Subtronics [india] offers three-status multichannel gas monitor 3st-mch. Gas monitor 3st-mch enables the user to monitor the gas concentration of 14 different locations. The system is available in panel mounting type or wall mounting with internal cooling fan and expandable up to client`s requirement [by adding multiple units]. Gas detectors are approved by isi, cmri, cce [chief controller of explosives], dgfas&li, and tac and are avilable for more than 300 gases. While the gas are installed at site, the controller unit is housed in the control room . Any gas leak at site will be displayed in the controller unit in "three status" which becomes very easy for the user to read. The special features of this instrument is compact for its size accommodation and with its four wires technology the system is well protected against any false alarms caused due to spices or hikes. The instrument has a built in buzzer with external siren [optional], which can be remotely installed to grab attention once the gas concentration increases beyond preset level. Master mute, individual potential free contacts, test switch, etc are the features provided for ease of operation by the system.