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#1
08-09-2017, 09:56 PM
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I don't think the voltage is enough to harm anything but I need that ph probe to stay calibrated and working properly to control my calcium reactor. I'm not sure if it's because the controller plug in only has 2 prongs but from the googling I've done it looks like that's the right plug in. Another strange thing I noticed is when I hook up my laptop to the controller while everything was plugged in, the voltage dropped to 2 volts. That was with the laptop charger plugged into the laptop. If I unplug the laptop charger it's jumps back up to 20. Could it be because the laptop being connected to the controller has a 3 prong plug in and takes the voltage from the controller? 
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#2
08-11-2017, 03:22 AM
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I pulled the controller off the tank and tested it in a pale of fresh salt water away from the tank and using different plug ins. when nothing is connected to the water it reads 2.5 volts. when i hook up the controller with only the temp probe it reads 3 volts. When i hook up the ph probe it jumps to 55 volts.
I also tried the ph probe on the conductivity and redox plug ins and still got 55 volts. maybe its time to switch to apex 
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#3
08-11-2017, 03:12 PM
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Three prong plugs are generally used on higher power equipment such as drills & tools of that nature, especially if they have a metal case. It's a safety measure to protect you from shock if the case of the appliance is somehow shorted to the power lead. A GFCI device will also protect you in a similar manner, even if the equipment only has two prongs. Your aquarium equipment should all be connected through a GFCI. It's code these days for any circuit in a damp area or dealing with water.
Salt water is actually a mild electrolyte, i.e. similar to battery acid. If you have two metal objects in close proximity in a salt water solution, there is a potential for electricity to be produced, voltage & current. Your pH probe is metal..... Don't stress out too much. I understand you need the pH probe to work with your controller, but at the end of the day, many folks are quite successful running their tanks with fewer bells & whistles. Voltage itself poses no danger until it is given a path to create current flow, such as your hand in the water & bare foot in a puddle of water. The voltage would need to be quite high to complete that circuit through your body & zap you. In the tank it's unlikely any electrical current is flowing especially if you can put your hand in the water & don't feel a tingle or shock.
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Last edited by mike31154; 08-11-2017 at 03:18 PM.
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#4
08-12-2017, 03:46 PM
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Thanks for the help everyone. Since pulling off the controller I have only been getting 4-6 volts which is low enough for me. I do like the comfort of a controller so I'll be looking into buying a new one.
Thanks 
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#5
08-14-2017, 04:09 PM
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What do you use to measure voltage in the water? What kind of meter?
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#6
08-14-2017, 04:53 PM
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The Profilux probes are galvanically isolated which means there should be no voltage coming through the probes. If the Profilux is new I would send it in for repair. If used, I bet saltwater or saltspray has corroded it.
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#7
08-18-2017, 09:56 PM
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Quote:
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#9
08-27-2017, 04:29 PM
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Hello
Quote:
Titus
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