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10
pH PERMISSIVE CONTROL SYSTEM
OPERATOR’S MANUAL
8.914-301.0-D • PH-3020 Permissive Control System
The symbol will
prompt you to
put the probe in 'Buf-
fer 1'. Wait for the mV
value to settle.
7. Press the key again.
This will accept the
first calibration value
and will display the
'Buffer 2' pH. Use
the
keys to
program 'Buffer 2' to
4.0 pH.
8. Press the key again.
The symbol will
prompt you to put the
probe in 'Buffer 2'.
Wait for the mV value
to settle.
9. Press the key again.
This will accept the
second calibration
value and will display
the mV/pH (and the
'%' Slope) result of
the calibration.
10. Press the key again to accept this
calibration and exit calibration mode. Press any other
key to abort calibration
If the calibration is unsuccessful (slope<70% or offset
< ± 30 mV) an 'ERROR CALIBRATE' and 'E7' are dis-
played; the calibration
should be repeated or
else the controller reverts
to using the 'last success-
ful' calibration performed.
A slope of less than 70%
indicates a dirty/faulty probe or contaminated buffer.
(Refer to page 20 for other error messages.)
FEED RATE ADJUSTMENT
Even though the controller is designed to automatically
maintain the proper chemical levels, there may be some
underfeeding or overfeeding if the feed rates are set
too low or high. This is due to the lag time between the
beginning of chemical feeding and the sensing of those
chemicals by the sensors after recirculation through the
unit and the tank.
If the chemical levels tends to be systematically on the
high side, you should reduce the feed rate of the chemical
feed pump. This is done by removing the enclosure cap
on the front of the pump and turning the screw counter-
clockwise to slow the pump down. If the chemical level is
too low or takes longer than one (1) hour to adjust, raise
pump speed up by turning screw clockwise.
SENSOR MAINTENANCE
To test the sensor, carefully add a very small amount of
white vinegar or a dilute acid solution to the water and
test the probes. The pH reading should go down. If not,
clean or replace the sensor.
Cleaning The pH Sensor
The cleaning of the pH sensor must be done on a weekly
maintenance schedule if used in a moderate to heavy
oil and dirt load; on a monthly maintenance schedule if
used in a low oil and dirt level.
To clean the sensor, do the following:
• Loosen the sensor from the compression tee. With a
Q-Tip and any household degreaser (i.e. 409) spray
and wipe the sensor probe clean. Rinse with clean
water. Dip the probes into a 5% hydrochloric acid
solution (muriatic acid). This solution is effective for
solubilizing hard water deposits that may occur on
the probe.
WINTERIZING AND SHIPPING
NOTICE: For winterizing and shipping, always keep the
sensor above freezing temperature. Make sure to place
the plastic cap on the tip of the sensor and to add a few
drops of water inside the cap to prevent the sensor from
drying out. Shipping and storing a sensor without plastic
cap will void its warranty.
7.0
Buffer 1
MANUAL
2 Point
CALIBRATE
00.0
mV
pH
4.0
Buffer 2
MANUAL
2 Point
CALIBRATE
10.0
pH
pH
CALIBRATE
HOLD 5 SEC
CALIBRATE
HOLD 5 SEC
CALIBRATE
HOLD 5 SEC
CALIBRATE
HOLD 5 SEC
4.0
Buffer 2
MANUAL
2 Point
CALIBRATE
-177.0
mV
pH
10 0
Slope
MANUAL
2 Point
CALIBRATE
-59.1
mV
%
e7
2 Point
ERROR CALIBRATE
30.0
mV / Ph
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