M920 & M920W pH/Dual ORP Controller Owner’s Manual
d. Drill a 7/16” hole and tap a 1/4” NPT port to a locaon down-
stream from the lter and upstream from the heater and any
chemical introducon points. Install a tubing connector and ex
tubing to be connected to the le side ow cell port containing
the ow switch. The in-line lter will also be installed in this line
and mounted to a horizontal pipe with band clamps (included).
Note: Verifythatthelterisinstalledwithdireconalarrows
poinnginthedireconoftheow.
e. Drill a 7/16” hole and tap a 1/4” NPT port to a locaon that is
subject to vacuum or reduced pressure (aer heater). Install a
tubing connector and ex tubing to be connected to the right-
side ow cell port. Note:Werecommendthatthistubing
connectorbeinstalledintothedrainholeonthesuconside
of the pump for best performance.
f. Cut a 3” - 6” length of ex tubing and insert into the ow cell’s
sample stream port (center).
3. pH and ORP Sensors
Note: Carefully unpack the pH and ORP sensors and set aside in a clear
areaunlreadytoinstallintotheowcell.
a. Verify that the M920 controller power is OFF.
b. Remove the plasc protecve caps from the sensors and store in
a separate locaon for future re-use.
c. Slide the glass end of each sensor (pH and ORP) into one of the
compression ngs located at the top of the ow cell. Ensure
that the p is submerged into the water to within 1/2” from the
boom of the ow cell. Hand ghten each nut ng.
4. Temperature Sensor (oponal)
a. Drill a 3/8” inch hole aer the lter and before the heater.
b. Insert the temperature sensor into the drilled hole and secure
with a band clamp (included).
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