When You're a NOOB, You need lots of help all the time
My original salinity probe was DOA and would never calibrate. Opened a case and got it RMA'd and replaced. I followed the calibration procedure and the probe kept showing about 2-3 points lower than my Hannah digital salinity monitor shows. Figured I would live with it but then the probe just started climbing. My chiller keeps the temperature pretty tight while the salinity probe just is going up and away. The Hannah shows exactly what I would expect.
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That's normal the first couple days. It should level off 100% within a week and it probably 95% of the way there now. If you keep your tank at 35ppt, it looks like whatever mistake you made in calibration got canceled out by the soak in creep.
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When does it stop? It is at 36ppt today and still climbing. I keep mine at 35ppt. My digital refractometer still shows the correct salinity.
Check for stray voltage on your tank. It should have mostly leveled off the first day.
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What are typical raw data values when calibrating the conductivity probe? I have one that is less than 2 months old, and the salinity reading has been jumping upward over the past month. I've tried to recalibrate, but automatic calibration will not proceed due to an unacceptable dry value. The probe has been rinsed in RO, shaken and patted dry with a paper towel. Checking against my refractometer, salinity is fine, at 1.026, so it's not the water that is the issue.
Manual calibration gives the following readings
dry, 732
53,000 us, 663
Salinity now reads 39.3 with a raw data value of 776. As a chemist, this does not make sense, zero ppt salinity should be zero us, and dry should also read as zero us. I think my probe is shorted?
Thanks,
The raw is not truly a raw number unless you first reset the probe (it's actually the current modified value in mS/cm). You can reset it by unplugging the probe and then quickly run through a manual calibration. Once reset the dry stage should be in the -50 to 100 range and the wet stage should be between about 500-700.
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No stray voltage in the tank, don't use any internal pumps, have ground probes and regularly test for it.
I did go ahead and go back and re-calibrate and it seems to have leveled out. Never actually intended too buy an Apex 2016 since I had an Apex Classic since it came out. But a few weeks ago the filtering cap on the power regulator in my Apex Classic shorted and ended up frying my Apex Classic (waaaaaaaaay out of warranty). So I had to go but a new Apex setup.
I had the same issue. After a water change the salinity went notes.
Using the calibration salinity fluid fixed it.
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