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-   -   Discrepancy between probe temp and thermometer temp... (http://www.homebrewtalk.com/f35/discrepancy-between-probe-temp-thermometer-temp-183730/)

Burgs 06-23-2010 10:30 PM

Discrepancy between probe temp and thermometer temp...
So, when you guys use charts like this:


To establish proper temperatures and psi settings, do you rely on the temperature from whatever digital or analog probe you're using on the thermostat?

I've had instances where there's been a 4-5 degree difference between what my probe is reading and what the small little analog thermometer that I placed in the freezer is reading. Am I getting inaccurate thermometer readings from the small analog one because it's sitting right on the cold floor of the freezer (or sometimes the hump)? Normally if the probe reads 45-47, it will read 42.

In a situation like that, I'm having trouble deciding what to put the PSI at because I don't know if the beer in the keg is closer to 42 or 45. Currently it's at 13 psi, and I don't have foaming issues or anything like that, but I want to make sure I'm shooting for the middle for ale styles of beer and not undercarbed.

wildwest450 06-23-2010 11:00 PM

Trust neither, pour two glasses of beer and check the second one with a trusted digital thermometer, I use my mash thermometer. Then adjust your controller accordingly. Although a 3f to 4f variance isn't really much to worry about, it will hardly change your final carbonation.


Burgs 06-24-2010 11:20 AM

I gotcha, I'll try that tonight - thanks

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