... .5; 2.5 2.Flow tem:-20 ~ +50C 3.Environment tem:-20~+50C LZ Metal Tube Chemical Rotameter / variable area Flow ... range: Water: 2.5 ~ 63,000L/h; Air: 0.07 ~ 2,000 m3/h (0.1013MPa, 20°C)2.Measuring ratio: 10 ... temperature: -80 ~ +300°C (For anti-corrosion PTFE: 0 ~ +80°C)6.Working environment temperature: -20 ~ +50 ... ·s8.Connection: flange:Flange standard: 1.6, 2.5, 4.0, 6.4MPa, according to GB/T17241.6-68 ...