My pH seems to be really unstable.
Even in a glass of tank water it will stay at 2.02.
When I go into the pH calibration, it gives me a 0 for the reading. And then sometimes it will bounce back to 8.23 (Normal tank pH)
New probe and relatively new RA plus.
PH unstable
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rimai
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Re: PH unstable
If pH readings are showing zero when calibrating, there is something wrong. It should never be zero.
I have seen it before when a defective temp probe was causing ph readings to show zero when calibrating.
Can you check is this is your case too?
I have seen it before when a defective temp probe was causing ph readings to show zero when calibrating.
Can you check is this is your case too?
Roberto.
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Lionfan
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Re: PH unstable
Good idea. I will definitely check temp probes.rimai wrote:If pH readings are showing zero when calibrating, there is something wrong. It should never be zero.
I have seen it before when a defective temp probe was causing ph readings to show zero when calibrating.
Can you check is this is your case too?
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Lionfan
- Posts: 164
- Joined: Wed Nov 26, 2014 8:53 am
Re: PH unstable
I unplugged everything from the head unit, except for the power supply and waited for about 10 minutes, nothing changed.rimai wrote:If pH readings are showing zero when calibrating, there is something wrong. It should never be zero.
I have seen it before when a defective temp probe was causing ph readings to show zero when calibrating.
Can you check is this is your case too?
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rimai
- Posts: 12857
- Joined: Fri Mar 18, 2011 6:47 pm
Re: PH unstable
Humm. Not sure what is going on then.
If you short out the inner pin to the otter shell on the pH connector in the head unit, what happens?
If you short out the inner pin to the otter shell on the pH connector in the head unit, what happens?
Roberto.
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Lionfan
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Re: PH unstable
Not sure what you mean?rimai wrote:Humm. Not sure what is going on then.
If you short out the inner pin to the otter shell on the pH connector in the head unit, what happens?
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rimai
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Re: PH unstable
use a paper clip or small wire to short out the inner pin to the outer shell of the BNC connector in the head unit.
Roberto.
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Lionfan
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Re: PH unstable
Will do. What am I looking for?rimai wrote:use a paper clip or small wire to short out the inner pin to the outer shell of the BNC connector in the head unit.
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rimai
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Lionfan
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Re: PH unstable
PH went up to about 8, and the calibration number went up to about 550rimai wrote:What pH do you get?
What calibration number do you get?
Is it still zero?
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rimai
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Re: PH unstable
It seems the board is fine. It should be around 550.
Not so sure why you are getting wrong results with the probe.
Not so sure why you are getting wrong results with the probe.
Roberto.
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Lionfan
- Posts: 164
- Joined: Wed Nov 26, 2014 8:53 am
Re: PH unstable
Ive switched between 3 probes I have, all new. Is there a chance some stray voltage has zapped all 3? One is a BRS lab graderimai wrote:It seems the board is fine. It should be around 550.
Not so sure why you are getting wrong results with the probe.