Paul B on mon 5 dec 05
A friend of mine has an oxyprobe that has not been serviced in years and
has not been used for a while so he let me borrow it, but i could not get a
reading from it. So after the kiln had totally cooled down i took off the
protective cover and the wire basically just disintegrated. So it needs a
new wire, expensive enough at $12/INCH but then even more to have axner fix
it, they said about $200 total, and the technician there said every time he
sent a wire out to a do-it-yourselfer potter it always came back to him.
Has anyone actually repaired one of these things - is it really that hard
to do? Does anyone know what that wire is called and if i can get it
cheaper somewhere else?
With all the industrial skills i have learned i find it hard to believe
this would be beyond me - but if someone out there with experience tells me
it is then i will believe them. If i can fix the thing then i can use it
for a few firings, if not i will have to give it back and it will sit for a
long time before it gets fixed.
thanks,
Paul
Hank Murrow on mon 5 dec 05
On Dec 5, 2005, at 9:23 AM, Paul B wrote:
> A friend of mine has an oxyprobe that has not been serviced in years
> and
> has not been used for a while so he let me borrow it, but i could not
> get a
> reading from it. So after the kiln had totally cooled down i took off
> the
> protective cover and the wire basically just disintegrated. So it
> needs a
> new wire, expensive enough at $12/INCH but then even more to have
> axner fix
> it, they said about $200 total, and the technician there said every
> time he
> sent a wire out to a do-it-yourselfer potter it always came back to
> him.
> Has anyone actually repaired one of these things - is it really that
> hard
> to do? Does anyone know what that wire is called and if i can get it
> cheaper somewhere else?
Yes, I have had thesame problem with the OxyProbes on my Doorless
Fiberkilns. The problem occurs because the outer return wire is exposed
to the reduction atmosphere. The long term cure is a .5" alumina tube
which extends just beyond the oxygen sensor about 3/8" . The wire is
replaced to the point where it is still malleable. The fix is a welding
of the new and the old wire(delicate business), which can be done by
any real jeweler with his/her torch. You do need to study how the wire
was wrapped around the end of the oxy sensor and replicate that. If it
is any comfort, the damage was done long before you handled the device.
> With all the industrial skills i have learned i find it hard to believe
> this would be beyond me - but if someone out there with experience
> tells me
> it is then i will believe them. If i can fix the thing then i can use
> it
> for a few firings, if not i will have to give it back and it will sit
> for a
> long time before it gets fixed.
> thanks,
> Paul
>
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www.murrow.biz/hank
Ivor and Olive Lewis on wed 7 dec 05
Dear Paul B=20
If the repair involves welding, this may need the use of an Oxy Hydrogen =
torch. I recall at Hadfields, all thermocouples repaired in the Pyro Lab =
were welded with this tool. A twist of the wires will not work on a =
permanent basis though, when preparing specimens, I would cut a slot in =
the steel and crimp the platinum wire in place. This gave a good =
temporary contact.=20
Best regards,
Ivor Lewis.
Redhill,
South Australia.
=20
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