Calibrating Temperature Probe

newfubar · 10/21/2011, 07:26 AM

Gang....I have 2 controllers the apex and the apex lite (Mr. Russ is painfully aware of this

)...both purchased within the last 3 months.

haven't inquired with Mr. Russ, but my temperature readings on BOTH are constantly anywhere from a 2/10 of a degree to almost 1 degree off. Therefore, I'm constantly (every couple days) calibrating to the correct temp based on a NIST thermometer. I calibrate by entering the correct temperature and pressing the calibrate button, then the update settings button, the system will not let me enter a value for the +/- tenths of a degree adjustment on the page before the calibration page. However the +/- adjustment does reflect new temp adjustment after calibrating to exact temp.

Normal or not? Operator error?

Thanks much.

kenargo · 10/21/2011, 09:56 AM

Dont take this wrong but stability is much more important than reading and it sounds like you may be tuning yourself to death. Unless you have a very sanitary calibration environment you could still end up being slightly off and then there are slight variations in the electronics that could lead to slight drift. It sounds like you have it as near perfect as you are going to get without going lab grade.

10/21/2011, 07:26 AM	#1
newfubar Registered Member Join Date: Jan 2011 Location: Ft Lauderdale Posts: 57	Calibrating Temperature Probe Gang....I have 2 controllers the apex and the apex lite (Mr. Russ is painfully aware of this )...both purchased within the last 3 months. haven't inquired with Mr. Russ, but my temperature readings on BOTH are constantly anywhere from a 2/10 of a degree to almost 1 degree off. Therefore, I'm constantly (every couple days) calibrating to the correct temp based on a NIST thermometer. I calibrate by entering the correct temperature and pressing the calibrate button, then the update settings button, the system will not let me enter a value for the +/- tenths of a degree adjustment on the page before the calibration page. However the +/- adjustment does reflect new temp adjustment after calibrating to exact temp. Normal or not? Operator error? Thanks much. __________________ See my tanks:46 Gallon Bowfront w/refugium http://www.youtube.com/watch?v=ozkQMFd4SrY 140 Gallon Rectangle (30" high) w/refugium: http://www.youtube.com/watch?v=wq_cClITLVE Current Tank Info: 140 gallon acrylic & 46 gallon bowfront

10/21/2011, 09:56 AM	#2
kenargo Premium Member Join Date: Jan 2007 Location: Redmond, WA Posts: 8,151	Dont take this wrong but stability is much more important than reading and it sounds like you may be tuning yourself to death. Unless you have a very sanitary calibration environment you could still end up being slightly off and then there are slight variations in the electronics that could lead to slight drift. It sounds like you have it as near perfect as you are going to get without going lab grade. __________________ Click on my name to visit my homepage and access a collection of AquaController and Apex software, tips, trick and other Q&A including a link to the 'unofficial Apex new users guide' with loads of helpful information and don't forget to put a pin in my location map. Current Tank Info: 225G, BK 300 Deluxe, Deltec PF601, Precision Marine Kalkreactor, 2-LMIII+6 pumps, SpectraPure UHE, Apex, LunarSim, Tunze 6305s. Mixed reef, clam, fish, etc.

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