Can you calibrate a Johnson controller?
Posted: Wed Oct 18, 2006 8:20 am
by TimCA
I recently found the my 18 month old Johnson controller is off by as much as 3 to 5 F. Is there a way to adjust them? I am using a digital lab thermometer as my reference.
Thanks
Tim
Posted: Wed Oct 18, 2006 9:23 am
by josephus
you said Johnson
Posted: Wed Oct 18, 2006 10:48 am
by Sven
You're talking about the digital model correct?
A419's have an offset (OFS in the menu I believe). Use that for your adjustments.
Posted: Thu Oct 19, 2006 6:11 am
by Speyedr
I thought the Johnson Controller was the Analog one. If that's the case, I have the same one, and they wouldn't be very accurate to begin with I would think, since they are analog and the graduation of the dial is not very precise. I'd just set the approximate temp and then use the digital to dial it in. If you are keeping one or a few standard temps, just mark the dial once you have it right. If you want a more precise controller you probably have to go digital like the Rancos models.
Posted: Thu Oct 19, 2006 7:15 am
by rich
I have an analog Johnson controller and I check it frequently with a 32oz cup of water left in the ridge overnight. It's never off by more that one degree.
Posted: Thu Oct 19, 2006 4:43 pm
by Bugeater
I have the analog Johnson controller too (2 actually). I use a cheap digital indoor/outdoor thermometer to monitor the temperature.
Wayne
Bugeater Brewing Company