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Old 05-13-2010, 03:12 PM   #1
BuzzCraft
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Default sight glass on MLT?

I'm about to convert a keg to an MLT. I'm planning to insulate it and direct fire it to preheat water for the mash, collect runnings in a pot and add pre-measured hot water (from my BK) for the sparge.

I realize a sight gauge would be slightly useful for the initial water addition, but after that it seems like more work (i.e. to clean) than help.

So I'm leaning towards no sight gauge...anyone care to convince me otherwise?

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Old 05-13-2010, 03:26 PM   #2
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It is quite easy to fabricate a sight glass in-line with your dump valve. All you need is a T, a compression fitting, and a length of polycarbonate tubing.

Everything is available from McMaster Carr


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Old 05-13-2010, 03:29 PM   #3
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Thanks, but I'm really not worried the mechanics of fashioning a sight glass. I'm just curious if anyone thinks it's worthwhile to include a sight gauge at all for the system I've described.

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Old 05-13-2010, 03:33 PM   #4
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It's a handy thing to have but not really essential on a mash tun.

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Old 05-13-2010, 03:53 PM   #5
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So far, I just have one on my HLT on the theory that a sight glass on the MLT or the BK would eventually just get gummed up. Between the MLT and the BK, I'd think putting one on the BK would be more useful (for figuring out when I have enough runnoff to stop sparging).

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Old 05-13-2010, 05:35 PM   #6
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Thanks for posting that Arturo, I know what I'm making this weekend!

Will the polycarbonate tube stand boiling temps?

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Old 05-13-2010, 06:01 PM   #7
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When designing/building my system, I included site glasses in the HLT and BK, but not the MT. I didn't see a lot of benefit and I agree it is just another thing to worry about cleaning. Also not sure how accurate it would be if you end up with grain blocking the input?

My siteglasses are made from polycarbonate tubing and have seen several boil cycles with no negative effects yet.

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Old 05-13-2010, 06:03 PM   #8
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Quote:
Originally Posted by HIM_Tattoos View Post
Will the polycarbonate tube stand boiling temps?

Absolutely
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Old 05-13-2010, 06:06 PM   #9
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Quote:
Originally Posted by HIM_Tattoos View Post
Will the polycarbonate tube stand boiling temps?
So far, I've just been using standard clear plastic tubing and supporting it at the top with an eye-bolt. A rubber gasket around the tube keeps the tube from slumping back through the eye-bolt when it gets hot (this is on the HLT, not the BK, so the temps are a bit lower). Nice thing about this is it's cheap. If it gets dirty, I can just throw it out and replace it.
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Old 05-13-2010, 06:08 PM   #10
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I don't see the point of a sight glass of a mashtun. You're measuring the water before it's going in, what is the point of measuring the same while it's there?
Not to mentions the calibration would need adjusted for each individual grain bill due to absorption.

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