Laura Vandenbogaardt on tue 9 oct 01
I just acquired an Omega HH-22 digital pyrometer with a K thermocouple and
have no idea how to install it into my old Skutt kiln. Where is the best
entering place for the thermocouple: through a peephole, through the top...(I
have that silver looking shell all around the outside, except for 4 or 5
peepholes--one is left open)? Where is the best place to put the thermocouple
inside the kiln (on a shelf, on the wall, away from elements)? Do I need a
mounting device to hold it in place? What about a protective tube for the
thermocouple? Do I need to coat the thermocouple with some type of spray?
I appreciate all the help I can get.
Laura
Arnold Howard on tue 9 oct 01
--- Laura Vandenbogaardt wrote:
> I just acquired an Omega HH-22 digital pyrometer with a K
> thermocouple and
> have no idea how to install it into my old Skutt kiln. Where is
> the best
> entering place for the thermocouple: through a peephole, through
> the top...
I haven't used the Omega HH-22. My answers below are general:
The thermocouple should be installed on a wall half way up from the
bottom.
(I
> have that silver looking shell all around the outside, except for
> 4 or 5
> peepholes--one is left open)?
You could also use a drilled peephole plug (if available for your
kiln) to install the thermocouple in a peephole.
Where is the best place to put the
> thermocouple
> inside the kiln (on a shelf, on the wall, away from elements)?
The entire thermocouple should not be placed inside the kiln. The
only part of the thermocouple that extends into the firing chamber
is the tip. Ordinarily, the tip should extend into the firing
chamber by the width multiplied by four. (i.e. 1/4" diameter
thermocouple should extend into the firing chamber 1".)
> Do I need a
> mounting device to hold it in place?
You do not need a mounting device for a thermocouple used with a
pyrometer. Drill a hole into the kiln's sidewall and slide the
thermocouple into the hole. Avoid drilling the hole into an element
groove.
What about a protective
> tube for the
> thermocouple?
If the thermocouple is the exposed type, you might want to use a
ceramic protection tube.
Some people insert the thermocouple only when they take temperature
readings, then remove it. That makes the thermocouple last longer.
Do I need to coat the thermocouple with some type
> of spray?
> I appreciate all the help I can get.
> Laura
Arnold Howard
Paragon
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Dave Finkelnburg on tue 9 oct 01
Laura,
You can drill a hole any place you want, as long as you avoid the
elements, which means drill from the inside out.
If you want to install the thermocouple in a peep hole, you need to seal
around the thermocouple to keep out air that will give a false reading. I
have done this using some porcelain paperclay pressed around the
thermocouple, then put into the peep hole to match the taper there. Then,
with the firing shrinkage, the taper still fits tight.
Hope this helps,
Dave Finkelnburg
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