The Kiln Sitter and
Limit Timer
WARNING: Since proper operation and
control of the Kiln Sitter and Limit Timer
rest wholly with the operator, we cannot
extend our warranty to cover any dam-
age caused by overfiring regardless of
the circumstances.
DO NOT LEAVE THE KILN SITTER
UNATTENDED!
For the longest life of
your kiln and for safety,
all kiln switches must
be in the OFF position
before the Kiln Sitter
plunger is pushed in.
Pushing in the plunger
with kiln switches on
will result in extra wear
on the Kiln Sitter con-
tact points.
How the Kiln Sitter Works
The Kiln Sitter is elegantly simple and reliable. But it
is subjected to the harsh temperatures and atmosphere
of the kiln and must be adjusted from time to time. This
is easier to do when you know how it works.
A correctly adjusted Kiln Sitter shuts off the power to
your kiln when a properly inserted, small, pyrometric
cone or pyrometric bar sags under the actuating rod.
When the plunger (see photo and diagram) is pressed, a
locking slide holds the plunger down, closing the four
contact points of the Kiln Sitter electrical contacts. The
kiln then receives power. When the cone or bar fires to
maturity and sags, the actuating rod that rests on top of
the cone sags with it. The release claw rises at the same
time, causing the weight on the front of the Kiln Sitter to
fall. The weight unlocks the locking slide, releasing a
plunger. The contact points separate, interrupting the
current to the kiln.
Q
What is the clank-
ing noise that comes
from my kiln when it
shuts off?
A
That is the sound of
the falling Kiln Sitter
weight. The weight re-
leases a switch and
shuts off the kiln.
The Limit Timer is a
clock motor that acts as a
backup safety shutoff. It is
designed to prevent an
4
Setting the Limit Timer.
The Kiln Sitter with the weight in the lowered position.
The Kiln Sitter with the weight in the raised position.