supply of gas detectors , supply of items as per following specifications , flame-proof , fixed , ambient online ng ( ch4 ) detector , sensor: plug in infrared type , sensor housing: ss316 , measuring range: 0-100% lel , supply: 24 vdc , current output: 4-20 ma dc , 2/3 wire , contact ouptut: 3 spdt type relays for alarm / fault indication , display: integral tricolor two or more line backlit lcd display , calibration / configuration: non-intrusive ( non need to open covers ) menu driven without special devices or software , repeatability: +/- 2% fsd or better , response time: 15 seconds or faster , area classification: zone 2 , class iic , t3 , enclosure: epoxy coated aluminum alloy , nema 4x /ip66 , cable glands: 1/2 npt , ss304 , double compression , approvals: atex / ul / csa/ fm/ tuv , mounting: ss , suitable for 2 pipe mounting , communication: rs485 , modbus rtu , with calibration certificate . acceptable makes: draeger , honeywell , dettronics , msa , bieler + lang , omniguard , spectrex , enmet , monicon , respo only . other makes shall be rejected . , online chlorine detector , sensor type: electrochemical cell , power supply: 12-30 vdc , 2 wire , signal output: 2 wire , 4 - 20 ma dc , display: 3 1/2 digit lcd , intrinsically safe , atex / ul certified , approvals: exia iic t4 , zone 2 / ul class i , groups a , b , c and d , measuring range : 0-10 ppm with accuracy of +/-5% of range or better , enclosure: poly phenylene sulphite or better , ip65 , suitable for 2 stand pipe mounting , acceptable makes: draeger , honeywell , dettronics , msa , bieler + lang , omniguard , spectrex , enmet , monicon , respo only . other makes shall be rejected .