IPS Controllers M920 Owner's Manual page 14

M920 & M920W pH/Dual ORP Controller Owner's Manual
d. Drill a 7/16" hole and tap a 1/4" NPT port to a location down-
stream from the filter and upstream from the heater and any
chemical introduction points. Install a tubing connector and flex
tubing to be connected to the left side flow cell port containing
the flow switch. The in-line filter will also be installed in this line
and mounted to a horizontal pipe with band clamps (included).
Note: Verify that the filter is installed with directional arrows
pointing in the direction of the flow.
e. Drill a 7/16" hole and tap a 1/4" NPT port to a location that is
subject to vacuum or reduced pressure (after heater). Install a
tubing connector and flex tubing to be connected to the right-
side flow cell port. Note: We recommend that this tubing
connector be installed into the drain hole on the suction side
of the pump for best performance.
f. Cut a 3" - 6" length of flex tubing and insert into the flow 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
area until ready to install into the flow cell.
a. Verify that the M920 controller power is OFF.
b. Remove the plastic protective caps from the sensors and store in
a separate location for future re-use.
c. Slide the glass end of each sensor (pH and ORP) into one of the
compression fittings located at the top of the flow cell. Ensure
that the tip is submerged into the water to within 1/2" from the
bottom of the flow cell. Hand tighten each nut fitting.
4. Temperature Sensor (optional)
a. Drill a 3/8" inch hole after the filter and before the heater.
b. Insert the temperature sensor into the drilled hole and secure
with a band clamp (included).
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