Target: CO, CH4
Model: ZE33
Detection principle: Electrochemical
Characteristics: Sound and light alarm output, and PWM digital signal output mode
Output signal: PWM

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Water heater gas leakage and incomplete combustion detection module using electrochemical carbon monoxide sensor and combustible gas sensor developed a special detection of gas water heater incomplete combustion and gas leakage module. It uses the electrochemical principle to detect carbon monoxide gas produced by incomplete combustion in the air, and has good selectivity and stability.


Detection and alarm of gas leakage and incomplete combustion of household gas water heater.


The module has sound and light alarm output, and PWM digital signal output mode.


Model ZE33 RecoveryTime ≤30 s
Detection Gas CO, CH4 Detection Range CO:0~500ppm CH4:0~5000ppm
Interfering gas Alcohol, etc. Alarm concentration   CO:  Alarm  1: 250±50ppm Alarm 2:350±50ppm CH4:8%±3% LEL
Output PWM
Alarm mode Audible and visual alarm Working Temperature -10℃~55℃
Working Voltage 5V DC Working Humidity 15%-90%RH (non-condensing)
Preheat Time CO 30s/CH4 3min Storage Temperature -10℃~55℃
Response Time ≤60 s Lifespan 5 years (in air)

* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.

Technical Support:

Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.

The sensors don't have sleeping mode. It can be set in program if needed.

All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.

The sensor has been fully tested (not calibrated) before leaving the factory. However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.

15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.

Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.

Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.

Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to

Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.