M920 & M920W pH/Dual ORP Controller Owner’s Manual
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D. Maintenance
1. Winterizing (extended shutdowns or colder climates)
a. Turn o the M920 controller and shut o main power to
controller.
b. Gently remove the pH and ORP sensors from the ow cell. Fill
the provided protecve caps (removed during installaon) with
water and re-install onto each sensor, and store in a warm,
secure locaon. Sensor ends must remain in water for the
duraon of the storage me.
c. Drain the water from the ow cell.
2. Cleaning the sensor ps
Note:Itisimportanttokeepthesensorpscleantoensureaccurate
readings.
a. Sensor ps should be cleaned every 3 to 6 months for
commercial pools and spas, and every 6 to 9 months for
residenal pools and spas. Determine the necessary frequency
by comparing the readings before and aer the cleaning.
Idencal readings mean that the cleaning me can be extended.
b. Turn o the M920 controller.
c. Close the right and le valves at the boom of the ow cell.
d. Loosen the nut ng on the sensor and gently remove it from
the ow cell.
e. Swirl the sensor p in a soluon of liquid dish soap and water
for 30 seconds and rinse with water.
f. Swirl the sensor p for 5 seconds in Muriac acid or white
vinegar and rinse with water. Note: Do not touch or brush the
sensorp.
g. Gently re-insert the sensor into the ow cell and hand ghten
the nut ng.
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