The 1 to 2000 mTorr explosion proof Pirani sensor can be used with any of the 1 to 2000 mTorr transmitters, indicators or controllers that Vacuum Research manufactures. The sensors are complete and ready to install in any Class 1, Group C or D, Div. 1 area. Simply select the range that fits your application. Like standard Vacuum Research sensors, explosion proof sensors are unaffected by lead length and can be located up to 500 feet (150 meters) from the transmitter, display unit or controller unit.