Author Topic: Late Water Adjustment  (Read 1383 times)

Offline a10t2

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Re: Late Water Adjustment
« Reply #15 on: March 05, 2014, 04:24:19 PM »
An ATC function accounts for the probe's variation in pH reading as a result of temperature. It doesn't change the fact that the mash pH itself is also different at different temperatures.
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Offline ccfoo242

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Re: Late Water Adjustment
« Reply #16 on: March 05, 2014, 04:28:06 PM »

An ATC function accounts for the probe's variation in pH reading as a result of temperature. It doesn't change the fact that the mash pH itself is also different at different temperatures.

Is there a formula that does compensate for this or do different grains vary from each other?  Also don't ph probes degrade when used in hot liquids?


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Re: Late Water Adjustment
« Reply #17 on: March 05, 2014, 05:06:45 PM »
Oh and the pH sample was not room temp but the device claims to auto temp correct. It is recently calibrated but I wouldn't swear by it's accuracy.
PH samples are evaluated at room temperature. Autocorrection compensates for the meters error, not changes in the sample with temperature. The probe will last much longer if you measure at cool temps.

Ah! I definitely misunderstood the ATC function then.. that would put it closer to 5.2 then


Actually maybe it was right, just saw this sentence on the calculator:
"This calculator attempts to correct the reading of a pH meter that does not internally account for temperature. If your pH meter features automatic temperature compensation (ATC) or the ability to "dial-in" temperature, it is already internally performing this correction."

Then again 152 may be too high for it to work effectively.

Two things go on with temperature, the meters accuracy. The sample will change. Do you think the meter is made  just for wort, or is it made for any sample that will change with temperature at different reaction rates WRT temperature?

I measure at room temperature, even though my meter has temperature compensation.
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Offline BrodyR

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Re: Late Water Adjustment
« Reply #18 on: March 05, 2014, 05:42:03 PM »
Oh and the pH sample was not room temp but the device claims to auto temp correct. It is recently calibrated but I wouldn't swear by it's accuracy.
PH samples are evaluated at room temperature. Autocorrection compensates for the meters error, not changes in the sample with temperature. The probe will last much longer if you measure at cool temps.

Ah! I definitely misunderstood the ATC function then.. that would put it closer to 5.2 then


Actually maybe it was right, just saw this sentence on the calculator:
"This calculator attempts to correct the reading of a pH meter that does not internally account for temperature. If your pH meter features automatic temperature compensation (ATC) or the ability to "dial-in" temperature, it is already internally performing this correction."

Then again 152 may be too high for it to work effectively.

Two things go on with temperature, the meters accuracy. The sample will change. Do you think the meter is made  just for wort, or is it made for any sample that will change with temperature at different reaction rates WRT temperature?

I measure at room temperature, even though my meter has temperature compensation.


That makes sense, thanks again. I guess the only downside of waiting for your mash to cool is that it gives you less time get a reading and make any needed adjustments for a proper pH.

Offline Steve in TX

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Re: Late Water Adjustment
« Reply #19 on: March 05, 2014, 05:49:09 PM »
A small sample will cool pretty quickly.
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Offline garc_mall

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Re: Late Water Adjustment
« Reply #20 on: March 05, 2014, 06:13:35 PM »
A small sample will cool pretty quickly.

When I need to cool a sample down for refractometer readings (first runnings, pre-boil, post-boil), I take a shot glass, and throw it in the freezer. By the time I fill it with 3 spoonfuls of hot wort, its right about at 65 degrees.
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Offline HoosierBrew

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Re: Late Water Adjustment
« Reply #21 on: March 05, 2014, 06:19:28 PM »
+1.  I add my samples to a small jar with a lid. Two or three minutes in the freezer and it's cooled to ~ that temp.
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Offline BrodyR

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Re: Late Water Adjustment
« Reply #22 on: March 05, 2014, 08:12:36 PM »
+1.  I add my samples to a small jar with a lid. Two or three minutes in the freezer and it's cooled to ~ that temp.

Good idea

Offline erockrph

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Re: Late Water Adjustment
« Reply #23 on: March 05, 2014, 09:39:44 PM »
I take a small spoon and scoop a spoonful into an old White labs vial then drop it in a cup of cold water for a few minutes.
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Re: Late Water Adjustment
« Reply #24 on: March 06, 2014, 09:08:57 AM »
When I need to cool a sample down for refractometer readings (first runnings, pre-boil, post-boil), I take a shot glass, and throw it in the freezer. By the time I fill it with 3 spoonfuls of hot wort, its right about at 65 degrees.

I don't have a freezer nearby, so I use the same method I use for gravity readings.   Put a small sample in  a metal cocktail shaker and swirl it around in a bowl of ice water.  In 30-60 seconds it's down to room temp.
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Offline a10t2

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Re: Late Water Adjustment
« Reply #25 on: March 06, 2014, 09:15:31 AM »
I use a small syringe and pull ~0.2 mL. By the time I walk across the room it's cooled, and there's no concern over evaporation.
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Offline BrodyR

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Re: Late Water Adjustment
« Reply #26 on: March 06, 2014, 09:55:42 AM »
All solid ideas, looking forward to trying it. Hopefully I didn't screw up the probe too much with all my high temp readings.

Offline redzim

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Re: Late Water Adjustment
« Reply #27 on: March 06, 2014, 02:08:36 PM »
I use a small syringe and pull ~0.2 mL. By the time I walk across the room it's cooled, and there's no concern over evaporation.

is this for mash pH or refractometer readings? I thought for a mash pH you would need to pull out an actual "mash sample" including grains, not just liquid... at least that is what I do... or is the pH of just liquid pulled from the tun good enough?

Offline garc_mall

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Re: Late Water Adjustment
« Reply #28 on: March 06, 2014, 03:12:19 PM »
Pretty sure unless it is dissolved, it doesn't affect pH.
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Online Jimmy K

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Re: Late Water Adjustment
« Reply #29 on: March 06, 2014, 05:42:16 PM »
Pretty sure unless it is dissolved, it doesn't affect pH.
That's my guess. Even if the sample includes grain particles, you're still only measuring the liquid that contacts the probe.
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