Features 1、Ammonia Sensor: The gas detection module can test the ammonia gas concentration to ensure timely understanding of the gas content in the environment. 2、Great Accuracy: Comes with 5‑500ppm measurement range, the ammonia gas sensor also supports automatic calibration for easy operation and high accuracy. 3、Quick Response: Fast in response, the sensitive ammonia detection sensor with power and TTL signal output indicators can give you reliable results. 4、Stable Outputs: Designed to have DO switch signal TTL output and AO analogue signal output, the analogue output voltage changes with concentration. 5、Better Utility: Able to connect to single chip microcomputer or relay module, which are not included, the gas sensor module enables wide application. Specification Item Type: Ammonia Sensor Module Input Voltage: DC 5V, 24V maximum. Power Consumption and Current: 150mA DO Output: TTL digital quantities 0 and 1, 0.1V and 5V. AO Output: Analog Level Signal Detection Range: 5-500ppm Working Temperature: -10~50℃, 20℃ nominal temperature. Humidity: 95%RH, 65%RH nominal humidity. Package List 1 x Ammonia Sensor Module