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Old 11-08-2012, 09:52 PM   #1
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Default Bypassing electric blanket safety switch

Hi all,
Hoping someone has an idea. I bought an electric blanket hoping to use it as a wrap to keep my Sanke fermenter warm in the garage. This is the model of blanket: http://www.amazon.com/gp/product/B005448ST2/ref=oh_details_o03_s00_i02. I'm using a Johnson Controls thermostat to control the heat.

Unfortunately, the blanket has a safety feature so that when power is applied to the blanket, a switch must be pressed to heat it up. I'm trying to figure out if I can bypass that or if there are products that don't have this feature. A quick review of the guts of the device doesn't show an easy way to bypass the switch.

Any ideas would be appreciated,
Thanks!



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Old 11-08-2012, 10:11 PM   #2
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Tape the switch down?



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Old 11-08-2012, 10:15 PM   #3
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it's a touch switch so taping doesn't work (that was the first thing I tried). The switch must be depressed once after power is on.

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Old 11-09-2012, 12:33 AM   #4
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Have any pics? That will help everyone help you out.

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Old 11-09-2012, 01:17 AM   #5
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Could you turn it on, then wrap it around your vessel? Use a ratchet strap to hold it in place and depress the switch at the same time???

I'm not sure where the switch is located so I'm not sure if that would work.

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Old 11-09-2012, 01:50 AM   #6
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can you just cut the switch out and wire it directly?

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Old 11-09-2012, 02:11 AM   #7
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I use these:

http://www.amazon.com/gp/product/B000F54AOW/ref=oh_details_o06_s00_i00

no safety switch or auto-off mode.

-tch

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Old 11-09-2012, 03:31 AM   #8
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Pictures are in the Amazon listing link I posted above. Strapping it around the vessel and pressing the switch is not a problem but once it reaches temp, the thermostat will cut the power. Later, when the power is turned back on, the unit will be off, even with the switch depressed. It must be released and then pressed to turn on the unit. Very safe design, my loss.

I also took a look at wiring around it. There seems to be some control logic in the blanket itself - the juice is cut off when the power supply is disconnected from the blanket. I'm going to go over it tomorrow with a multimeter to see if I can spot where on the circuit board, the current shifts when the unit turns on and try to short it. Got nothing to lose except a heating blanket that I can't use for my brew.

Thanks for the product link tom_hampton. That's a great find, I'd need 3 to get an even heating around the keg but that should work. Seems like hitting a local drug store or superstore and getting something I can see, check and return is the way to go if I can't make the blanket work.

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Old 11-09-2012, 04:00 AM   #9
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I had a hard time finding something without an auto-shutoff, but good luck. I found one that I could disable, but the other ones were microprocessor controlled, and couldn't be bypassed.

That's why I ended up with the one I linked to. I have 5 of them.

I didn't notice that you were using a BLANKET, until I'd already posted. It looks harder to find a blanket size without all the stupid safety features.

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Old 11-09-2012, 04:35 AM   #10
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This stuff looks interesting:

http://beanfarm.com/product_info.php?cPath=1204_1205&products_id=5569

Looks like its $3.60 per foot and can be wired directly to 110VAC.

Looks pretty ideal.



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Fermenting: Flanders Red, Pumpkin Ale, Scottish 80
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