Marketing InformationThe DS-600 is a thermistor based duct sensor designed to work with Thermolec's thermostats and electronic controllers to modulate the heater's capacity according to the heat required. In most cases the DS-600 is used with Thermolec's 0 to 10 VDC room thermostat to allow it to function as a duct stat. It can also be used as a remote duct sensor with our T versions of controllers such as D21-T, D22-T and D21-TS when connected to the 'S S' terminals.