Winsen ZE21-H2 Hydrogen Gas Detection Module - UART Output, 0-20000ppm Range

The module provides a digital UART serial interface operating at 3.3V TTL logic levels, allowing direct connection to microcontrollers like Arduino, ESP32, or Raspberry Pi. It also offers an analog voltage output for simpler integration with analog-to-digital converters (ADCs) in data acquisition systems.

The ZE21-H2 module requires a DC supply voltage between 5V and 10V. It is crucial to stay within this range to ensure proper sensor heater operation and signal conditioning circuit functionality. A stable, regulated power source is recommended for accurate measurements.

The module requires a preheat time of approximately 40 seconds after power-on to stabilize the electrochemical cell and internal circuitry. After this period, the sensor is ready for accurate measurement. The fast response time (T90 ≤ 5 seconds) enables rapid detection of hydrogen concentration changes.

The electrochemical sensor element has a typical operational lifespan of 3 to 5 years when used in normal atmospheric conditions. Lifespan can be affected by exposure to extreme temperatures, high concentrations of target gas, or contaminating substances. It is considered a consumable component.

Yes, the module is rated for operation in temperatures from -30°C to 65°C and humidity from 15% to 90% RH (non-condensing), making it suitable for many outdoor and industrial applications. The built-in temperature sensor provides compensation, but physical protection from direct rain, icing, or condensation is advised.