supply of set of standard calibration gas canisters for dissolved gas analysis (dga) with the following compositions: 1. methane, ethane, ethylene, acetylene, hydrogen each 1000 ppm, co and co2 each 5000 ppm, and nitrogen balance (qty: 01 no.) 2. methane, ethane, ethylene, acetylene, hydrogen, co and co2 each 100 ppm and nitrogen balance (qty: 01 no.) 3. methane, ethane, ethylene, acetylene, hydrogen, co and co2 each 500 ppm and nitrogen balance (qty: 01 no.) with pressure gauge, septum and knob arrangement to draw sample directly from the canister using gc syringe. pressure tolerance +/- 20 percentage and shelf life 12 months. canister capacity 0.5 litres, filling pressure 20 kg/sq.cm with test certificate and suitable septum as spares.set of standard calibration gas canisters for dissolved gas analysis (dga) with the following compositions: 1. methane, ethane, ethylene, acetylene, hydrogen each 1000 ppm, co and co2 each 5000 ppm, and nitrogen balance (qty: 01 no.) 2. methane, ethane, ethylene, acetylene, hydrogen, co and co2 each 100 ppm and nitrogen balance (qty: 01 no.) 3. methane, ethane, ethylene, acetylene, hydrogen, co and co2 each 500 ppm and nitrogen balance (qty: 01 no.) with pressure gauge, septum and knob arrangement to draw sample directly from the canister using gc syringe. pressure tolerance +/- 20 percentage and shelf life 12 months. canister capacity 0.5 litres, filling pressure 20 kg/sq.cm with test certificate and suitable septum as spares.,set of standard calibration gas canisters for dissolved gas analysis (dga) with the following compositions: 1. methane, ethane, ethylene, acetylene, hydrogen each 1000 ppm, co and co2 each 5000 ppm, and nitrogen balance (qty: 01 no.) 2. methane, ethane, ethylene, acetylene, hydrogen, co and co2 each 100 ppm and nitrogen balance (qty: 01 no.) 3. methane, ethane, ethylene, acetylene, hydrogen, co and co2 each 500 ppm and nitrogen balance (qty: 01 no.) with pressure gauge, septum and knob arrange ment to draw sam