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Old 07/04/2015, 02:13 PM   #1
Jyetman
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New APEX Temp probe is off by 1 degree

So I bought a new temp probe for the PM2 module. Getting ready to setup a salinity system. Before my COND probe comes in next week I'm installing this new temp probe but its reading 1 degree higher then the original temp probe why? Won't this effect the salinity reading? What do I do what a few days?


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Old 07/04/2015, 02:28 PM   #2
JAustin
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calibrate it. I recommend checking it against a mercury thermometer or to another reliable temperature reading devise.


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Old 07/04/2015, 02:50 PM   #3
Jyetman
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Only thing I can find to calibrate at the moment is a medical digital thermometer will this work?


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Old 07/04/2015, 03:00 PM   #4
mmn
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Quote:
Originally Posted by Jyetman View Post
Only thing I can find to calibrate at the moment is a medical digital thermometer will this work?
Yes it will. You can calibrate it to anything. The question is how accurate is the thing you calibrate it to. Why not just calibrate it to your other probe, if you think that it is accurate?


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Old 07/04/2015, 03:44 PM   #5
sleepydoc
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+1 calibration is only as good as the reference. Does 1 really matter, anyway?


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Old 07/04/2015, 05:19 PM   #6
Jyetman
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If so many are having trust issues with their apex salinity probes why wouldn't the temp probes be the culprit? I mean two apex probes supposedly factory preset have variations of 1 degrees is that a lot to trust to a properly calibrated COND probe? If the TEMP probe isn't calibrated right wouldn't that explain why so many have issues calibrating the COND probes?


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Old 07/04/2015, 07:01 PM   #7
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Quote:
Originally Posted by Jyetman View Post
If so many are having trust issues with their apex salinity probes why wouldn't the temp probes be the culprit? I mean two apex probes supposedly factory preset have variations of 1 degrees is that a lot to trust to a properly calibrated COND probe? If the TEMP probe isn't calibrated right wouldn't that explain why so many have issues calibrating the COND probes?
1 degree won't make any difference in the salinity reading. Especially since you should be calibrating the CondX probe using the PM2 temp probe in conjunction with calibration fluid that is the same temp as the tank water. That process alone will insure your conductivity readings are accurate despite the temp variance.

Also, those of us that use the conductivity probes with our Apex generally don't use it to check our salinity. Instead we use it for trends, fail safes for things such as our ATO's & our auto water changes. We use refractometers to measure our actual salinity.


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Old 07/04/2015, 07:50 PM   #8
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And besides, you're not calibrating the probe. You are calibrating the system to a known standard.


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Old 07/05/2015, 07:10 AM   #9
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Jyetman, 1 degree is pretty close. Besides there are no two probe that are exactly alike. There is tolerences for them. I assume from the comments that it can be calibrated on the Apex if it is too far off to suit you. I am not familiar with the Apex temp calibration but if it is a single point calibration you will only be accurate at the calibration point. There will be a difference in the reading that will be greater the futher you get from the cal point. A two point calibration will be more acurate within the range between the cal points, but the readings will still be slightly different. Remember these are made to fit within the budget of the hobbist. The more accurate you make things to be the cost can skyrocket quickly.

Also probes are not calibrated. The electronics in the controllers is calibrated to the probe. In the case of the temp probe the electronics is calibrated to the center of probe tolerence. This should be fine for us hobbist.



Last edited by n2585722; 07/05/2015 at 07:19 AM.
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