supply of a set consists of standard calibration gas canisters , a set consists of standard calibration gas canisters for dissolved gas analysi s (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, etha ne, ethylene, acetylene, hydrogen, co and co2 each 500 ppm and nitrogen balance (qty: 01 n o.) with pressure gauge, septem and knob arrangement to draw sample directly from the ca nister using gc syringe. pressure tolerance +/- 20 percentage and shelf life 12 months. cani ster capacity 0.5 litres, filling pressure 20 kg/sq.cm with test certificate and suitable septe m as spares. [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]