Subtronics India Pvt. Ltd. Manufactures Five Channel Gas Detection System with Meter. Subtronics India Pvt. Ltd. Is an ISO 9001:2000 certified company. Five Channel Gas Detection System with Meter bears the model number 3 ST-CH5. The operating voltage of this product is 240 V.A.C or 6 V.D.C, in case of the main`s failure. It can load five gas detectors. It is an oxidation type gas detector and features external siren facility on control panel.