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CLP
OPERATOR’S MANUAL
#96-6294 • Revised 7/04
Out-of-Range Alarms
The out-of-range alarms are factory set at 450 to 650
mV for ORP and 6.5 to 7.5 for pH. If the ORP is below
the low limit, the red LED alarm flashes but the sanitizer
feed continues.
If the pH limits are exceeded, the red LED alarm flashes
and the pH feeder continues.
To change an alarm limit:
• Press [LOW LIMIT] or [HIGH LIMIT],
• Press [ORP] or [pH]; the display flashes,
• Use the [UP] and [down] arrows to adjust the value,
• press [LOW LIMIT] or [HIGH LIMIT] again.
CAUTION: Increasing the out-of-range limits may
cause overfeeding of chemicals.
ORP AND PH SENSOR
MAINTENANCE
The controller is virtually maintenance free. The enclo-
sure and front panel can be cleaned with a soft cloth
moistened with a mild soap and water solution or a glass
cleaner. Do not use abrasives or harsh chemicals.
Sensor Testing
To test the sensors on line, carefully add a small amount
of white vinegar or dilute acid solution in a clean jar and
insert sensor. After a few minutes:
• the pH reading should go DOWN.
• the ORP reading should go UP.
If you get no response or a sluggish response, clean or
replace the sensors as soon as possible.
Sensor Cleaning
The sensor tips must be kept clean and free from chemi-
cal deposits and contamination to function properly. Af-
ter saturation in the waste stream, the sensors may need
to be cleaned on a weekly or monthly basis depending
on the water quality and other facility-specific character-
istics. Slow response and inconsistent readings are indi-
cations that the sensors are in need of cleaning.
To clean a sensor, carefully remove it from the compres-
sion fitting or holding bracket. Clean the tip of the sensor
with a mild liquid detergent (Joy
®
, etc) solution. Rinse
with fresh water and soak the sensor in a mild acid solu-
tion for five minutes. Rinse with fresh water and reinstall
the sensor.
Sensor Replacement
For preventative maintenance it is also recommended to
replace the sensors on an annual basis or as perfor-
mance diminishes.
Sensor Storage
Extended exposure to atmospheric conditions will cause
the sensor tips to dry out. Always remove and properly
store the sensors if they are to be winterized or inactive.
Store the sensors with the original cap provided, making
sure that each cap is filled with clean water. If the stor-
age containers have been misplaced, store the sensors
individually in small glass or plastic containers with clean
water covering the sensor tips.
Terminal Block Wiring
66-123
66-122
B W G
B W G
B W G
ORP R W B Power pH
Rotary
Flowswitch
Dry-Contact
Alarm
B=black, W=white, G=green, R=red