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Old 10-19-2010, 12:49 PM   #1
elproducto
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Default Quick question about measuring OG of first runnings/preboil

I'm about to brew my first AG batch this weekend. I know I should be checking the preboil OG. How do I do this if it's 152 degrees? The hydrometer is calibrated for 68.

Thanks, and forgive the noobness.

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Old 10-19-2010, 12:59 PM   #2
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You just need to cool it down ! usually I put my cylinder full of wort in a tub of cold water.

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Old 10-19-2010, 01:01 PM   #3
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Or get yourself a refractometer with automatic temp control. You are just using a couple drops of wort drawn in a pipette and that takes seconds to cool. You can take as many readings as you need to.

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Old 10-19-2010, 01:13 PM   #4
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Oh man.. NO MORE EQUIPMENT PLEASE

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Old 10-19-2010, 01:16 PM   #5
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Best 30 bucks I've ever spent. It is so much easier to do all grain with it for measuring pre boil, I find myself taking tons of readings to monitor stuff as it goes along.

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Old 10-19-2010, 01:35 PM   #6
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Sounds like a stocking stuffer!

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Old 10-19-2010, 02:36 PM   #7
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I put a small pot in the freezer, then when it's time to measure I take 4oz of wort, swirl it around for a couple minutes, and it's close enough to 70* that I feel I can judge it correctly.

Also, I've heard of people keeping some ice-cold water nearby, and pouring 2oz of wort and 2oz of ice water into your hydrometer flask, take a reading, and then double the result. I don't trust myself to measure this accurately enough, so I use the above method.

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Old 10-19-2010, 02:41 PM   #8
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Measure the temperature first, take a hydrometer reading, measure the temperature again. Perform an OG temperature adjustment using the average of the before and after temperatures.

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Old 10-19-2010, 02:57 PM   #9
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I put the hot wort in a measuring cup and then place the cup in an ice bath. It takes 10 min or so to get the temp down so you can take a reading.

The refractometer with ATC is the most convenient way.

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