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SYSTEM MAINTENANCE
43
Pool Chemistry Controller Sensor Maintenance
Warning: The sensors are very delicate devices. They must be handled with care and protected at all times. Take care
not to scratch or break the glass tip.
Helpful Hints:
• Do not allow the sensor tip to dry out for more than one hour or damage to life or accuracy may occur.
• The sensor tips must always be kept wet when in use or storage.
• The sensors are threaded into the Flow Cell using Teflon tape. It is not recommended to use any “dope compound” or
glue to install the sensors.
• Save the cap, box and packaging that the sensors came in for storage.
• Do not over tighten the sensors into the flow cell as the flow cell housing may be damaged by this.
• The sensors require 24 hours to stabilize when first installed. Any calibration should be done after this point.
Removal
The ORP and pH sensors are connected to the #75001 Pool Chemistry Controller electronic processor unit using BNC connectors.
These are designed to install and lock into position as shown on pg. 19.
• Slide the BNC connector onto terminal and twist the lock knob clockwise to lock in place.
• Twist the lock knob counterclockwise and slide down to remove.
Similarly, unthread the sensors counterclockwise to remove from the flow cell, and clockwise to install into the flow cell.
Take care to keep to keep the sensor tips wet unless cleaning.
Cleaning
The sensor tips should be cleaned periodically using a degreasing dish detergent, such as Dawn, and a soft cloth or soft bristle
brush. Follow these steps for cleaning:
1. Turn the Main circulation pump off
2. Remove the sensor from the Flow Cell
3. Clean the sensor tips with a soft cloth or brush and detergent
4. Rinse with fresh water, re-tape with Teflon tape and reinstall.
5. Allow 24 hours or oper ation to re-stabilize the sensor display.
Testing the Flow Cell
The flow switch contained in the Flow Cell is an important safety protection device. When water flow has stop pe d, it is important
that the SuperCell be automatically turned off to prevent damage to the cell or system. It is important to verify the safe and
proper operation of the Flow Cell’s Flow Switch protection device. The following procedure can be used to verify the proper
operation of the flow switch.
1. Turn the Flow Cell inlet (left side) valve to the off position.
2. The Digital Control Unit should detect a low water flow at the Flow Cell and activate the red Check System LED. The
Digital Control Unit will also display the message “Purifier Off! Check Flow at sensors”.
3. If the Control Unit did not display this warning, then check the flow switch or cable connections for damage or loose
connections.
4. Remove the flow switch and using a continuity tester, check for continuity while manually activating the flow switch.
5. If the flow switch operates properly, service is needed on the Pool Chemistry Controller electronic circuit.
6. Contact AutoPilot for service.