supply of standard calibration gas mixture for dissolved gas analyzer with regulator nozzle fine control 0.5 litres w/c aluminium high pressure canisterstandard calibration gas mixture for dissolved gas analyzer with regulator nozzle fine control 0.5 litres w/c aluminium high pressure canister,standard calibration gas mixture for dissolved gas analyzer with regulator nozzle fine control 0.5 lit res w/c aluminium high pressure canister with fine control needle valve and septum as spares to draw sample dire ctly from canister using gc syringe.preparation tolerance (plus or minus 05-20 %) and shelf life 12 months. filling p ressure 20 kg/sq.cm.gas composition is as follows: hydrogen 1000 ppm, methane 1000 ppm,. ethylene 1000 ppm, ethane 1000 ppm, acetylene 1000 ppm, carbon monoxide 5000 ppm & carbon dioxide 5000 ppm; nitrogen as bala nce . complete with takeup valve, pressure regulator, septum and test certificate. make-spantech or centurion scientific or similar . [ warranty period: 30 months after the date of delivery ] ]