Author Topic: Hydrometer reading and trub in the tube  (Read 899 times)

Offline Virwill

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Hydrometer reading and trub in the tube
« on: February 03, 2019, 10:25:42 PM »
Hi, all. Just brewed a partial extract IPA w/a mix of whole and pellet hops. All looked good except I didn't hit my original gravity, 1.066. Hydrometer reads 1.057; temp corrected, it's 1.059. I'm wondering if trub in the bottom of my sample tube could affect the reading. I poured the cooled wort through a sanitized strainer but took a sample before it settled, and there's about an inch of trub in the bottom. Could that affect my reading? 

Offline Pope of Dope

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Re: Hydrometer reading and trub in the tube
« Reply #1 on: February 04, 2019, 05:10:06 AM »
It should not affect the reading. I've had instances where there was a lot of trub and this did affect the reading, despite general advice dictating that it should not.
Generally you don't see that kind of behavior in a major appliance.

Offline Bob357

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Re: Hydrometer reading and trub in the tube
« Reply #2 on: February 04, 2019, 09:24:30 AM »
Unless the wort is saturated with break material and hop matter the reading should not be affected. If your hydrometer was sitting on a dense layer of trub in the sample tube the gravity would read high, not low.
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Offline Virwill

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Re: Hydrometer reading and trub in the tube
« Reply #3 on: February 04, 2019, 11:28:12 AM »
Thanks, gents. 

Offline denny

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Re: Hydrometer reading and trub in the tube
« Reply #4 on: February 04, 2019, 03:08:00 PM »
Did you happen to do a partial boil and add top up water afterward?
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Offline rburrelli

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Re: Hydrometer reading and trub in the tube
« Reply #5 on: February 04, 2019, 04:45:40 PM »
Was that a pre or post boil gravity reading?
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Offline Virwill

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Re: Hydrometer reading and trub in the tube
« Reply #6 on: February 25, 2019, 12:33:35 PM »
Did you happen to do a partial boil and add top up water afterward?

Yep.

Offline Virwill

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Re: Hydrometer reading and trub in the tube
« Reply #7 on: February 25, 2019, 12:34:45 PM »
Was that a pre or post boil gravity reading?

Post-boil, cooled.

Offline denny

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Re: Hydrometer reading and trub in the tube
« Reply #8 on: February 25, 2019, 02:47:21 PM »
Did you happen to do a partial boil and add top up water afterward?

Yep.

Then that's likely the issue.  When you tool off, the wort is heavier than the water and sinks to the bottom.  When you take a reading you get the watered down wort on top.  Don't sweat it.
Life begins at 60.....1.060, that is!

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