Replacement Sensor, Gas Detected Combustible Gas, Measurement Range 0 to 150 ppm, Sensor Type LEL, Compatible Detector Manufacturer Part Number VTS-K5232100101, VTS-K5232101101, VTS-K5232110101, VTS-K5232111101, Resolution 0.1 ppm, Operating Temperature - Maximum 50 Degrees F, Operating Temperature - Minimum -20 Degrees F, Chemical Formula LEL