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Old 03-11-2011, 06:43 PM   #11
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Layne, are all the sensors acting the same? Or is one different from another?



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Old 03-11-2011, 06:48 PM   #12
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They all fluctuate constantly.
I have not compared them to see if it is a similar amount, or the same time/pace, but I do know that on two different nights, I tried to calibrate. One night on the phone woth you BK, and last night. And those were NOT the same sensor, but had similar results.
I don't remember how much range the first time, but last night, it was 7 degrees.



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Old 03-11-2011, 09:09 PM   #13
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This is the cable that runs from the sensors in the main box to the remote box:

http://www.l-com.com/item.aspx?id=5882

I am of the understanding that the fully shielded nature should protect the sensors from noise???

I did run the sensors past some 220VAC wires in the main box (unshielded) but i didn't think that would make a big enough difference...

In this pic, you can see where the AC runs (orange wires, the other hot leg isn't installed in that pic, but takes the same route) and where the sensor wires enter (the four white cables).


Here you can see how they are next to each other for about 4 inches in the conduit.


I have had a lot more AC/sensor interaction than this with no noise issues before, but maybe the BCS is very sensitive to noise. I need to figure this out.

I am really sorry about this headache Layne. When I fired it up, the sensors read evenly but were just about 1-1.5 degrees off from one another. Have you tried re-entering the factory coefficients???

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Old 03-11-2011, 09:31 PM   #14
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Layne, are you operating any of the other outlets during the calibrations or readings?

Additional info, the shielding is grounded.

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Old 03-11-2011, 09:40 PM   #15
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Nothing else is on.
I just put in Derrins coefficients and it's WAY better.

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Old 03-11-2011, 11:01 PM   #16
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They are still off, but at least now I believe I can adjust them, now that they are staying constant.
I am brewing right now. I'm using my hand held temp gauge.

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Old 03-12-2011, 01:03 AM   #17
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A couple questions, is the BCS powered by a wall wart power supply?, and are you a ways from town or a power substation. The condition shown on the screen and what you describe are symptoms of poor voltage regulation, as the thermistor circuits are quite sensitive to voltage fluctuations. If the service voltage is fluctuating and the power supply is not regulating very well, the thermistor readings will be bouncing around like shown on the screen shot.

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Old 03-12-2011, 02:08 AM   #18
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This is good. A tenth here and there is MUCH better than 7 degrees!
All the temps are off from my hand held thermometer, but at least they are consistant.
Tomorrow I will try to fine tune it.
Thanks a million guys.

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Old 03-12-2011, 02:51 AM   #19
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How sure are you that the hand-held digital is correct? I would check that too...

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Old 03-12-2011, 03:01 AM   #20
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The coefficients provided with the Brewers Hardware probes are ok, but far from perfect. Could be the nature of the beast, but I found that the original BCS probes were more accurate with the provided coefficients.



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