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An electrochemical gas sensor and its diagnostic method

A gas sensor and gas sensing technology, applied in the direction of material electrochemical variables, instruments, measuring electricity, etc., can solve the problems of long detection time of sensor faults, complex control logic and circuits, and inability to quickly judge faults of electrochemical gas sensors, etc. , to achieve the effects of saving microcontroller resources, short fault detection time, and easy judgment

Active Publication Date: 2020-12-04
SITERWELL ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides an electrochemical gas sensor and its diagnosis method, aiming to solve the problem that the control logic and circuit of the detection structure of the existing electrochemical gas sensor are relatively complicated, the sensor fault detection time is long, and the detection of the electrochemical gas sensor cannot be realized. The problem of rapid fault judgment

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  • An electrochemical gas sensor and its diagnostic method
  • An electrochemical gas sensor and its diagnostic method
  • An electrochemical gas sensor and its diagnostic method

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Experimental program
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Embodiment 1

[0043] Such as figure 1 As shown, this embodiment provides an electrochemical gas sensor, which includes an electrochemical gas sensing unit 2, a first operational amplifier 1A and a second operational amplifier 1B;

[0044] One end of the electrochemical gas sensing unit 2 is connected to the inverting input end of the first operational amplifier 1A, and the other end is respectively connected to the positive input end of the first operational amplifier 1A and the output of the second operational amplifier 1B. terminal connection;

[0045] The positive input terminal of the second operational amplifier 1B is connected to a constant voltage;

[0046] The output terminal of the first operational amplifier 1A is connected with the single-chip microcomputer 3 for measuring the output voltage.

[0047] Apply a test signal for a certain period of time to the positive input end of the first operational amplifier 1A, the output voltage of the electrochemical gas sensing unit 2 is o...

Embodiment 2

[0049] In order to make those skilled in the art better understand the technical scheme of the present application, a specific embodiment is listed below, such as figure 2 As shown, this embodiment provides an electrochemical gas sensor, which includes an electrochemical gas sensing unit U2, a first operational amplifier U1A and a second operational amplifier U1B;

[0050] One end of the electrochemical gas sensing unit U2 is connected to the inverting input end of the first operational amplifier U1A through the third resistor R3, and the other end is connected to the positive input end of the first operational amplifier U1A through the seventh resistor R7;

[0051] The other end of the electrochemical gas sensing unit U2 is also connected to the output end of the second operational amplifier U1B through the sixth resistor R6.

[0052] The positive input terminal of the first operational amplifier U1A is connected to an eighth resistor R8, and a test signal is applied through...

Embodiment 4

[0063] For the above as figure 2 The electrochemical gas sensor proposed in the second embodiment shown, this embodiment provides a diagnostic method for the electrochemical gas sensor, the method includes the following steps:

[0064] Step 101: Apply a test signal for a certain period of time to the positive input terminal of the first operational amplifier U1A through the eighth resistor R8, the single-chip microcomputer U3 detects the output terminal voltage V1 of the first operational amplifier U1A, continues to apply the test signal, and detects the first operational amplifier U1A again. The output terminal voltage V2 of the operational amplifier U1A, the calculated output voltage difference is V3=|V2-V1|;

[0065] Step 102: If the output voltage difference in the output waveform of the electrochemical gas sensing unit is greater than the preset value V3>a, it is judged that the gas sensor is normal; if the output voltage difference is less than the preset value V3

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Abstract

The invention relates to the field of electrical equipment, and provides an electrochemical gas sensor and a diagnostic method thereof. The electrochemical gas sensor comprises an electrochemical gassensing unit, a first operational amplifier and a second operational amplifier. The one end of the electrochemical gas sensing unit is connected with the reverse input end of the first operational amplifier, and the other end of the electrochemical gas sensing unit is connected with the forward input end of the first operational amplifier and the output end of the second operational amplifier correspondingly. The forward input end of the second operational amplifier is connected with a constant voltage, and the output end of the first operational amplifier is connected with a single chip microcomputer used for measuring the output voltage. According to the electrochemical gas sensor and the diagnostic method thereof, a test signal for a certain time is continuously applied to a secondary operational amplifier circuit composed of the first operational amplifier and the second operational amplifier, the output voltage of the secondary operational amplifier circuit is continuously measured through the single chip microcomputer, the gas sensor is judged to be normal by measuring whether the difference of the predetermined voltage exists or not in output waveform of the gas sensor, thecircuit structure is simple, and the fault detection time of the sensor is short.

Description

technical field [0001] The invention belongs to the field of electrical equipment, in particular to an electrochemical gas sensor and a diagnosis method thereof. Background technique [0002] The gas sensor is the core of the gas detection system and is usually installed in the detection head. In essence, a gas sensor is a converter that converts a certain gas volume fraction into a corresponding electrical signal. The probe head conditions the gas sample through the gas sensor, which usually includes filtering out impurities and interfering gases, drying or refrigeration treatment, sample suction, and even chemical treatment of the sample for faster measurement by the chemical sensor. [0003] The control logic and circuit of the detection structure of the existing electrochemical gas sensor are relatively complicated, and the sensor fault detection time is long, so it is impossible to quickly judge the fault of the electrochemical gas sensor. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/26G01R31/28
CPCG01N27/26G01R31/2829
Inventor 王健吴书江
Owner SITERWELL ELECTRONICS CO LTD
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