Author Topic: missing OG by 2-3 points everytime?  (Read 480 times)

Offline dtapke

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Re: missing OG by 2-3 points everytime?
« Reply #15 on: February 11, 2019, 09:52:59 AM »
I'll add to this, i use a pretty massive plate chiller, when i'm done draining my kettle (leaves 4oz behind) I then remove the hose from the kettle, hook an Oxygen tank to it, and crank it up. this pushes all the remaining wort out of my cooler, pump, hoses, etc.

I end up with another 4-6oz of liquid in those remaining hoses and the chiller.

fwiw its a Duda 60 plate 20" chiller. the thing could probably hold 2 gallons by itself if i didn't do that lol.

I'd see if you can find a dip tube, or even custom make one to get to the bottom of that kettle. I'd have a heck of a time worrying about a few gravity points when I'm leaving behind that much.

with the right measurements, these guys could get a diptube and hopstopper that would help you keep more beer in your fermentor and less in the drain:
https://shop.theelectricbrewery.com/collections/hop-stopper
32g eHERMS
Drinking: Cassia Stout, DDHIPA
Primary: Cream ale
Secondary: Dopplebock
Next Brew: Beer. definitely beer.

Offline shaunpycroft

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Re: missing OG by 2-3 points everytime?
« Reply #16 on: February 11, 2019, 10:23:18 AM »
LOL you got it. yes, I misspoke because i was doing a few things at once.

you started at 1.038 and got to 1.045 which would mean you're close to a 3.5L boil off rate. which is a VERY soft boil likely, or your time was off, did you boil for a full 90 minutes for sure?

It was a viorous boil and bang on 90 minutes timed with an ezboil pid. backed up by the laptop running beersmith timer just incase!

Offline dtapke

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Re: missing OG by 2-3 points everytime?
« Reply #17 on: February 11, 2019, 10:28:58 AM »
how are you measuring gravity? hydrometer or refractometer?
is it properly temperature calibrated?


a vigorous boil in a 10-15g pot should boil off 5-7LPH

I get around 10LPH in my 32G electric brewery. Boiling with a 5800w element on full.
« Last Edit: February 11, 2019, 10:33:53 AM by dtapke »
32g eHERMS
Drinking: Cassia Stout, DDHIPA
Primary: Cream ale
Secondary: Dopplebock
Next Brew: Beer. definitely beer.

Offline shaunpycroft

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Re: missing OG by 2-3 points everytime?
« Reply #18 on: February 11, 2019, 10:56:50 AM »
how are you measuring gravity? hydrometer or refractometer?
is it properly temperature calibrated?


a vigorous boil in a 10-15g pot should boil off 5-7LPH

I get around 10LPH in my 32G electric brewery. Boiling with a 5800w element on full.
Its a digital refractometer designed for beer with atc. I factor in the loss to kettle so shouldnt make a difference to the gravity should it?

Offline dtapke

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Re: missing OG by 2-3 points everytime?
« Reply #19 on: February 11, 2019, 01:10:11 PM »
from the start of the boil to the end of the boil the concentration of sugar and volume lost to the air is the only thing changing.

I'd make a minor tweak to boil off rate and see what it gets you, maybe drop from 5 to 4.5/hr and see if you're closer to your numbers on the next run.
32g eHERMS
Drinking: Cassia Stout, DDHIPA
Primary: Cream ale
Secondary: Dopplebock
Next Brew: Beer. definitely beer.

Offline shaunpycroft

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Re: missing OG by 2-3 points everytime?
« Reply #20 on: February 11, 2019, 02:17:24 PM »
Thanks for your help, I will definitely try that and I will treble check my volumes. I do have a sight glass on my kettle and hlt already. I will report back after the next brew! Cheers

Offline dtapke

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Re: missing OG by 2-3 points everytime?
« Reply #21 on: February 11, 2019, 03:40:45 PM »
Never trust sight glasses unless you've verified their accuracy with measured volumes.

My kettle markings are about 2L off
32g eHERMS
Drinking: Cassia Stout, DDHIPA
Primary: Cream ale
Secondary: Dopplebock
Next Brew: Beer. definitely beer.

Offline shaunpycroft

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Re: missing OG by 2-3 points everytime?
« Reply #22 on: February 11, 2019, 11:43:45 PM »
Yeah I agree, I marked my own due to the slightly irregular shape of the keg. Used 1 litre measuring jug at a time.

 

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