[APD] Re: pH controller is flipping

[Bill Wichers <billw at waveform_net>]

> Hello all,
> I am currently using the seramic ph controller (produced by 
> sera).  Recently the ph measurements started swinging from 10 to 4 without 
> any reason.  I tried to reinstall the whole thing, using the test 
> solutions and all.  It still isn't working properly.  I suspect the ph 
> probe to be broken and the test solutions outdated as well.
> I'm now trying to fix everything.  The easiest solution would be to go to 
> an LFS and buy a new probe and test solutions but I was wondering if it 
> wouldn't be possible to use another probe (possibly cheaper).  Has anyone 
> any experience with this?
> [snip]
> Thanks
> Pieter Cool

You may want to check for corrosion inside the connector between the probe 
and the controller. Corrosion can cause all kinds of weird problems with 
the small signals the controller sees from the probe.

        -Bill


*****************************
Waveform Technology
UNIX Systems Administrator

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