bids are invited for calibration and operational gases mse 850 ppm co plus bal. n2 , 7 percent co plus bal. n2 , 4500 ppm co plus bal. n2 , h2 or he 40 percent or percent calibration gas mixture , 150ppm propane plus bal. air , 9000 ppm propane plus bal. air , 18 percent co2 plus bal. n2 , 450 ppm no plus bal. n2 , 9000 ppm no plus bal. n2 , 21 percent o2 plus bal. n2 , 2250 ppm ch4 plus bal. air , 13000 ppm ch4 plus bal. air strings calibration and operational gases used in gemarpts calibration gas mixture, steel bookcases as per is 7761, emergency foldable rescue stretcher, ammonia solution 25%, forklifts (v2) as per is 6765:2003 and is 10517, ammonia, liquor ammonium hydroxide as per is 799, rccb - residual current operated circuit - breakers as per is 12640, wind vane as per is 5799, unmanned aerial vehicle & payload systems for surveillance, hand operated hydraulic pipe bender relevant calibration gas mixture total quantity : 60