The GCH-140 Gas Cylinder Heater Controller is used with the GCH series sample cylinder heaters. The controller monitors the heater’s temperature sensors to determine the cylinders temperature and regulate the heaters to maintain the cylinder at the set temperature. For the GCH-140 the set temperature is 140 degrees Fahrenheit. Power for the controller is provided by a vehicle 12 volt cigarette lighter or standard 12 volt DC power point connection.