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M820 pH/Dual ORP Controller Owner’s Manual
D. Maintenance
1. Winterizing (extended shutdowns or colder climates)
a. Turn o the M820 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: It is important to keep the sensor ps clean to ensure
accurate 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 M820 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 sensor p.
g. Gently re-insert the sensor into the ow cell and hand
ghten the nut ng.
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