tender for supply, installation and commissioning of new hydrogen gas leak detection system in hydrogen plant, sgtps, mppgcl, brs , supply part :- , supply of gas monitoring system : • display - intelligent alphanumeric 16 x 1 characters lcd type with back-lit facility • display information - scrolling ch. no. with 2-digit % lel / ppm data and status • indications - 4 leds per ch. for healthy, warn (limit 1), alarm (limit2), fault. • controls - accept, reset • channel: 4 nos. • alarms - 2 preset alarms ( warn & alarm) in % lel / ppm range for each ch • output - spst relay contact each for master alarm & fault • accessories - flp cable glands as required. • mains supply - 230 vac, 50 hz • enclosure - wall mounting wp enclosure for safe area installation , hydrogen gas detectors : • gas detection type :- catalytic • detected gas :- h2 • measuring range :- 1% lel between 0- 60% lel • accuracy: - +/- 3% l.e.l. • repeatability: - +/- 3% l.e.l. • zero drift :- less than 2% full scale/month • response time :- 90% in less than 15 secs • sensor housing :- stainless steel type 316 l • load impedance :- 47 ohm max • ingress protection: ip 66 • cem mark :- en 50270 • operating temperature :- -45 to+ 80 deg c • storage temperature :- -55 to+ 95 deg c • humidity: 10 to 90% rh non-condensing • poison resistance: - sulphur compounds & lead compounds have no effect. chlorine & silicon cause loss of sensitivity. • area classification: zone-1, class-1, ex s d ii c t5 as per saa ex-228 certification: saa ex-228 cce r.1 (1) 138/gas tech/ 120 , supply of sensor mounting accessories , calibration kit : standard (2.0% hydrogen bal. air) equiv. to 50 % lel known concentration of calibration gas mixture in 3 ltr cylinder at 100 kg. pressure. flow meter, regulator and pressure gauge with rubber tube. calibration cap , installation & commissioning charges