the influence of direct coupling of the exciting electrode and the receiving electrode is eliminated.

External signal effects, such sensors in current single channel capillary electrophoresis and microchip electrophoresis employ integral placement of the excitation and receive electrodes in a shielded cartridge to reduce such effects, but there is no shielding method and apparatus involved for multi-channel conductivity detection sensors.

The influence of environmental factors, including temperature and humidity, the influence of temperature can adopt temperature compensation data to revise, and this patent does not consider, because be capacitive coupling, when the electrode is located the environmental humidity change, especially in some application occasions, if when the solution that is surveyed is sputter carelessly or is stayed the electrode zone along the pipeline outer wall during the detection operation, voltage detection module output signal all can change, directly leads to amplifier output signal saturation even, seriously influences the detection and the application of this type of sensor.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a waterproof type multichannel online conductivity detection sensor with shield assembly in order to overcome the defect that above-mentioned prior art exists.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides an online conductivity detection sensor of waterproof type multichannel with shield assembly, includes shield assembly and a plurality of waterproof type conductivity detection sensors of setting in shield assembly, shield assembly include array passageway frid and apron, every waterproof type conductivity detection sensor places respectively in array passageway frid to through the apron locking, waterproof type conductivity detection sensor include conductivity detecting element and sensor housing, every conductivity detecting element sets up respectively in the sensor housing that has the isolation tank.

Preferably, the sensor housing is an insulating housing.

Preferably, the waterproof conductivity detection sensor is composed of an insulating pipeline and two electrodes respectively wound on the insulating pipeline.

Preferably, two grooves for placing electrodes are arranged in the sensor housing, and an electrode lead-out wire of each electrode is led out through a lead-out wire hole arranged at the bottom of the sensor housing.

Preferably, the array channel groove plate is composed of isolation grooves with the same number as the channels of the conductivity detection sensors, outlet holes of the waterproof conductivity detection sensors arranged at the bottoms of the isolation grooves, outlet holes of the insulated pipelines of the conductivity detection units and fixing threaded holes of the channel groove plate.

Preferably, the corresponding position of the cover plate is provided with a fixing hole matched with the array channel groove plate.

Preferably, the array type channel groove plate and the cover plate are both made of metal conductive materials.

Preferably, the waterproof conductivity detection sensor is respectively placed in each isolation groove of the array type channel groove plate, and after the isolation grooves are filled with waterproof glue for sealing and fixing, the cover plate is covered and locked by screws.

Preferably, the screw is connected with the ground of an external detection circuit to shield the multi-channel conductivity detection sensor from inter-channel interference and external signal interference.

Preferably, the waterproof glue is low-temperature or normal-temperature curing waterproof glue.

Compared with the prior art, the utility model has the advantages of it is following:

the utility model discloses mainly solved electric conductance detection sensor's waterproof and multichannel electric conductance detection sensor passageway interference and external signal interference problem between, electric conductance detection sensor has fine dampproofing, waterproof, grease-proof, dustproof performance, and multichannel electric conductance detection sensor's shield assembly easy operation, anti passageway between with the external signal interference performance good.

Drawings

Fig. 1 is a schematic structural diagram of a separation type multi-channel conductivity detection sensor.

Fig. 2 is a schematic structural diagram of an integrated multi-channel conductance detection sensor, wherein fig. 2a is a schematic structural diagram of a front side, and fig. 2b is a schematic structural diagram of a back side.

FIG. 3 is a graph showing the results of the test in example 1 with and without shielding

Fig. 4 is a schematic structural diagram of a separated waterproof conductivity detection sensor, where fig. 4a is a schematic structural diagram of a conductivity detection unit, and fig. 4b is a schematic structural diagram of a sensor housing.

Fig. 5 is a schematic structural view of the integrated waterproof conductivity detection sensor, wherein fig. 5a is a schematic structural view of a front side, and fig. 5b is a schematic structural view of a side.

Fig. 6 is a graph showing the test results of the conductivity detection sensor with or without the waterproof measure.

The notation in the figure is:

1. waterproof type conductivity detection sensor, 2, array type passageway frid, 3, apron, 1.1, conductance detecting element, 1.1.1, insulating tube, 1.1.2, electrode, 1.1.3, electrode lead-out wire, 1.2, sensor housing, 1.2.1, groove, 1.2.2, lead-out wire hole, 2.1, isolation groove, 2.2, lead-out wire hole, 2.3, insulating tube outlet groove, 2.4, passageway frid fixed screw hole, 3.1, apron fixed orifices.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example 1

The structure schematics of the separation and integral multi-channel conductivity detection sensor are respectively shown in fig. 1 and fig. 2, the shielding device comprises an array type channel groove plate 2 and a cover plate 3, a waterproof conductivity detection sensor 1 is respectively arranged in each channel groove 2.1 of the array type channel groove plate 2, an insulated pipeline 1.1.1 of the conductivity detection sensor 1 extends out from an insulated pipeline outlet hole groove 2.3 of the array type channel groove plate 2, a sensor lead extends out from an outgoing line hole 2.2 at the bottom of the channel groove 2.1, and then the cover plate 3 is covered and locked by screws through a cover plate fixing hole 3.1 and a channel groove plate fixing threaded hole 2.4.

The shielding device mainly plays a role in shielding interference between channels and external signal interference, after the array channel groove plate 2 and the cover plate 3 are installed, the conductivity detection unit 1.1 of each channel sensor is sealed in respective independent space, only the insulating pipeline 1.1.1 extends out from two ends, therefore, the array channel groove plate 2 and the cover plate 3 are made of metal materials (in the example, metal aluminum), and are connected with the ground of an external detection circuit module through locking screws, and the effect of shielding interference between channels and external signal interference is achieved. Fig. 3 shows a graph of the test results with and without shielding. As can be seen from the figure, when there is no shielding, the sensor output is greatly affected by static electricity of external signals, other electrical signals, and the like, and a jump occurs in the output result. When the shielding exists, the same external signal is used for interference, and the output is kept unchanged.

The separated and integrated waterproof conductivity detection sensor 1 is shown in fig. 4 and fig. 5, respectively, and comprises a conductivity detection unit 1.1, a sensor housing 1.2 and waterproof glue, wherein the conductivity detection unit 1.1 comprises an insulating pipeline 1.1.1, an electrode 1.1.2 and an electrode lead-out wire 1.1.3, the conductivity detection unit 1.1 is placed in the sensor housing 1.2 with a groove 1.2.1, and the groove 1.2.1 is filled with the waterproof glue for sealing and fixing, so that the waterproof glue fills the whole groove 1.2.1 and smoothes the top surface of the groove, and the electrode lead-out wire 1.1.3 extends out of a lead-out wire hole 1.2.2 at the bottom in the sensor housing 1.2.

The insulating conduit 1.1.1 of the waterproof conductivity detection sensor 1 is a Peek tube, the electrode 1.1.2 is wound by a copper foil adhesive tape, the sensor housing 1.2 is made of ABS engineering plastic, and in order to reduce the manufacturing difficulty and reduce the manufacturing time, the waterproof adhesive is required to be cured at low temperature or normal temperature, the curing speed is high, the bonding strength after curing is high, the hardness is good, and the waterproof adhesive has good electrical and physical properties such as insulation, compression resistance and the like, and the waterproof adhesive used in the embodiment is epoxy resin AB adhesive. Fig. 6 is a graph showing the test results of the conductivity detection sensor with or without the waterproofing measure. It can be known from the figure that when the liquid to be detected is splashed on the sensor electrode, the output result of the sensor without the waterproof measure jumps until the signal is saturated, and then the output result of the sensor is gradually recovered along with the gradual drying of the splashed liquid, and when the waterproof measure is provided, the output result of the sensor is not influenced even if the sensor is soaked in the liquid.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. The utility model provides an online conductivity detection sensor of waterproof type multichannel with shield assembly, its characterized in that, includes shield assembly and a plurality of waterproof type conductivity detection sensor (1) of setting in shield assembly, shield assembly include array passageway frid (2) and apron (3), every waterproof type conductivity detection sensor (1) is placed respectively in array passageway frid (2) to through apron (3) locking, waterproof type conductivity detection sensor (1) including conductivity detection unit (1.1) and sensor housing (1.2), every conductivity detection unit (1.1) sets up respectively in sensor housing (1.2) that have isolation tank (2.1).

2. The sensor with the shielding device for the multi-channel online conductivity detection of the water-proof type according to claim 1, wherein the sensor housing (1.2) is an insulating housing.

3. The sensor with the shielding device for the multi-channel online conductivity detection of the water-proof type according to claim 1, wherein the sensor (1) is composed of an insulating pipeline (1.1.1) and two electrodes (1.1.2) respectively wound on the insulating pipeline (1.1.1).

4. The waterproof multichannel online conductivity detection sensor with the shielding device according to claim 3, wherein the sensor housing (1.2) is provided with two grooves (1.2.1) for placing the electrodes (1.1.2), and the electrode lead (1.1.3) of each electrode (1.1.2) is led out through a lead-out hole (1.2.2) formed at the bottom of the sensor housing (1.2).

5. The waterproof multichannel online conductivity detection sensor with the shielding device according to claim 1, wherein the array type channel groove plate (2) is composed of isolation grooves (2.1) with the same number as the channels of the conductivity detection sensor, outgoing line holes (2.2) of the waterproof conductivity detection sensor (1) arranged at the bottom of the isolation grooves (2.1), insulating pipeline outgoing hole grooves (2.3) of the conductivity detection unit (1.1), and channel groove plate fixing threaded holes (2.4).

6. The sensor for detecting the online conductance of the water-proof type multi-channel with the shielding device according to claim 5, wherein the cover plate (3) is provided with fixing holes (3.1) at corresponding positions with those of the arrayed channel trough plate (2).

7. The sensor for detecting the online conductance of the water-proof type with the shielding device according to claim 1, wherein the arrayed channel trough plate (2) and the cover plate (3) are made of metal conductive materials.

8. The on-line conductivity detection sensor with the shielding device of the waterproof type multichannel of claim 1 is characterized in that the waterproof type conductivity detection sensor (1) is respectively placed in each isolation groove (2.1) of the array type channel trough plate (2), and after the isolation grooves (2.1) are filled with waterproof glue for sealing and fixing, the cover plate (3) is covered and locked by screws.

9. The waterproof multi-channel on-line conductivity detection sensor with the shielding device according to claim 8, wherein the screw is connected to the ground of the external detection circuit for shielding the inter-channel interference and the external signal interference of the multi-channel conductivity detection sensor.

10. The sensor of claim 8, wherein the waterproof adhesive is a low-temperature or normal-temperature curing waterproof adhesive.

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