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Catalytic combustion sensor and dynamic balance measuring method thereof

A catalytic combustion and dynamic balance technology, applied in measuring devices, chemical analysis by combustion, chemical analysis by catalysis, etc., can solve the problem of limited amount of catalyst, low service life and anti-poisoning performance, and susceptibility to environmental temperature and humidity and other issues to achieve the effects of reducing power consumption, prolonging service life, and accurate measurement results

Pending Publication Date: 2020-01-21
盟莆安电子(上海)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they have their own limitations. For example, non-dispersive infrared sensors only respond to combustible gases with specific infrared absorption wavelengths; semiconductor gas sensors are extremely susceptible to environmental temperature and humidity; MEMS principle sensing elements have limited catalysts, service life and anti-poisoning poor performance

Method used

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  • Catalytic combustion sensor and dynamic balance measuring method thereof
  • Catalytic combustion sensor and dynamic balance measuring method thereof
  • Catalytic combustion sensor and dynamic balance measuring method thereof

Examples

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Embodiment 1

[0035] see Figure 1-2 As shown, a catalytic combustion sensor of the present invention comprises an explosion-proof stainless steel casing 4, a catalytic combustion compensating element 1 and a catalytic combustion detection element 2 are installed in the explosion-proof stainless steel casing 4, and the outer top surface of the explosion-proof stainless steel casing 4 is provided with a surface evenly distributed The metal sintered sheet 5 with pores is opened, and three signal pins 3 are installed on the bottom of the explosion-proof stainless steel shell 4. The gas enters the sensor through the pores of the metal sintered sheet 5 on the top, and reacts on the detection element, and the signal on the signal pin 3 pin output;

[0036] A circuit board is installed on the inner bottom of the explosion-proof stainless steel shell 4, and a Wheatstone bridge 6 is arranged on the circuit board. The catalytic combustion compensation element 1 and the catalytic combustion detection ...

Embodiment 2

[0052] Its main structure is consistent with embodiment 1;

[0053] Wherein, the fixed input voltage terminal 10 adopts a fixed voltage power supply with an input voltage of 5V.

[0054] Wherein, the controllable switch 7 adopts a relay.

[0055] Such as Figure 3-4 Shown, a kind of dynamic balance measuring method of catalytic combustion sensor, its steps are consistent with embodiment 1.

[0056] Wherein, the value of t1 is 800ms.

[0057] Wherein, the value of the detection period T is 8000ms.

[0058] Advantages of the present invention: the present invention calculates the concentration of gas by detecting the change rate of the sensor signal, adopts a new dynamic balance method to measure the concentration of combustible gas, periodically supplies power to the detection element, and uses the Wheatstone bridge balance circuit to measure the concentration of combustible gas. The output signal is different from the output level of the usual detection bridge. According t...

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Abstract

The invention discloses a catalytic combustion sensor and a dynamic balance measuring method thereof, and relates to the technical field of catalytic combustion sensors. The sensor comprises an explosion-proof stainless steel housing, wherein a catalytic combustion compensation element and a catalytic combustion detection element are mounted in the explosion-proof stainless steel housing; a Wheatstone bridge is arranged on a circuit board; the output end of the Wheatstone bridge is connected with an amplifier; the amplifier is connected with an MCU after signal amplification; ADC conversion iscarried out through ADCInput arranged in the MCU; then data acquisition is carried out; the MCU controls a controllable switch to be connected to a fixed input voltage end; and the MCU periodically and delay controls the power-on time of the circuit. The sensor can work intermittently, continuous power supply is not needed, the power consumption of the sensor is effectively reduced, the service life of the sensor is prolonged, and the measurement result of the combustor is accurate.

Description

technical field [0001] The invention belongs to the technical field of catalytic combustion sensors, in particular to a catalytic combustion sensor and a dynamic balance measurement method of the catalytic combustion sensor. Background technique [0002] Catalytic combustion sensor is one of the earliest applied gas sensors. Its basic working principle is: combustible gas burns without flame under the action of the carrier surface of the detection element and the catalyst, the temperature of the carrier increases, and the internal resistance value also increases accordingly. The value change is proportional to the combustible gas concentration. The concentration of flammable gas can be calculated by measuring the change of resistance value, or the change of current and voltage caused by the change of resistance value. Catalytic combustion sensors are mainly used for the detection of flammable gases. They have good output signal linearity, stable performance, low price, and ...

Claims

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Application Information

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IPC IPC(8): G01N27/16G01N31/10G01N31/12
CPCG01N27/045G01N27/16G01N31/10G01N31/12
Inventor 杭益青齐宝玲
Owner 盟莆安电子(上海)有限公司
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