bids are invited for supply of various calibration gas cylinders total quantity : 1549; hydrogen gas-purity 99.999-calibration gas balance nitrogen - in 47l water capacity cylinders pressure 150 kg/cm2 - volume 7m3 of gas lab gas 5% hydrogen sulfide cylinder with 95% hydrogen 1.8% hydrogen balance nitrogen in 10l cs cylinder, pressure 120 kg/cm2 calibration cylinder,h2 detectors h2 calibration gas with cylinder nitrogen carrier gas min:99.99% n2 100%,capacity:10l,pr:120kg/cm2 h2s : 250 ppm,balance n2 h2s:80%,balance n2 calibration gas, h2s: 0-4%, balance n2 for air demand analyser calibration gas mixture+balance h2 calibration gasin ampules-h2s 20ppm