Winsen ZE21-CS Battery Leak Detection Module - Electrochemical Sensor with UART Output

The module provides a digital UART interface operating at 3.3V TTL logic levels. Connect the module's TX and RX pins to the corresponding RX and TX pins on your microcontroller (e.g., Arduino, ESP32). Ensure a common ground and supply the module with 5–10V DC. The UART protocol allows for direct command-based reading of gas concentration values.

The ZE21-CS is designed to detect integrated gases associated with battery electrolyte leakage and thermal runaway, primarily carbon monoxide (CO) and hydrogen (H2). Its electrochemical cell offers high selectivity for these target gases, though it may respond to high concentrations of interfering gases like alcohol. It is optimized for monitoring battery off-gassing events.

The module requires a 40-second preheat period after power-on to stabilize the electrochemical sensor. It operates from a 5V to 10V DC supply. During preheat, the output readings may be unstable. Ensure the operating environment stays within the specified -20°C to 65°C temperature range for accurate performance.

The electrochemical sensor has a stated life cycle of 5 years in air under normal operating conditions. Periodic calibration against a known standard gas concentration is recommended for maintaining long-term accuracy, especially after extended use or exposure to high gas concentrations. The module's analog output can be used for calibration routines.