Owner`s manual

SECTION 10. MAINTENANCE

CAT 4000 CONTROLLER PACKAGE

The CAT 4000 controller unit is virtually maintenance free. Cleaning of the

enclosure, front panel and flow cell can be performed using a clean, soft cloth

moistened with mild soap and water solution or glass cleaner. Use of abrasives or

harsh chemicals may damage the enclosure and membrane switch panel.

WATER MAINTENANCE

Always test and record water chemistry readings in compliance with Health

Department requirements using a quality manual test kit. Calibrate pH periodically

as described earlier in this manual.

It is important to note that changes in pH, cyanuric acid concentration, total

dissolved solids, and use of additional or alternative sanitizers will all affect the

primary sanitizer residual level relative to ORP. It is important to maintain total

alkalinity on a regular basis to ensure pH stability. To maintain a consistent sanitizer

residual in parts-per-million (ppm), periodically adjust the ORP setpoint.

PRECISION CALIBRATION

The CAT 4000 controller provides instrument-grade accuracy which exceeds that of

most liquid-standard water testing kits. Therefore, it may be preferable to calibrate

pH using commercially available reference solutions.

SENSOR MAINTENANCE

The sensors must be clean and free from oil, chemical deposits and contamination to

function properly. After saturation in pool or spa water, the sensors may need to be

cleaned on a weekly or monthly basis depending on bather load and other facility-

specific characteristics. Slow response, increased need to calibrate pH, and

inconsistent readings are indications that the sensors are in need of cleaning.

To clean the sensors, disconnect from the controller and carefully remove them from

the flow cell. Clean the reference junction (the white teflon ring at the bottom of

sensor body) with a soft tooth brush and regular tooth paste. A household liquid

dishwashing detergent may also be used to remove any oil. Rinse with fresh water,

replace teflon thread-seal tape, and reinstall sensors.

SENSOR REPLACEMENT

CAT Professional Series pH and ORP sensors are engineered to provide the highest

performance and longest possible functional service life. If properly cleaned

sensors provide unstable readings or require excessive calibration, the pair of

sensors should be replaced. For optimum controller performance, replace with

genuine CAT Professional Series sensors PRO15-2 and PRO25-2.