evoo4u
Well-Known Member
Long story, but I have a new Hanna 98128 surplus to requirements - $150 (including some sachets of calibration solution)
I've been using my original 98128 for a couple of years, but recently couldn't successfully calibrate it. It rejected the 7 solution. I changed the electrode over with an old one, and then it accepted the 7, but rejected the 4.
Getting a bit cheesed off, and suspecting that moisture may have got in past the o-ring on the electrode shaft and played havoc with the electronics, I ordered a whole new meter and a spare electrode as well.
The new electrode solved the problem! A Hanna techie also told me that testing for pH in hot solutions was severely detrimental to the life of the electrode, and to restrict temps to <30C*. I had been abusing the electrode by measuring at mash temps!!! Now (poorer but wiser) I draw off a sample of the hot mash, cool it, then take the reading.
So that leaves me with my original pH meter, now working well again, but also a new and unused 98128 if you're interested. New price is around $200 I think.
* The specs indicate the temp range from -5C to 60C, but it seems at the expense of the electrode's longevity!
I've been using my original 98128 for a couple of years, but recently couldn't successfully calibrate it. It rejected the 7 solution. I changed the electrode over with an old one, and then it accepted the 7, but rejected the 4.
Getting a bit cheesed off, and suspecting that moisture may have got in past the o-ring on the electrode shaft and played havoc with the electronics, I ordered a whole new meter and a spare electrode as well.
The new electrode solved the problem! A Hanna techie also told me that testing for pH in hot solutions was severely detrimental to the life of the electrode, and to restrict temps to <30C*. I had been abusing the electrode by measuring at mash temps!!! Now (poorer but wiser) I draw off a sample of the hot mash, cool it, then take the reading.
So that leaves me with my original pH meter, now working well again, but also a new and unused 98128 if you're interested. New price is around $200 I think.
* The specs indicate the temp range from -5C to 60C, but it seems at the expense of the electrode's longevity!
