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04/08/2019, 07:06 PM
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#1 |
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Premium Member
 
Join Date: Oct 2000
Location: Palm Coast, FL
Posts: 574
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Ph probe experience
I just recently started using a Ph probe attached to a controller.
It’s been nothing but a headache for me... First I can’t get the calibration right and when I start to think it’s ok the readings go out of wack... Now I can’t get the probe to read at all while in the DT or refugium. It’s reading 0 as soon as it touches my tank water. It reads when in the calibration solution. It reads when it’s in a cup of tank water. Soon as it touches tank water it’s back to zero. I have tested for stray current and I have no issues there. I have even tried unplugging everything and testing the probe, same results. Does anyone know why this is happening? Faulty probe? Makes no sense to me. |
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04/09/2019, 04:27 AM
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#2 |
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Registered Member
Join Date: Jan 2019
Posts: 141
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Sounds like a faulty probe. Have you contacted manufacturer of probe?
Sent from my iPhone using Tapatalk |
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04/09/2019, 05:48 AM
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#3 |
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Registered Member
Join Date: Jan 2016
Location: Seoul Korea
Posts: 24
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That's exacrly same with my problem.
I've rectified it with rerouting the probe cable sagregating from AC cables and attaching ferrite cores on all related cables. As far as I understad electrical noise interferes with the very low voltage signal from the probe. The electrical noise has very low power. Accordingly it cannot be measured by a standard multimeter. It only can be measureed by a osciloscope or an electrical noise analyzer. You'd rather consult with an electrical/electronic engineer who is specialized in troubkeshooting electrical noise problem.
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150G SPS Dominant Tank controlled by GHL Profilux 4 4-Mitras LX7, 2-Vectra M1, 4-MP40wqd, R.E Double Cone 200 w/ RD3 |
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