Temp probe accuracy

[KRavEN]

How accurate is the temp probe reading? My temp always seems to read a couple of degrees higher than temp readings I get from other sources like ranco chiller controller, corallife lcd temp probe, and old aquacontroller 2.

I needed some longer probes so I got a couple of 3 meter DS18B20 temp probes from china and they're reading the same as my original RA probes so I don't think it's a DS18B20 issue.

I stuck each in some water I warmed to about 100F to see if they tracked the same at higher temps and each was within a couple tenths of a degree. Then I put them back in my 80F tank water and the DS18B20 probe was reading high again.

Could there be an accuracy issue with the Celsius to Fahrenheit conversion?

[rimai]

They are pretty accurate in mind point of view and experience.
In the datasheet, they say +/- 0.5C
I don't think conversion is an issue, but if you are interested in looking over, here is the code:

Code: Select all

Temp = Temp * 1.8 + 320;