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Why are the pH and ORP readings on my AquaController are inaccurate or erratic?

April 26, 2017aquacontroller erratic inaccurate ORP pH readings

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Why are the pH and ORP readings on my AquaController are inaccurate or erratic?

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If the serial cable is to be permanently attached between the AquaController and the PC, a Ground Isolated Serial Connector (SERIPC9) is recommended. The isolator will eliminate potential ground loops between the AquaController and the PC. Grounds loops may cause erratic and inaccurate pH and ORP readings. The ground isolated serial connector is available from either your local aquarium shop or from Neptune Systems directly.