Tender For supply of standard gas mixture for calibration of dissolved gas analyzer 10 ltr capacity aluminium can with nozzle and screw fine control valve on to out let value, concentration of gases as methane 100 ppm, et hane 100 ppm, acetylene 50 ppm, carbon dioxide 2500 ppm, carbon monoxide 1000 ppm, hydrogen 150 p pm, ethyene 200 ppm, nitrogen balance . ]