... , metallurgy, pharmacy, fermentation, chemical industry, water and other solution PH value of the online detection,swimming ... or minus 30%8.Control interface: two groups of ON/OFF relay contact, divided into high and low alarm control.9.Signal isolation output ... C, relative humidity is 90% or less12.Input impedance: >1 x 1012Ω13.Output load: load<500Ω (0 ... treatment PH analyzer with signal output 4-20mA