Tom Buck on tue 6 aug 02
Brian & Doc:
Engineer Rajotte is surely correct when he says a pryometer probe
will degrade in time and become less accurate (or fail entirely) even when
surrounded with a ceramic shield.
the business end of the probe is a junction of two different
metals (aka bimetallic junction). and these metals, like most we encounter
in kiln work, will slowly (very very slowly) evaporate because of the heat
input, and at some point, the junction breaks and hence no more working
probe. also, as the two metals leave the junctiom ever so slowly, they
cause a slow change month by month in the tiny current flow generated by
the bimetallic junction ... it is a function of the differing atomic
behaviour of the two metals.
later. Peace. Tom.
Tom Buck ) -- primary address.
"alias" or secondary address.
tel: 905-389-2339 (westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street, Hamilton ON L8T 3E1 Canada
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