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Old 09-01-2013, 02:47 PM   #1
aamcle
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If I recirculate through a grain bed, in at the top, out at the bottom, through the pump and back in at the top a simple closed loop.

If the flow through the bed was too slow then the pump would suck all the wort from under the grain be and could be damaged, I would like something that would switch the pump off if this happened rather than have to stand there adjusting flow rates. :-)

What would I need to do or what sensor could I use to prevent the pump running dry?


Many Thanks. Aamcle

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Old 09-05-2013, 09:40 PM   #2
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You could DIY something perhaps by taping foil sheets either side of a silicone tube leading to the pump as a capacitative liquid sensor. Crappy instructable demonstrates -->

http://www.instructables.com/id/Buil...Liquid-Sensor/

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Old 09-06-2013, 05:00 AM   #3
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Arduino and a flow sensor??? You could have the Arduino switch the pump on and off depending on the flow.

http://www.ebay.com/itm/1-30L-min-2-...item2580e6824f

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Old 09-06-2013, 06:55 AM   #4
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I've spent some time thinking about this and I can do it with a "jam jar" and a float switch, not high tech but easy to do and should be reliable.

I'm starting to get the bits for the build together:-)


Thanks for your help. Aamcle

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Old 09-11-2013, 04:19 PM   #5
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I've got one of these

http://www.ebay.com/itm/NEW-Ultra-So...item3f13320208

I should try it for use on liquid levels - we've used something similar at work for liquid levels.

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Old 09-11-2013, 05:03 PM   #6
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Quote:
Originally Posted by atoughram View Post
I've got one of these

http://www.ebay.com/itm/NEW-Ultra-So...item3f13320208

I should try it for use on liquid levels - we've used something similar at work for liquid levels.
The issue is whether it will work for boiling/foaming liquids.
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Old 09-12-2013, 12:00 AM   #7
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Quote:
Originally Posted by atoughram
Arduino and a flow sensor??? You could have the Arduino switch the pump on and off depending on the flow.

http://www.ebay.com/itm/1-30L-min-2-...item2580e6824f
I haven't had much luck with flow sensors and Arduinos, it may depend on what else you're doing on the Arduino but the interrupts are limited and I had concerns on the impact to the rest of my code. For what I was measuring (RO system efficiency), it didn't seem incredibly accurate over long periods of time.

Also, with those flow sensors (I have the Swissflow ones), there is a little propeller in there that looks like it would get destroyed by any grain husk or hop leaf it might encounter.

I would consider a method similar to the Blichmann Autosparge or the MoreBeer sparse thing. Those basically keep a certain level of liquid on top of the grain at all times.
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Old 09-13-2013, 07:14 PM   #8
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Quote:
Originally Posted by jpalarchio View Post
I would consider a method similar to the Blichmann Autosparge or the MoreBeer sparse thing. Those basically keep a certain level of liquid on top of the grain at all times.
This sounds like a pretty good solution.
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Old 09-14-2013, 12:08 PM   #9
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You could put a adjustable height thermocouple submersed, assuming the temp would change when no longer submersed.

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Old 09-15-2013, 02:18 AM   #10
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Quote:
Originally Posted by grathan View Post
You could put a adjustable height thermocouple submersed, assuming the temp would change when no longer submersed.
Yes, that might work, also a adjustable current probe setup would work - I've worked on tanks that had probes with small voltage on them - when the liquid touched them, they sensed the level.
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