The thermo-controller on my electric burnout kiln kicked the bucket.
Its made by A.L. Engelhardt and I couldn’t find any info on it any
where. It has a pyrometer that presumably moves a puchrod up and
down, which in turn operates a pressure switch to turn the kiln on or
off based on what temp you set using the indexing screw at the top.
Its all mechincal and a finicky little thing. used to work great
until recently. Now, the movement of the pyrometer (thermo
expansion/contraction maybe?) either doesn’t work itself, or the
mechanics involved in transferring that subtle motion to the pressure
switch assembly have too much friction, degraded, fallen out-o-spec,
etc. so that thetemp of the kiln no longer drives the operation of
the switch. I disassembled it only very slightly, but putting it back
together, it doesn’t seem to behave as before. I’m looking for any
help of any kind! Also, any ideas on how to test it and/or calibrate
(temp) would be welcome. In fact, any ideas on a cheap replacement
are welcome too!
Here are some pictures
Thanks so much!