Target: H2 hydrogen gas
Model: ZE21-H2
Detection range: 0~20000ppm
Detection principle: Module, electrochemical
Characteristics: Hydrogen leakage and leak detection
Size: 25.43x22.33x7.3mm
Working conditions: Resolution 50ppm
Response time ≤60 seconds
Working life 3-5 years (In the air)
Notes: This product has been discontinued

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ZE21-H2 is a special-purpose and miniaturization electrochemical module. It utilizes electrochemical principle which makes the module with high selectivity and stability. Built-in temperature sensor can do temperature compensation; and it has digital output and analog voltage output. It is a combination of mature electrochemical detection principle and sophisticated circuit design.


Hydrogen leakage and leak detection.


  • High sensitivity
  • High resolution
  • Low power consumption
  • Long life
  • Uart output


Model No. ZE21-H2
Detection gas Hydrogen leakage integrated gas
Interfering gases Carbon dioxide, etc.
Output data UART output (3.3V TTL)
Working voltage 5~10V DC
Preheating time 40 seconds
Response time ≤5 seconds
Recovery time ≤60 seconds
Detection range 0~20000ppm
Resolution 50ppm
Working temperature -30℃~65℃
Working humidity 15%RH-90%RH(no condensation)
Storage temperature 30℃~65℃
Life span 3-5 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.