Gas Detector Sensor Gas Detected Ammonia Measurement Range 0 to 500 ppm Compatible Detector Model/Series Ventis Pro5 Compatible Detector Grainger Part Number 49KA01 Sensor Type Electrochemical For Detector Type Portable T90 Response Time 84 sec Sensor Life 2 yr Series Ventis Pro5 Resolution 1 ppm T50 Response Time 30 sec Operating Temperature - Maximum 104 Degrees F Operating Temperature - Minimum -4 Degrees F Chemical Formula NH3