PH unstable

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Lionfan
Posts: 166
Joined: Wed Nov 26, 2014 8:53 am

PH unstable

Post by Lionfan »

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.
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rimai
Posts: 12881
Joined: Fri Mar 18, 2011 6:47 pm

Re: PH unstable

Post by rimai »

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?
Roberto.
Lionfan
Posts: 166
Joined: Wed Nov 26, 2014 8:53 am

Re: PH unstable

Post by Lionfan »

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?
Good idea. I will definitely check temp probes.
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Lionfan
Posts: 166
Joined: Wed Nov 26, 2014 8:53 am

Re: PH unstable

Post by Lionfan »

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?
I unplugged everything from the head unit, except for the power supply and waited for about 10 minutes, nothing changed.
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rimai
Posts: 12881
Joined: Fri Mar 18, 2011 6:47 pm

Re: PH unstable

Post by rimai »

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?
Roberto.
Lionfan
Posts: 166
Joined: Wed Nov 26, 2014 8:53 am

Re: PH unstable

Post by Lionfan »

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?
Not sure what you mean?
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rimai
Posts: 12881
Joined: Fri Mar 18, 2011 6:47 pm

Re: PH unstable

Post by rimai »

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.
Lionfan
Posts: 166
Joined: Wed Nov 26, 2014 8:53 am

Re: PH unstable

Post by Lionfan »

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.
Will do. What am I looking for?
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rimai
Posts: 12881
Joined: Fri Mar 18, 2011 6:47 pm

Re: PH unstable

Post by rimai »

What pH do you get?
What calibration number do you get?
Is it still zero?
Roberto.
Lionfan
Posts: 166
Joined: Wed Nov 26, 2014 8:53 am

Re: PH unstable

Post by Lionfan »

rimai wrote:What pH do you get?
What calibration number do you get?
Is it still zero?
PH went up to about 8, and the calibration number went up to about 550
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rimai
Posts: 12881
Joined: Fri Mar 18, 2011 6:47 pm

Re: PH unstable

Post by rimai »

It seems the board is fine. It should be around 550.
Not so sure why you are getting wrong results with the probe.
Roberto.
Lionfan
Posts: 166
Joined: Wed Nov 26, 2014 8:53 am

Re: PH unstable

Post by Lionfan »

rimai wrote:It seems the board is fine. It should be around 550.
Not so sure why you are getting wrong results with the probe.
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 grade
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