Water Maze ALPHA-1500, Operator'S Manual

Page: 15 / 40

ALPHA SERIES
OPERATOR’S MANUAL
15
ALpha 1500-3100 • #8.913-964.0 • REV. 5/11b
pH Calibration
To calibrate the pH, use a reliable, fresh test kit (Phenol
Red). Note the value of the pH and compare it to the
display value.
To change the pH calibration:
Press [CALIBRATION]
Press [pH]; the display flashes
Use the [UP] and [DOWN] arrows to adjust the pH value
Press the [CALIBRATION] again to save the new value.
Out-of-Range Alarms
The out-of-range alarms are factory set at 450 and
650mV 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]
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
casue overfeeding of chemicals.
ORP AND PH SENSOR
MAINTENANCE
The controller is virtually maintenance free. The
enclosure 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 Cleaning/Testing
The sensor tips must be kept clean and free from
chemical deposits and contamination to function prop-
erly. After 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
indications that the sensors
are in need of cleaning.
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
66-123 66-122
To clean a sensor, carefully remove it from the com-
pression 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 solution for five minutes. Rinse with fresh water
and reinstall the sensor.
To check sensor for proper operation place a small
amount of white vinegar, muriatic or hydrochloric acid
into a cup and place sensor probe into solution. For the
pH sensor, the needle should drop. For the ORP sensor,
the needle should rise.
NOTE: Only clean one sensor at a time. Sensors must
stay in some kind of liquid at all times.
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