Gas Detector Sensor Gas Detected Sulfur Dioxide Measurement Range 0 to 150 ppm Compatible Detector Model/Series Radius BZ1 Compatible Detector Grainger Part Number 52HP28 Sensor Type Electrochemical For Detector Type Portable T90 Response Time 20 sec Sensor Life 2 yr Series Radius BZ1 Resolution 0.1 ppm T50 Response Time 8 sec Operating Temperature - Maximum 122 Degrees F Operating Temperature - Minimum -4 Degrees F Chemical Formula SO2