The 555 1/4 DIN Chlorination
Controller provides the water and wastewater treatment industry an
automatic and accurate means to control chlorine in potable and wastewater
applications. The 555 can be easily set up to handle flow proportional
control, residual control, compound loop control with lag times, and
dechlorination with sulfur dioxide.
Flow paced (or
positions a chlorine or
sulfur dioxide valve in direct proportion to the water flow rate. For
chlorine, a user-defined "dosage-setting" from 0% to 400%
(the percentage of gas flow to water flow) increases or decreases the
rate of gas feed dependent on water flow rate. Flow paced is well
suited where the water flow rate varies but the disinfection/oxidation
demand remains constant.
positions a chlorine valve based on chlorine residual measurement.
With a user defined residual setpoint, the 555 increases or decreases
the gas feed dependent on deviation from setpoint. Residual control is
ideal for applications where the water flow rate is constant but the
disinfection/oxidation demand varies.
Compound loop control
positions a chlorine valve based on chlorine residual measurement and
water flow measurement. The residual control signal trims the valve
position signal generated by flow proportional control. Compound loop
control is ideal for applications where water flow rate and
disinfection/oxidation demand vary, or where tight control is
Feed forward dechlorination
positions a valve (typically sulfur dioxide) in direct proportion to
the water flow rate and residual level. With a user-defined
"dosage-setting" from 0% to 400% (the percentage of gas flow
to water flow) the 555 increases or decreases the rate of gas feed
dependent on changes in residual level or water flow rate.