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Old 10-12-2013, 01:34 PM   #1
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Default Capacititative sensing of liquid level

This document shows you how. The obvious way would be to put the capacitative sensor on or in the sight tube. This is first on a series of articles on methods for liquid level sensing.

http://www.digikey.com/us/en/techzon...l-sensing.html

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Old 10-17-2013, 09:02 PM   #2
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Besides bubbler method, has anyone done anything else for liquid sensing?

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Old 10-24-2013, 06:01 AM   #3
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It seems to me that the bubbler method would be the best route to go. I believe you would have a calibration problem with the capacitative sensor with different beer styles.

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Old 10-24-2013, 02:56 PM   #4
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Originally Posted by kenh View Post
It seems to me that the bubbler method would be the best route to go. I believe you would have a calibration problem with the capacitative sensor with different beer styles.
It's possible. Air/steam/CO2 bubbles would be an issue same as for pressure sensors so a bubbler may also be required.

There is good reason to believe that capacitative sensors drift less than pressure sensors so they might not need zeroing every time. I might try to fix one up on my HLT just for fun.
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Old 10-28-2013, 12:31 PM   #5
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Default Turck level sensor....

Hi everybody... My first post. Thought I'd try to contribute right off the bat. I'm using a Turck BC 3-M12-AP6X-0.2M-RS 4T Capacitive level sensor on my mash tun's level tube. I machined a UHMW block that can be slid along the tube to achieve a fully covered grain bed depending on the grain bill. The sensor runs on 24v dc and powers a solid state relay for my gas fired RIMS system's #1 March 815 pump. This is the latest addition to my flat rack system and it works great! It's nice to not have to jockey flows from two pumps during fly sparging. Now I just set my desired water level over the grain bed, put the #1 pump in Auto and set my desired #2 pump flow to the boil kettle.

https://drive.google.com/file/d/0B4Q...it?usp=sharing

This is the false bottom I built for the mash tun. Went round and round with the perforated (round holes) stainless bottoms. Too many stuck sparges. Thick oatmeal porridge is nothing for this RIMS tun.

https://drive.google.com/file/d/0B4Q...it?usp=sharing

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Old 10-28-2013, 05:01 PM   #6
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So if I understand you, the level sensor gives an on/off signal and you slide it up and down the sight tube to set the desired level?

Interesting slotted design for the false bottom, did you get that specially machined?

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Old 10-28-2013, 05:49 PM   #7
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So if I understand you, the level sensor gives an on/off signal and you slide it up and down the sight tube to set the desired level?
Correct, it can be slid up and down to set the desired level in the tun. The pump turns on only when the level gets below the view of the sensor. Sensor is tune-able for sensitivity. We've only run it in a few batches so far but it is working awesome.

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Interesting slotted design for the false bottom, did you get that specially machined?
No, it is one of homebrewing.org 's false bottoms that I modified for my 8 gal tun. Without question the best false bottom design IMO. In my previous system (gravity with a round cooler tun) I used one of the same style false bottoms.... but not until after struggling with stuck sparges using a couple different round hole design bottoms. Breweries don't use round hole designs in their lauter tuns... neither should we.
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Old 10-29-2013, 04:17 PM   #8
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Quote:
Originally Posted by mxrob View Post
Correct, it can be slid up and down to set the desired level in the tun. The pump turns on only when the level gets below the view of the sensor. Sensor is tune-able for sensitivity. We've only run it in a few batches so far but it is working awesome.

(
Interesting, is there an affordable source?
Picked up one of these, but haven't been able to goof with it yet:
http://www.mouser.com/ProductDetail/...3yZ6LcOrsVFg==

Now that the mountain place is buttoned up for the winter, finishing build is on front burner again. Have stand, hardware, plumbing and electrical handled.
Haven't decided on controller yet, Brewtroller or BCS.
What are you using for the brains?
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Old 10-29-2013, 06:31 PM   #9
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Interesting, is there an affordable source?
They certainly do not give them away do they?

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Picked up one of these, but haven't been able to goof with it yet:
http://www.mouser.com/ProductDetail/...3yZ6LcOrsVFg==
Interseting... I had not checked with Omron for a sensor. Interested to see how your testing works out.

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Now that the mountain place is buttoned up for the winter, finishing build is on front burner again. Have stand, hardware, plumbing and electrical handled.
Haven't decided on controller yet, Brewtroller or BCS.
What are you using for the brains?
No CPU... just PID controllers and the auto mash level control. We are working on a Arduino control project with cell phone integration/control next.
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Old 11-24-2013, 12:48 AM   #10
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You can give SUNX (now Panasonic) a try. EX-F1 is usually
under $100.

http://www.clrwtr.com/PDF/SUNX/SUNX-...on-Sensors.pdf

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