Detcon Model TP-424C, Hydrogen Sulfide sensors are designed to detect and monitor H2S in air over the range of 0-100 ppm. The sensor assembly consists of a proprietary solid state semiconductor sensor in a stainless steel housing, a plugin control transmitter circuit, a base connector board and an explosion proof enclosure。 CSA-NRTL Approved: Class I, Division 1, Groups B, C, & D _ Plug-in field-replaceable transmitter and sensor _ Response Characteristics equal to that of electrochemical sensors T-50 <45 sec., T-80 <90 sec. _ VERY wide operating temperature range: -40°F to +175°F _ 10 year conditional sensor warranty _ Integral sensor fault diagnostics _ Direct response constant temperature control _ Withstands exposure to high range concentrations of H2S and other acid gases _ Impervious to high moisture environments in both powered and non-powered mode