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Old 11/14/2017, 07:55 PM   #1
Jyetman
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Calibrating a TEMP probe with ice water

I have a apex classic and need to calibrate the PM2 temp probe. Can I use a cup of ice water thats partially frozen?


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Old 11/14/2017, 08:43 PM   #2
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That should be fine if you let the probe sit for long enough. I probably would do a bit of stirring now and then, too.


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Old 11/14/2017, 09:07 PM   #3
Jyetman
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Quote:
Originally Posted by bertoni View Post
That should be fine if you let the probe sit for long enough. I probably would do a bit of stirring now and then, too.
Its going to take forever at 15 minutes it dropped from 81 to 57 I gave up and trying a different way. I have a wired weather station and when I put its probe in the ice water it dropped from 81 to 32.4 in 5 minutes. I can assume its off by .4 correct? So when I put the weather station probe in my tank it reads 82 F so its really 81.6 F I think I calculate that right.


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Old 11/14/2017, 10:08 PM   #4
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That's probably close enough. The error might be a linear function or have some other form, but assuming a constant error of 0.4 degrees probably is going to work well enough. So the Apex probe was that slow in responding? Interesting. I don't know anything about temperature probes, though.


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Old 11/15/2017, 03:54 AM   #5
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I think there may be something wrong with your probe. I calibrate mine using the same method(it's how we learned to calibrate cooking thermometers in school) and it reads almost instantly.

New apex or classic?


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Old 11/15/2017, 04:12 AM   #6
five.five-six
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I just use one of these.

https://www.certifiedmtp.com/astm-17...hoCQeEQAvD_BwE


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Originally posted by yellowslayer13:

"I hate that hole"

Current Tank Info: SCMAS Member 135 peninsula euroreef RS180 Apex 250W X2 20k radiums mixed SPS
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Old 11/15/2017, 01:48 PM   #7
bertoni
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I have a similar glass thermometer.


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Old 11/15/2017, 10:44 PM   #8
five.five-six
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I wonder where you got it


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Originally posted by yellowslayer13:

"I hate that hole"

Current Tank Info: SCMAS Member 135 peninsula euroreef RS180 Apex 250W X2 20k radiums mixed SPS
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