I calibrated my ORP module according to the manual.
I used the BNC Terminator and the 470mv buffer (purchased locally).
After calibration, I rinsed the probe at RO water and put it back to the 470mv buffer... just to be sure. The ORP measurement was very very very close to 470mv - as expected.
But from the second I put it on the aquarium water, it raises and get stuck to 550mv (maximun reading value?). I did it two nights ago and it still remains that way.
Is that normal? The manual states that "ORP probes require to break-in in order to start reading accurately.It usually takes about 2 weeks and any control using ORP readings is not recommended". Is that the case? Because if my water is near to 550mv as showed, I have to stop injecting ozone right away!!
Yeah. It takes a while.