NH3-A1 Ammonia Sensor NH3 Sensor Description Alphasense is expanding its line of electrochemical toxic gas sensors to address industry-specific requirements, including emissions monitoring, process safety, environmental monitoring and VOCs. Ammonia (NH3) Our first family of Ammonia sensors. This sensor is designed for higher concentrations of Ammonia. Sensors for lower level detection are in development. NH3-A1 Ammonia Sensor NH3 Sensor Specifications * Range: 200 ppm NH3 limit of performance warranty * Sensitivity: 17 to 27 nA/ppm in 50ppm NH3 * Response time t90: