temperature accuracy

negia22 · 09/11/2012, 11:51 AM

I have 28 nano cube in cycle right now.

Now my problem is which one is correct on the temperature reading. I have 2 thermometer, coraline which says 81.7F placed at the sump then the other one says 81F inside the DT.

While I was looking at my aqueon heater, even with the temperature readings on both thermometers are high, it turned on where I placed it on 80F changing both readings to 81.2F and 82.2F respectively.

Will I be worried now? got so confused...

bnumair · 09/11/2012, 12:51 PM

i have a reef keeper temp probe and a apex probe sitting side by side in sump they are both about 1F off from eachother. so i take the average of both. Also heaters are not 100% precise in temp settings. meaning if u set then say at 78 it wont shut of at 78 might take it upto 79 and then shut off so i wouldnt go by heaters performance.

bnumair · 09/11/2012, 12:53 PM

You can also check the accuracy of ur temp probes/thermometer by getting a glass filling it with 50% water and 50% ice. mix it and let it sit for 3-5 min. mix it again then take temp.
it should say (ideally) 32F.

thegrun · 09/11/2012, 03:08 PM

Your best bet by far is to purchase a good lab grade thermometer and use it to calibrate all your other devices. You regularly see digital thermometers off by 2 degrees or more.

disc1 · 09/11/2012, 05:29 PM

You can't be worried about a 0.7 degree discrepancy. You really shouldn't be worried about a 2 degree discrepancy.

If you let that little tiny bit of temperature bother you that much, other parameters on your tank are going to drive you absolutely crazy. Most of these things have a range of acceptable. If one thermometer reads 81 and the other reads 82, figure the temp is in the low 80's and that's OK.

planedoc · 09/11/2012, 05:29 PM

Quote:

Originally Posted by bnumair

You can also check the accuracy of ur temp probes/thermometer by getting a glass filling it with 50% water and 50% ice. mix it and let it sit for 3-5 min. mix it again then take temp.
it should say (ideally) 32F.

That's what I do and here is the thermometer I use. Once calibrated I stick it in tank and see what the difference is between the two.
http://www.amazon.com/gp/aw/d/B00009...7406069&sr=8-1

negia22 · 09/11/2012, 06:24 PM

Quote:

Originally Posted by bnumair

i have a reef keeper temp probe and a apex probe sitting side by side in sump they are both about 1F off from eachother. so i take the average of both. Also heaters are not 100% precise in temp settings. meaning if u set then say at 78 it wont shut of at 78 might take it upto 79 and then shut off so i wouldnt go by heaters performance.

thank you,

Quote:

Originally Posted by bnumair

You can also check the accuracy of ur temp probes/thermometer by getting a glass filling it with 50% water and 50% ice. mix it and let it sit for 3-5 min. mix it again then take temp.
it should say (ideally) 32F.

I will do this right away. thanks

Quote:

Originally Posted by thegrun

Your best bet by far is to purchase a good lab grade thermometer and use it to calibrate all your other devices. You regularly see digital thermometers off by 2 degrees or more.

will think about buying one, thanks

Quote:

Originally Posted by disc1

You can't be worried about a 0.7 degree discrepancy. You really shouldn't be worried about a 2 degree discrepancy.

If you let that little tiny bit of temperature bother you that much, other parameters on your tank are going to drive you absolutely crazy. Most of these things have a range of acceptable. If one thermometer reads 81 and the other reads 82, figure the temp is in the low 80's and that's OK.

I just want to make sure I am in the right track, first saltwater tank for me. Will try to stay cool as possible.

Quote:

Originally Posted by planedoc

That's what I do and here is the thermometer I use. Once calibrated I stick it in tank and see what the difference is between the two.
http://www.amazon.com/gp/aw/d/B00009...7406069&sr=8-1

thank you...

chris s · 09/11/2012, 07:51 PM

Just some gee-wiz info. Coraline digital thermometers are advertised as accurate +/- 2 degrees F.

negia22 · 09/11/2012, 08:04 PM

Quote:

Originally Posted by chris s

Just some gee-wiz info. Coraline digital thermometers are advertised as accurate +/- 2 degrees F.

thank you, really glad to know.

09/11/2012, 11:51 AM	#1
negia22 Registered Member Join Date: Sep 2012 Posts: 125	temperature accuracy I have 28 nano cube in cycle right now. Now my problem is which one is correct on the temperature reading. I have 2 thermometer, coraline which says 81.7F placed at the sump then the other one says 81F inside the DT. While I was looking at my aqueon heater, even with the temperature readings on both thermometers are high, it turned on where I placed it on 80F changing both readings to 81.2F and 82.2F respectively. Will I be worried now? got so confused...

09/11/2012, 12:51 PM	#2
bnumair Dr. Reef at ur service Join Date: May 2009 Location: Tulsa, Ok, USA Posts: 7,751 Blog Entries: 15	i have a reef keeper temp probe and a apex probe sitting side by side in sump they are both about 1F off from eachother. so i take the average of both. Also heaters are not 100% precise in temp settings. meaning if u set then say at 78 it wont shut of at 78 might take it upto 79 and then shut off so i wouldnt go by heaters performance. __________________ Water Quality: NO3 0,Phos 0,Cal 440,Alk 7.5,Mag 1300 "Reef Fast, You Crash, Reef Slow, You Pass" Mike's Reef 3:16 Current Tank Info: 350g DT,95g sump, 50g Frag tank, 4800gph return 4x Sea swirls. 6x AI Vega Color. 200# Pukani rock, dual recirculating skimmer, Biopellet, GFO Carbon rx's, Cal rx. Closed loop. 1.5hp chiller, genesis renew. Apex & RKE

09/11/2012, 12:53 PM	#3
bnumair Dr. Reef at ur service Join Date: May 2009 Location: Tulsa, Ok, USA Posts: 7,751 Blog Entries: 15	You can also check the accuracy of ur temp probes/thermometer by getting a glass filling it with 50% water and 50% ice. mix it and let it sit for 3-5 min. mix it again then take temp. it should say (ideally) 32F. __________________ Water Quality: NO3 0,Phos 0,Cal 440,Alk 7.5,Mag 1300 "Reef Fast, You Crash, Reef Slow, You Pass" Mike's Reef 3:16 Current Tank Info: 350g DT,95g sump, 50g Frag tank, 4800gph return 4x Sea swirls. 6x AI Vega Color. 200# Pukani rock, dual recirculating skimmer, Biopellet, GFO Carbon rx's, Cal rx. Closed loop. 1.5hp chiller, genesis renew. Apex & RKE

09/11/2012, 05:29 PM	#5
disc1 -RT * ln(k) Join Date: Sep 2010 Location: Little Rock Posts: 9,705	You can't be worried about a 0.7 degree discrepancy. You really shouldn't be worried about a 2 degree discrepancy. If you let that little tiny bit of temperature bother you that much, other parameters on your tank are going to drive you absolutely crazy. Most of these things have a range of acceptable. If one thermometer reads 81 and the other reads 82, figure the temp is in the low 80's and that's OK. __________________ David Current Tank: Undergoing reconstruction...

09/11/2012, 03:08 PM	#4
thegrun Registered Member Join Date: Dec 2008 Location: Garden Grove, Ca Posts: 17,023	Your best bet by far is to purchase a good lab grade thermometer and use it to calibrate all your other devices. You regularly see digital thermometers off by 2 degrees or more.

09/11/2012, 07:51 PM	#8
chris s Registered Member Join Date: Jul 2010 Location: Douglasville, Ga Posts: 94	Just some gee-wiz info. Coraline digital thermometers are advertised as accurate +/- 2 degrees F.