supply of dga calibration gas mixture (standard gas) in 500ml cylinder aluminium can contain 10 litres of available gas at pressure 20 kg/cm2 , dga calibration gas mixture (standard gas) in 500ml cylinder aluminium can contain 10 litre s of available gas at pressure 20 kg/cm2 with following compositions 1)methane - 1000 ppm , 2)ethane-100 0 ppm 3) ethylene-1000 ppm 4) acetylene-1000 ppm 5)hydrogen- 1000 ppm 6) carbon dioxide-5000 ppm 7) carbonmonoxide-5000 ppm 8) balance-nitrogen note:- 1) firm shall supply in cans of each capacity 500 ml with septum type needle valve for drawing the gas. 2) gas composition and gas quantity certificate must b e provided & its traceability to: npl delhi , preparation tolerance +/-10%, certificate accuracy +/-2%, stabi lity 12 months minimum along with the supply of material. make - kshama, spantech or similar. [ warran ty period: 30 months after the date of delivery ] ]