9
PH/ORP OPTION
CALIBRATION
CALIBRATION PROCEDURE
1. Test the pool water with a test kit (pH 7.2-7.8; Orp 500-750mV)
2. If the ph/Orp sensors readings are not correct, use a small flat head screwdriver to adjust the potentiometer
(R11) on the pH circuit board. Very slowly adjust the potentiometer until the display on the panel shows the
correct reading.
Note: Wait until the display reads a constant correct setting before moving to next step.
3. Calibration is completed.
4. The display on the panel will show the actual pH reading in the spa. Add any necessary chemicals to insure that
the pH sensor reading remains between 7.2 and 7.8 pH.
5. Requirement: Use a test kit no less than once a month to verify calibration and optimal Orp reading.
Note: ORP readings are affected by the following factors: water temperature, total dissolved solids,
cyanuric acid, and alkalinity.
INSTALLATION
1. Splice in a 1 1/2" x 1 1/2" x 1/2" or 2" x 2" x 1/2" reducer tee (depending upon size of pipe configuration).
Position the 1/2” female pipe thread on the tee at approximately 45°.
2. Press the two stand-offs into the digital control board.
3. Remove the pH jumper from the 4-pin connector (J20 for circuit board #25500 or J11 for circuit board #25501) on
the control board.
4. Install the pH board onto the control board. Important! The pH board must be installed component side up.
Make sure that J20 or J11 and the two stand-offs snap fit into the pH board.
Note: All sensors are shipped with the measuring end covered with a wetting cap.
5. Remove the wetting cap by twisting it counter-clockwise and gently easing it off. It is recommended that this cap
be retained for future long-term storage and winterization.
Note: Hand tighten sensors in place. Do not use a wrench to install the sensor as this could cause breakage.
Use a wrench to remove the sensor only if unable to do so by hand.
6. Install the pH sensor into the 1/2" NPT tee by turning the sensor clockwise. Hand tighten only.
7. Feed the BNC connector (from the outside of the control box) through a hole on the bottom LEFT side of the box
for a horizontally-mounted system. Pass the BNC connector through a hole on the bottom RIGHT side of the
control box for a vertically-mounted system.
8. Connect the BNC connector to the pH board. First align it with its mated connector, then press them together
and then twist to lock them into place.
9. Turn the system power on.
CARE AND MAINTENANCE
UNPACKING
Remove the electrode from its package and check that it is undamaged. If damaged, contact your supplier for
replacement. Most electrodes are rugged in design, but some are fragile. Care should be taken when unpacking
and handling all electrodes.
PREPARATIONS FOR USE
All electrodes are shipped with a wetting cap covering the measuring end. This cap contains a solution of pH 4
buffer saturated with potassium chloride for single-junction combination electrodes, and solution of potassium nitrate
in pH 4 buffer for double-junction electrodes. Mono-measuring electrodes, pH and ORP, are shipped in pH 4 buffer.
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