supply of set of standard calibration gas canister for dga .set of standard calibration gas canister for dga .,set of standard calibration gas canister for dga consisting of methane, ethane,ethylene, acetylene, hydrogen each 1000 ppm, co and co2 each 5000 ppm and ni trogen balance-01 no, each gases 500 ppm - 01 no, each gases 100 ppm -01 no, with sept a and knob arrangement to draw sample directly from canister using gc syringe, p reparation tolerance+/- 20percent and shelf life 12 months. canister capacity 0.5 lit res, filling pressure 20 kg/sq.cm with test certificate and suitable septum as spare s. [ warranty period: 30 months after the date of delivery ]