Commercial Pool Keeps blowing ORP Probes!
Suspect: Current in the water
History: Commercial pool in Norfolk, VA. Apartment Complex, built 11/20014, Concrete. Pool on second floor equipment on first floor. Equipped with HCC200 system, (2) Aquarite salt generators w/ T-15 cells, Triton II Commercial Sand Filter, Whisperflo Pump, (1) Universal Color Logic (White), 17,500 Gallons, (3) Deck jets, (6) hand rails (S/S)
Management has never been able to maintain proper chlorine level w/ automation ORP levels vary hour to hour, day to day.
The pool has first been replaced with new probes, they read in the 350 mV range with 3.5 ppm Cl with DPD test
Replaced the HCC2000 system still has the same problem
Replaced probes again, same problem
Hayward has authorized and provided these products
I have been disconnected from this issue until today, and installed a CAT4000 to replace system
Same problem low ORP and good Cl levels, but system locks out and stops producing chlorine
Removed ORP probe and installed new probe but instead of installing in sample well, placed in bucket of pool water.
Removed from the circulation system, probe is reading more accurate mV at 600
pH probe is accurate both in bucket test and in sample well
Hypothesis: This is not developed by myself, but by speaking with Pat with CAT controllers who is the developer of the system. The only possible issue is there is an electrical current in the circulation system that is damaging the probes. The problem is almost instantaneous and the ORP probe is destroyed
What I am asking: I need an electrician that understands the equipotential bonding grid and can explain why and how to find the break in ground with the best resolve to the problem. I have considered running a bonding wire #8 from the panel ground to the pool equipment in the equipment room but dont want to keep damaging ORP Probes, they are not cheap. There is nothing within 5' or 10' of pool that could contribute to this problem I am at a loss.
Very open to ideas and thoughts. I need to readdress issue by 8/17/15. Thanks in Advance