Improved catalytic combustion gas sensor and its gas detection method

Abstract

The invention relates to an improved catalytic combustion gas sensor and a gas detection method thereof. The catalytic combustion gas sensor includes a first resistor, a second resistor and a black element, the first end of the first resistor is connected to a power supply voltage, and the end of the first resistor is connected to a second resistor. The first end of the two resistors, the second resistor end is connected to one end of the black element and the second resistance end is grounded, and it is characterized in that it also includes a sampling element, the head end of the sampling element is connected to the power supply voltage, and the end of the sampling element is connected to the other end of the black element; The resistance value of the sampling element is 1 / N times the resistance value of the thermal resistance of the black element; N>1. By obtaining the preliminary gas concentration value to be detected, the zero drift coefficient and sensitivity drift coefficient of the gas sensor, the compensated gas concentration value is obtained, and then combined with the temperature calibration coefficient and humidity calibration coefficient of the obtained gas sensor, the gas to be detected is obtained after compensation. The final actual concentration value can reduce the adverse effects of temperature and humidity factors in the surrounding environment on the detection results of the gas sensor.

Description

technical field [0001] The invention relates to the field of gas detection, in particular to an improved catalytic combustion gas sensor and a gas detection method thereof. Background technique [0002] Catalytic combustion gas sensor is currently the most widely used detection device for detecting combustible gas. The traditional catalytic combustion gas sensor is a Wheatstone bridge composed of two sensor sensitive elements and two fixed resistors. The two sensor sensitive elements include black elements and white elements. When the mixed gas containing combustible gas and oxygen diffuses to the black element, it will burn quickly without flame and generate reaction heat, which will increase the resistance of the platinum wire resistance, and the bridge will output a changing voltage signal, which is consistent with the combustible gas It is directly proportional to the concentration of the white element and the black element, which have the same resistance value and perf...

AI Technical Summary

Problems solved by technology

Of course, the existing catalytic combustion gas sensors also have some disadvantages. For example, their working current can generally be as high as 100mA or even 300mA, which will cause the overall power consumption of combustible gas detectors to be large, which is not conducive to the existing catalytic combustion gas sensors. A large number of distribution settings for

In addition, the signals output by such catalytic combustion gas sensors are adversely affected by temperature and humidity factors in the external environment, resulting in inaccurate gas concentration data detected by these catalytic combustion gas sensors

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