The S420 variable speed metering pump injects solution in direct proportion to an incoming 4-20mA analog signal. To achieve the desired flow rate output, the operator scales the pump’s response to the signal from 25% to 100% of the maximum flow rate output.
The ability to accept a 4-20mA signal makes the pump well suited for use with water treatment controls including pH and ORP monitors to maintain proper water chemistry and to treat effluent discharge water. Installations can include industrial and municipal wastewater treatment facilities and well or surface water treatment for municipalities who supply potable water to residential communities or commercial sites.
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