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MEMS CO Sensor GM-702B

Summary:

MEMS carbon monoxide gas sensor is using MEMS micro-fabrication hot plate on a Si substrate base, gas-sensitive materials used in the clean air with low conductivity metal oxide semiconductor material. When the sensor exposed to gas atmosphere, the conductivity is changing as the detected gas concentration in the air. The higher the concentration of the gas, the higher the conductivity. Use simple circuit can convert the change of conductivity of the gas concentration corresponding to the output signal.

Feature:

* MEMS technology

* Strong structure

* Low power consumption

* High sensitivity to CO gas

* Fast response and resume

* Simple drive circuit

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APPLICATION

CO Alarm

In daily life, coal, charcoal, and liquefied petroleum gas will produce carbon dioxide after combustion, and carbon dioxide will be reduced to CO in a poorly ventilated environment. CO is a suffocating poison gas, which is colorless, odorless, and non-irritating. If CO leaks, it cannot be discerned by the eye or nose. As we all know, poor ventilation during combustion can lead to a decrease in oxygen content, resulting in incomplete combustion and increased CO production. When the concentration of CO in the room continues to increase, people will gradually feel headache, nausea, difficulty breathing, collapse, dizziness.

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Other Detector

Formaldehyde detector is an instrument for detecting formaldehyde. Generally, semiconductor sensors and electrochemical sensors are used to realize the rapid semi-quantification of formaldehyde in indoor air on the spot, which is characterized by simple structure, small size, intuitive,easy to carry and use.

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PARAMETER

Specification Product Size

Technical Data Sheet

Part No.			GM-702B
Sensor Type			MEMS CO Gas Sensor
Standard Encapsulation			Ceramic
Detection Gas			CO gas
Detection Range			5~5000ppm (CO)
Standard Circuit Conditions	Loop Voltage	V_C	≤24V DC
	Heater Voltage	V_H	2.5V±0.1V AC or DC (high temp.) 0.5V±0.1V AC or DC (low temp.)
	Heating Time	T_L	60s±1s (high temp.) 90s±1s (low temp.)
	Load Resistance	R_L	Adjustable
Sensor character under standard test conditions	Heater Resistance	R_H	80Ω±20Ω（room temperature）
	Heater consumption	P_H	≤50mW
	sensitive materials resistance	R_S	1KΩ～30KΩ(in 150ppm CO)
	Sensitivity	S	R₀(in air)/R_S(in 150ppmCO)≥3
Standard test conditions	Temp. Humidity		20℃±2℃；55%±5%RH
Standard test conditions	Standard test circuit		V_H: 2.5V±0.1V (high temp.) 0.5V±0.1V (low temp.) V_C : 5.0V±0.1V

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