Steve,

Here is Hanna Canada's tech support page:

http://www.hannacan.com/divisions_en.html

You can also email tech support with the model and issue description
too, they are very helpful and very prompt.

Before you solder the leads, try cleaning the connections with a red
rubber eraser (not a pen eraser, use a pencil eraser, they are less
abrasive)

The electrode is a very high impedance and a little corrosion or dirt
can cause issues. Mine was never very stable, but I would not give up
on yours until I cleaned it, heard back from Hanna and soldered it as
a last resort.

Remember to clean off all the rosin if you solder, use rubbing alcohol
followed by grain if necessary. (I'm a component level instrument
repairman.) The easiest way to get rosin off is to take an acid brush
and snip off most of the bristle length, leaving about 1/4" of
bristle. Wet and scrub the connections, it comes right off. If the
humidity is high you may get a white film, just keep wiping it off and
follow up with grain if need be.

Hope that helps.
Joe











"ss" -ag> wrote in message >...
> OK - I don't want to make a long story longer - but here goes.
> I have a Hanna Piccolo - its been fine for about 3 years . I store it in
> storage solution.
> I have recently cleaned it with a cleaning solution. I also replaced the
> batteries.
> It calibrates fine at 7.00ph and at 4.00ph. It measures wine ph fine.
> ... but when I try to use it to measure TA - i add NaOH solution in drops
> and watch the
> ph rise until it reaches 7.23 - above which it will not register - no matter
> how much NaOH I add.
> This is a recent development - and it worked fine on my last batch of wine
> in September.
>
> So the question is - does this behaviour sound familiar?
> - is the electrode pooched?
> - are there any homegrown mixtures of high ph - ie. alkaline which I could
> calibrate or at least check over 8.0
> - Finally Tom S you mentioned you didn't like the probe-to-meter contacts
> (agreed) and that you soldered them. - Well my _other_ hobby is diy tube
> amps - so I have the tools to solder - but I would love to see a picture of
> what you did to your Piccolo - because maybe I just have a contact issue?
>
> Steve in Vancouver
> PS - this is a thanks upfront to Tom S for all the contributions to the NG.
> Even if you don't get around to this little post - your support to this NG
> is ongoing and virtually without peer - and I often include your moniker as
> part of my google searches through this NG.