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Old 02-06-2013, 01:29 PM   #71
ajdelange
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I found some in a drawer. Photo below. I wouldn't try to keep these things for years. They do change over time. Hach puts expiration dates on theirs (couple of years). Understanding that you can sell more buffer capsules (or anything else) by stating shorter expiry dates and being the cynic that I am I tend to keep them beyond the expiry dates but I wouldn't go into 'years' and I certainly wouldn't use the solutions for more than a single brew or lab experiment. The pHydiron caps are a bit less than a buck apiece from Cole Parmer (and a bit more from Amazon - I think this may be the first time I've seen Cole Parmer the less expensive source of anything but there's a first time for everything). The Hach ones are $0.36 apiece. That's the whole idea behind the caps - that you can have a fresh buffer each time you go to work. Time isn't the only factor - in fact it may not be the main factor. Each time you put the probe into the buffer you are carrying some of whatever was on the probe with it. If you follow the recommendations of the Sticky that will be a very small quantity of DI water but even so you are diluting the buffer with that.

Remember that with a decent meter it will be the buffers that determine the accuracy of your meter. It seems 'penny wise and pound foolish' not to invest a $0.72 a brew (or $1.44 a month - i.e. make new buffers every 2 weeks - if you brew frequently) to be assured of the quality of your pH readings.

It is recognized that if you have a cheapo meter with stability of worse than 0.05 pH over 5 minutes that it isn't necessary to try to keep the buffer pH's within the ±0.02 promised on the label.

Now a question for you readers. How many were eagle eyed enough to note that the label in the photo says that these buffers are 'Directly Traceable to N.B.S. Standards'? That will give you some idea as to how long these have been lying in that drawer. I don't think I'll throw them out. I think I'll keep them around and compare the pH to a fresher buffer.

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Old 02-28-2013, 01:39 AM   #72
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I would like to by a few quantities of a small plastic beaker with lid. Not looking to buy 600 pieces. Does anyone have a source?

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Old 03-07-2013, 10:41 PM   #73
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Quote:
Originally Posted by ajdelange View Post
http://www.hach.com/sample-container...01&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.

The plastic beaker with caps are available for under 2 dollars each form hach. Im going to pick up a few. Would you recommend only using them for so long until replacement?
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Old 04-07-2013, 12:52 AM   #74
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Quote:
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Hello AJ

Is this the correct capsules for the 7.01? I would like to place an order soon!

http://www.hach.com/buffer-powder-pi...?id=7640205050 buffer?
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Old 04-07-2013, 03:25 AM   #75
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Yes.

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Old 04-07-2013, 03:56 AM   #76
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Does hach have an alkalinity kit you would recommend? Unless you can confirm my Taylor pool alkalinity kit will work. It is a titration kit. Not the generic paper strips.

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Old 04-07-2013, 12:33 PM   #77
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Yes, http://www.hach.com/alkalinity-test-...?id=7640219549.

But I also suggest that people consider doing the testing as described at
http://www.wetnewf.org/pdfs/measuring-alkalinity.html mostly if they are interested in understanding the process. That page also illustrates the Hach Digital Titrator which, while it is quite expensive, can also be used for other tests such as hardness and chloride.

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Old 04-07-2013, 02:26 PM   #78
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AJ

Is this good enough for measuring alkalinity? I have this one already.

http://www.taylortechnologies.com/pr...asp?KitID=2471

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Old 04-07-2013, 03:52 PM   #79
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Yes, should be fine. Only does total alkalinity but
1. Your P -alkalinity is probably 0
2. Even if it isn't you don't care as a brewer.

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Old 04-14-2013, 04:27 AM   #80
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I'm brewing a delicate Czech Pilsner tomorrow and needs some help quickly. Need to lower mash ph and still have a positive but yet low biarcarbonate level. I need some assistance from the experts please. Also on a side note I plane on diluting with 50% RO water per the finished water profile attachment.

Also if I need to acidify mash with 7.1 ml of 88% lactic what is the equivalent grams need if using Acidulated Malt?

y13-b2-czech-pilsner.jpg  
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