S8-0053 Infrared CO2 Sensor Module with Temperature & Humidity - UART/Modbus/PWM

The S8-0053 module requires a DC power supply between 4.5V and 5.25V. It is critical to stay within this range to ensure proper operation of the NDIR sensor and internal circuitry. Exceeding 5.25V may damage the module.

You can communicate via its UART (TTL-level serial) interface or the industrial Modbus RTU protocol. The default baud rate and data format are typically documented in the datasheet. The module also provides a PWM output for simple alarm functions based on a configurable CO2 threshold.

The sensor's calibrated and most accurate range is 400-2000 ppm CO2. It can report values up to 10,000 ppm in extended mode, but accuracy may degrade outside the standard range. This is useful for detecting high-concentration events or in specific industrial processes.

The NDIR sensor is factory calibrated and generally stable, requiring no routine user calibration. For maximum accuracy, especially after long periods or in varying environments, an optional manual calibration to a known reference (e.g., fresh outdoor air at ~400 ppm) can be performed via command.

While it operates from 0°C to 50°C, it is not rated for waterproofing (IP rating unspecified). For outdoor use, it must be installed in a fully sealed and weatherproof enclosure that protects it from direct rain, condensation, and UV exposure while allowing air exchange for gas sampling.