SAL readings going crazy, PH now off

[bencollinz]

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no clue what is going on. everything's been fine for 4 days and then today this...see attached.

re-calibrated both sensors, no help.

my refrac says the water is 1.026...

[rimai]

What happens when you place the probe in a cup with tank water?

[bencollinz]

What happens when you place the probe in a cup with tank water?

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it's declining still but now it's steady.

[rimai]

That looks like you got some sort of stray voltage.
Can you double check you pumps and float switches?

[bencollinz]

That looks like you got some sort of stray voltage.
Can you double check you pumps and float switches?

this started when I added the water level expansion.

I don't have any float switches in there yet. I unplugged everything including return pump and got this...

Untitled3.jpg (84.97 KiB) Viewed 5090 times

[rimai]

Strange...
What happens if you disconnect the water level?

[bencollinz]

Strange...
What happens if you disconnect the water level?

I unplugged everything except the SAL, including temp and PH and now it says SAL is 6ppt.

If I put the probe in the calibration fluid it's 6ppt as well.

what the heck should I try next?

I rebooted as well, no change.

[rimai]

Is the salinity module connected straight into the relay box?

[bencollinz]

so, to sum up all my troubleshooting, one word, microbubbles. thank you for your help!

moved the sensors to a different part of my sump and all is grand now.