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Old 01-11-2012, 07:25 PM   #1
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Default Correct wiring of Brewers Hardware Temp Probe to BCS

This might be a pretty basic question, but I was wondering if I have the wiring correct on my temp probe. I seem to be having grounding issues where the temp will read correctly for a few days then all of a sudden go berserk and read orders of magnitude off. (for example, should read 65, but reads 250). On the Brewers Hardware website, the instruction for the BCS temp probes reads:

"Since these are thermistor-based temperature sensors, there is no polarity to the sensor itself. The black and orange wires are used, the red and brown wires are unconnected. The unshielded drain wire is in contact with the temperature probe end but is not electrically tied to ground."

On the sensor that I received from him there are black, red, white, and an unshielded wire. Not the colors indicated in the instructions. I was wondering which color I connect to Temp In and which I connect to Ground. Currently I have the black connected to Temp In and White to ground. It seems to work, but I was still having issues. Do I use the unshielded wire as ground? I test wired it that way and the temp reading was off which means I just might need to recalibrate.

Thanks!!!

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Old 01-12-2012, 01:39 AM   #2
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I attached two photos of my setup. Not that it has much to do with the temp probe itself. I have the bcs 462 mounted on the wall because eventually I'll have another panel for brewing operations. The two LED lights show if heating or cooling is activated and the LED display shows the set and actual temps. This allows me to see what's going on without pulling it up on my phone. I still need to tidy up the internal wiring.

image-3512015778.jpg   image-54134626.jpg  
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Old 01-12-2012, 02:52 AM   #3
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I had a similar issue and found the wires were shorted out inside a fitting I had installed. once that was corrected, what I thought was a bad sensor was good to go.

The other bissue is make sure all of your grounds are tied together both AC and DC. There is a thread on the BCS site discussing this.

Good luck

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Old 01-12-2012, 12:57 PM   #4
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I definitely have all of the grounds tied together. That made a huge difference one I tied AC to DC. Everything quieted down.

I'm hoping its not a short somewhere. I am just trying to get a confirmation on which wires from the temp probe are supposed to be connected to temp in and ground.

I'm going on 30 hours of run time now without error...knock on wood =)

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Old 01-16-2012, 06:36 PM   #5
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So after about three days of run time the temp reading went crazy again...still trying to get a confirmation on the proper wiring of the temp probe in my OP. The BCS temp sensor that I got from Brewers Hardware has a red, black, white, and unshielded wire. Which do I connect to Temp in and which to ground. I am hoping I just have this incorrect.

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Old 01-16-2012, 07:21 PM   #6
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I think it is just the black an white that you need to connect, thats what I used for mine if I remember. Check for resistance if you have a multimeter. Only one combination of wires should give you a non-infinite resistance, those are the two to connect to the BCS. Polarity shouldn't matter for the connection. I did not ground the probe I am using.

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Old 01-16-2012, 08:08 PM   #7
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If you did not ground the probe you are using what is your wiring schemaic...i.e. where does the second wire go if not to BCS ground?

My probe is currently set up as

Probe Black -> BCS Temp0
Probe White -> BCS Gnd
Probe Red and Unshielded -> nothing

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Old 01-16-2012, 08:32 PM   #8
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Quote:
Originally Posted by BentTwigBrew View Post
If you did not ground the probe you are using what is your wiring schemaic...i.e. where does the second wire go if not to BCS ground?

My probe is currently set up as

Probe Black -> BCS Temp0
Probe White -> BCS Gnd
Probe Red and Unshielded -> nothing
Yes the second wire is to ground its been a while since I wired it. Your configuration should work.
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Old 01-16-2012, 10:25 PM   #9
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hmm so if I have it wired correctly then I wonder what is causing the bad temp readings?

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Old 01-17-2012, 02:06 AM   #10
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It's the red and white wires you want to use. And Derrin needs to update his site info to match the cable he's using now.

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