Q. How should the ORP sensor respond to adding acid?
A. Adding acid decreases the pH level thus increasing the ORP.
Q. How should the ORP sensor respond to adding base?
A. Adding base increases the pH level thus decreasing the ORP.
Q. How should the ORP sensor respond to adding sanitizer?
A. Depending upon the type of sanitizer used, the ORP should
increase. A sanitizer high in base, such as liquid chlorine (sodi-
um hypochlorite) or a dry chlorine powder (calcium hypochlo-
rite), however, can cause the pH level to rise and the ORP to
decrease. The pH level must be in the ideal range to maintain
the proper ORP level.
Q. Can ORP be used with ozone?
A. Even though ozone is an excellent oxidizer, it has a very short
lifetime. Therefore, a chlorine or bromine residual will still be
needed in order to maintain the proper ORP level. When using
ozone, the ozone must be introduced into the system down-
stream from the sensors.
Q. Can ORP be used with UV or metal ions?
A. Only if the proper chlorine or bromine residual is maintained.
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Summary of Contents for Watermatic C-660
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