Feature: 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 Note: 1. After the sensor is powered on, it needs to be preheated for about 20s to stabilize the measured data. Heating the sensor is normal since there is an electric heating wire inside, and if it is hot, it is considered abnormal. 2. Avoid long term exposure to harsh environments. Whether the sensor is powered on or not, prolonged exposure to adverse environments such as high humidity, high temperature, and high pollution can seriously affect the performance of the sensor.