Hi, I bought a PM1 module to may Apex 2016. I connected the PH probe to the PM1 module and calibrated, it works. ORP2 is disabled. The problem is that I see the PH2 probe and can read it but I can not program it, there is always error informing me that the words (PH2, PH2tank, PH-CAR and other that I used) are not valid. In the base unit I have ph robe (connected to the reactor) a ORP probe - both works corectly.
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