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Old 03-11-2014, 03:53 AM   #1
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Default Stability check Hach Pro+

I did my first stability check about 3 months ago. Based on my last post I redid it tonight. Here are my results, not sure if this is good or not. I did notice more variability this time especially with minor changes in temp of the sample. Time is counting down from 1 hour 30 minutes.
1:30 4.0 at 75.4 (I had just calibrated it)
1:27 3.99 at 74.8
1:23 3.97 at 74.7
1:20 3.97 at 75.2
1:11 4.01 at 75.6
1:07 4.00 at 75.2
:56 3.93 at 73.9
:50 4.00 at 75.7
:49 4.01 at 76.1
:37 4.03 at 75.7
:35 4.01 at 75.6
:32 4.01 at 75.2
:26 4.07 at 77.2
:20 4.12 at 77.7
:18 4.00 at 75.6
:13 3.98 at 75.4
:11 3.95 at 75.2
:9 3.95 at 75.0
0 3.90 at 74.3

Does this mean the meter is still functioning correctly or does it mean it is starting to have a problem? Thanks for your help in advance

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Old 03-11-2014, 05:27 PM   #2
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You definitely have a problem there. All I can suggest at this point is that you fill the cap with buffer (4 or 7), store overnight, recal and recheck stability. If it isn't more like what you saw when you first got the meter then I think you should contact Hach and see what they have to say. It shouldn't go south like this after 3 mos.

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Old 03-12-2014, 01:22 AM   #3
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Thanks for the reply AJ. I called Hach and they are sending me some cleaning solution for free. I will try that and go from there.

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Old 03-24-2014, 03:58 PM   #4
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I just wanted to let you know I had a sort of similar problem yesterday. It had been a couple of months since I used it last. I couldn't get a reading at all but instead got the ----- display which means the probe needs to be cleaned. So, it was way out of wack. That was just the beginning of my frustrations though.

The temperature was also really unstable so I took the batteries out and put them back in a couple of times just to see if it did anything and on one of those times I accidentally put a battery in backwards. In about a minute I noticed the unit getting really hot and the face plate was bubbling out! It was toast. I was so mad at myself. I sent them an email telling them what happened and they said it was under a 6 month warranty and they would replace it!

I'm very happy with their customer service. I was probably just going to give up on ph meters if I had to buy a new one. From now on I'll keep some probe cleaner on hand and be extremely careful when replacing batteries.

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Old 03-25-2014, 03:07 AM   #5
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Interesting and unfortunate (as far as the meter goes). I have also had great customer service so far. They sent me some free cleaner (which didn't fix the problem) and some free pillow buffers. I used the cleaner per the manual instructions but it didn't help. When I tried to recalibrate it read the 7.0 buffer as 4.93-5.02 and would never let me move on from there. They are now sending me a free replacement probe. I hope this works. Frustrating for sure but at least the customer service has been good.

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Old 03-25-2014, 04:16 AM   #6
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Two guys with failures in less than 3 mos. doesn't bode well.

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Old 03-25-2014, 01:11 PM   #7
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How are you folks storing your probe? I've got to believe that keeping the bulb submerged in an appropriate KCl storage solution helps. I'm approaching 2 years old for the probe on my meter and its only shifted slightly in the calibration settings and the response is still fast. I do suspend the probe in 0.1M KCl solution that I made with an expired bottle of 4 buffer solution.

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Old 03-25-2014, 02:30 PM   #8
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Took a peek at this meter and I see they recommend conditioning it for first use. Manual states to use tap water. Could this be a possible source of issue?

Last time I got serious about getting a meter again I was looking at an investment nearly the same as the meter itself for buffers and storage solution. Am I off?

I have owned 3 meters and have learned immensely from them and with each new meter I learned more about using them but I am enjoying brewing sans meter thanks to bru'n water...

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Old 03-25-2014, 02:43 PM   #9
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I have kept mine stored with storage solution from Hach. I called them twice when I first got it and they said you could store it dry but that it would last longer with the storage solution.

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Old 03-25-2014, 07:26 PM   #10
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We will hope, that as is often the case, there are initial production run problems with this new meter. If not we'll have to relegate it to the pile of 'bitterness of poor quality remains long after the sweetness of low price is forgotten' cheapo meters.

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