... breeding, food processing, printing, metallurgy, pharmacy, fermentation, chemical industry, water and other solution PH value of the online detection,swimming pool ... two groups of ON/OFF relay contact, divided into high and low alarm control.9.Signal isolation output: 4~20 mA ... be set randomly,relay load 10A 220VAC11.Working conditions: environmental temperature is 0 ~ 60°C, relative humidity is 90% or ...