Subtronics India Pvt. Ltd. Manufactures Twenty Channel Microprocessor based Gas Monitor. Subtronics India Pvt. Ltd. Is an ISO 9001:2000 certified company. Twenty Channel Microprocessor based Gas Monitor requires an operating voltage of 240 Volts A.C. Twenty solid state semi-conductor type gas detector can be hooked up in this machine. It features any range adjustable alarm, in-built beep buzzers and two relays. Twenty Channel Microprocessor based Gas Monitor has dual alarm levels features built-in external siren facility. The output that the machine produces can be accessed to computer and the adjustable scanning system can be both auto and manual.