John Baymore on thu 24 sep 98
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=3Csnip=3E
I like your idea of using a latching relay such as a motor starter switch
better.
=3Cclip=3E
Roger,
I tend to agree for most craft type installations. I think once the kiln
goes down for any reason it should go completely down and require an
operator to perform a restart. Annoying.....but the safest way to set
things up given the realities of most craft studios. Unless you go to some
pretty elaborate flame safety and automation equipment that is more the
province of the industrial operation (read big =24).
The problem with a latching relay wired directly into the AC supply line
(as opposed to being driven by more elaborate electrionics) however is that
extremely short term inturuptions of AC will cause it to drop out and stay
out. A 1 second power failure or severe brownout will usually cause it to
shut the system down, whereas a 110-120 VAC solenoid valve directly hooked
to the AC without the relay will cycle back on in such a scenario, and the
flame will probably never even have gone out.
More sophisticated electronics can be used to set a minimum duration for
power fluctuations, but that is beyond the simplicity most potters are
looking for.
Oh well....... trade offs.
The most important component of the =22flame safety=22 system is the full =
and
undivided attention of the kiln operator. I always strive to keep that
foremost in the minds of my clients =3Cg=3E.
Best,
.......................john
John Baymore
River Bend Pottery
22 Riverbend Way
Wilton, NH 03086 USA
603-654-2752
JBaymore=40Compuserve.com
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