40
ACU-TROL
®
AK110 Chemical Controller Installation and User's Guide
ORP Calibration Actions
Hand PPM ORP Display Action
Low Above Set point Cal to below set point: 10mV per each PPM
Check flow and/or clean sensor.
At Set point Cal to below set point: 10mV per each PPM
Below Set point May need to increase chemical feed times.
Perfect Above Set point > 6 May need to decrease chemical feed times.
Calibrate to the set point.
At Set point ±5 No changes
Below Set point >6 Calibrate to the set point.
High Above Set point Decrease chemical feed times.
At Set point Cal to above set point:10mV per each PPM
Below Set point Cal to above set point: 10mV per each PPM
Check flow and/or clean sensor.
EXAMPLE: The default set point is 700, the PPM hand measurement is 1.0 (2.0 PPM desired), and the cur-
rent display shows a measurement of 690 mV. From the above table the hand PPM is low and the ORP is
below the set point. The chemical feed times are not high enough for the ORP to reach the set point and
should be increased.
To compare ORP measurements to PPM measurements per actual pH readings refer to the calculated PPM
chart on page 131.
1. Remove all wires from the sensor card.
2. Insert test strip into the green terminal bar on the sensor card.
Match the pH test strip side to the sensor card side
3. Reset the calibrations with the test strip installed.
4. Call Acu-Trol Technical Support at 800-273-4667 with the sensor readings if your results do not match
the following readings:
ORP 90350-28A pH = 7.65-7.75 ORP = 485-500 Temp = 68.0-71.0
PPM 90350-35A pH = 7.65-7.75 Color = TBD Temp = 68.0-71.0
Using the Test Strip
ORP Troubleshooting
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