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Old 02-02-2013, 06:23 PM   #61
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http://www.hach.com/sample-container-120ml-high-pf/product?id=7640237101&callback=qs

They come in a smaller 45 mL size too. Only $0.28 each but you have to buy 600.

Martin: these are great for use with the capsules. Measure in 100 mL or 50 mL DI water (depending on whose caps you have), dump in the powder, close the lid and shake.


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Old 02-02-2013, 11:32 PM   #62
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If you brew twice a month do you use the same buffer sample that is mixed and stored in the plastic beaker with cap?



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Old 02-03-2013, 03:59 AM   #63
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I mix new buffer (from the capsules) each time I brew. I would guess 2 weeks for buffer from a stock bottle would be OK (except for pH 10 which you aren't going to be using in brewing anyway).

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Old 02-03-2013, 12:35 PM   #64
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I actually reuse 2 oz of the buffers in 4 oz bottles. every 6 month I replace it with stock pH buffer solution. The drift over the 6 months is never more than 0.02. Having the pH buffer in small bottles also makes it easier to heat it to 25 C.

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Old 02-04-2013, 02:28 AM   #65
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Originally Posted by j2bink View Post
I purchased the Milwaukee 250ml buffers for 4.01 and 7.01. I was thinking about what is the best way to prepare the buffers for calibration. I'm thinking about getting 50ml beakers to use. I would like to know if there is a minimal volume of buffer required to properly calibrate the meter and does my buffers require to be mixed with DI? I assume no mixing is required since no instructions are printed on the bottle. Please review the attachment. Thanks
Are these buffers premixed and ready to calibrate? Where do you buy the capsules that alot of people are using?
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Old 02-04-2013, 06:43 PM   #66
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Yes, the bottles contain pre-mixed liquid buffer.

For the capsules:

http://www.hach.com/buffer-powder-pillows-ph-4-01-nist-color-coded-red-pk-50/product?id=7640204347&callback=qs

http://www.coleparmer.com/Product/Buffer_capsules_pH_4_0_orange/EW-05977-12

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Old 02-04-2013, 08:16 PM   #67
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I picked up my capsules on Ebay
http://www.ebay.com/itm/pHydrion-Buffer-Capsules-1-Vial-10-Capsules-pH-4-/310583337817?pt=LH_DefaultDomain_0&hash=item485035 a359

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Old 02-05-2013, 11:08 PM   #68
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Quote:
Originally Posted by j2bink View Post
I purchased the Milwaukee 250ml buffers for 4.01 and 7.01. I was thinking about what is the best way to prepare the buffers for calibration. I'm thinking about getting 50ml beakers to use. I would like to know if there is a minimal volume of buffer required to properly calibrate the meter and does my buffers require to be mixed with DI? I assume no mixing is required since no instructions are printed on the bottle. Please review the attachment. Thanks
Are these buffers premixed and ready to calibrate? Where do you buy the capsules that alot of people are using?
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Old 02-06-2013, 01:27 AM   #69
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Martin. Can you post a pick of your capsules. What to see what size. Thanks.
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Old 02-06-2013, 12:41 PM   #70
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Martin. Can you post a pick of your capsules. What to see what size. Thanks.
They are 'horse pill' sized capsules. You add them to 100 mL of distilled water. That should last me about 6 months, so the 10 capsules should last many years and they won't go bad like pre-mixed solution will (it absorbs gases and contaminants from the air).


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