8
NOTICE:
IF THE pH IS BELOW 7.4 OR ABOVE 7.6 THE
ORP READINGS WILL BE SIGNIFICANTLY AFFECTED. If
the pH is high, the ORP will not go up as fast as it should
when chlorine is added. This can lead to chlorine overfeed-
ing, which leads to high PPM readings. Be sure to set the
overfeeds (when you are programming) to prevent this. If
the pH is low, the chlorine will be very active with a high
ORP reading and a low PPM measurement.
Measure the pool water pH using a standard test kit. To cal-
ibrate the pH sensor go to the
pH Calibration
window,
touch the window under
Hand Measurement
and enter the
current hand calibration measurement values on the key-
board, based on the example at the top of the window.
Touch
Enter
.
The window will return to the
Calibrate pH1
menu display-
ing the value entered; touch
OK.
The change will be
recorded along with the sensor reading at the time the cali-
bration was made. Touching
Reset
will clear the calibration
on this sensor.
The
pH Calibration
window displays the following mea-
surements:
Delta:
pH factor used to determine whether or not the
probe is defective. Check probe if reading exceeds 128.
Hand Measure:
The manual pH measurement to be
entered.
Current Measurement:
The current calibrated sensor
measurement.
Calibrating ORP (Figure 17)
NOTE:
A Chemical Kit must be purchased separately and
installed for this calibration.
For the ORP calibration, measure the PPM first using a stan-
dard test kit. Other factors affecting ORP are TDS, cryonic
acid, and ozone.
Make small changes in the calibration. Stop when the chlo-
rine is at the right value. The pH MUST remain constant for
this procedure.
To calibrate the ORP sensor:
1. Touch the window below
Hand Measurement
and enter
the current calibration measurement on the keyboard.
2. Touch
Enter
.
3. The window will return to the
Calibrate ORP
menu (dis-
playing the entered measurement).
4. Touch
OK
. The change will be recorded along with the
sensor reading at the time the calibration was made.
NOTE:
Touch
Reset
to clear the calibration on this sensor.
Example:
The default set point is 700, the measured PPM is
0.5 (1.5 PPM is desired), and the current display shows a
measurement of 710 mV. Using 10-15 mV per PPM as a
rule of thumb, the ORP should be calibrated down 30 mV
below the set point since the PPM is 1 PPM low.
The
ORP calibration
window displays the following
measurements:
Delta:
pH factor used to determine whether or not the
probe is defective. Check probe if reading exceeds 128.
Hand Measure:
The manual ORP measurement to be entered.
pH:
The pH reading taken during the last calibration.
Current Measurement:
The current sensor measurement.
NOTICE:
The pH must be between 7.4 and 7.6 (see
“Calibrating pH”, above) when calibrating the ORP Sensor.
If the pH is outside these limits when calibrating the ORP
sensor, the chlorine feed, ORP reading , and PPM measure-
ment may all be incorrect.
Calibrating Calculated PPM (Figure 18)
NOTE:
The PPM is automatically calculated from the
ORP and pH readings, so a Chemical Kit is required for
the calibration.
Measure the PPM using a standard test kit. If the PPM mea-
surement by test kit is lower than desired, decrease the cali-
bration. If the measurement by test kit is higher than
desired, increase the calibration.
From the
PPM calibration
window, touch the
+
or
-
buttons
at the bottom of the window to increase or decrease the
PPM reading. When the reading is far away from the manu-
al measurement use the
+ +
or
- -
buttons to change the
reading quickly.
Calibrate pH1 x
Delta Hand Measure
0.00 6.89
Current Measurement: 7.22
Reset OK
Figure 16
Calibrate ORP x
Delta Hand Measurement pH
0
700
7.5
Calibrated Reading: 645
Reset OK
Figure 17
Cal Calculated PPM1 x
PPM 1.48
ORP 710
PH 7.49
-- - + ++ Reset OK
Figure 18
