Maintenance - IPS Controllers M920 Owner's Manual

M920 & M920W pH/Dual ORP Controller Owner's Manual
D. Maintenance
1. Winterizing (extended shutdowns or colder climates)
a. Turn off the M920 controller and shut off main power to
controller.
b. Gently remove the pH and ORP sensors from the flow cell. Fill
the provided protective caps (removed during installation) with
water and re-install onto each sensor, and store in a warm,
secure location. Sensor ends must remain in water for the
duration of the storage time.
c. Drain the water from the flow cell.
2. Cleaning the sensor tips
Note: It is important to keep the sensor tips clean to ensure accurate
readings.
a. Sensor tips should be cleaned every 3 to 6 months for
commercial pools and spas, and every 6 to 9 months for
residential pools and spas. Determine the necessary frequency
by comparing the readings before and after the cleaning.
Identical readings mean that the cleaning time can be extended.
b. Turn off the M920 controller.
c. Close the right and left valves at the bottom of the flow cell.
d. Loosen the nut fitting on the sensor and gently remove it from
the flow cell.
e. Swirl the sensor tip in a solution of liquid dish soap and water
for 30 seconds and rinse with water.
f. Swirl the sensor tip for 5 seconds in Muriatic acid or white
vinegar and rinse with water. Note: Do not touch or brush the
sensor tip.
g. Gently re-insert the sensor into the flow cell and hand tighten
the nut fitting.
26