Subtronics India Pvt. Ltd. Manufactures Two Channel Gas Detection System with Meter, beraing the model number 3 ST-CH2. Subtronics India Pvt. Ltd. Is an ISO 9001:2000 certified company. The operating voltage of Two Channel Gas Detection System with Meter is 240 V.A.C or 6 V.D.C, in case of mains failure. It can load two gas detectors. Two Channel Gas Detection System with Meter is an oxidation type gas detector, featuring external siren on control panel