Target: H2
Model: MC33J
Detection range: 0~100
Detection principle: Catalytic
Characteristics: The bridge output is linear, quick response
Response time: ≤2s

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MC33J adopts catalytic combustion principle, and its two arms of electric bridge consists of a test element and a compensate element. The resistance of the test element rises once it meets the hydrogen gas, at the same time, the output voltage of the bridge changes and the voltage variation rises in direct proportion to the gas concentration. The compensate element, as a reference, has the function of compensating temperature and humidity.


Mainly used for hydrogen leakage alarm or concentration detection in home, vehicle and other fields.


The bridge output is linear, quick response, good repeatability and selectivity, good stability, excellent resistance to the interference of hydrogen sulfide gas and organosilicon.


Model MC33J
Sensor Type Catalytic
Standard Encapsulation Metal encapsulation, metallurgical powder net
Working voltage(V) 0.8±0.1
Working current(mA) 170±10
Sensitivity (mV) 1% H2 15-35mV
Linearity ≤5%
Measuring range(%LEL) 0~100
Response Time (90%) ≤2s
Start-up time in air ≤1s
Working Environment -20~+95℃,less than 95%RH
Storage Environment -20~+55℃,less than 95%RH
Lifespan  5years

* 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.