1616 S Spencer Ave.
Indianapolis IN 46203
|Dawson Kiln Sitter
w/ Limit Timer
Mechanical Kiln Shutoff
Supplied as standard equipment on all Evenheat Classic, TnB and Fyrematic series kilns (save a few smaller models) and the Good Kiln Blue and Red series.
See below for further discussion
Sitter and how it Works |
Kiln Sitter is a mechanical device which removes power to the heating
elements once the proper kiln temperature has been reached. The
user sets a small pyrometric cone onto the Kiln Sitter cone support.
The cone you place onto the support is formulated to bend when the
kiln reaches a certain temperature. You can use a specific cone
that bends at a given temperature. When you turn the kiln on and
the temperature rises, the cone will bend at its rated temperature.
A rod that is laying on the cone pivots and causes a lever to drop,
turing the kiln off.
What Kilns Use a Kiln Sitter?
Evenheat produces three series of kilns that include the Kiln Sitter
as standard equipment: The Classic, TnB and Fyrematic series. Good
Kilns produces the Blue and Red series kilns which include the Kiln
Sitter. In each of these series the kilns contain controls which
regulate and control the heat with the Kiln Sitter shutting off
power to the elements at the proper time.
Does the Kiln Sitter Control the Heating?
No. The Kiln Sitter simply removes power from the heating elements when the proper temperature is achieved. It has no other function.
What precautions should I take?
One important thing to remember is that the kiln sitter system is not fool-proof. For that matter, the computerized kilns can also malfunction. You must never leave a kiln unattended while it is firing. Never leave the room nor sleep when the kiln is on. Loose wiring can cause a fire. Wiring may work its way loose over time because of heating/cooling. Check the connections once per year.
A kiln that does not shut off when it is supposed to can cause what is called a meltdown. All of the ceramic or glass items in your kiln litterally melt and stick to the kiln shelf causing everything, including the shelf, to have to be thrown away. Know when the kiln is supposed to shut off. If it does not shut off after one hour beyond when it was supposed to, turn it off manually.These are the usual causes for an over-fire
What is the Limit Timer For?
The Kiln Sitter contains a device known as a Limit Timer (round
knob shown above on Kiln Sitter faceplate). The role of the limit timer is to remove power from
the elements after a certain period of time. This is what may be
called a "back up" in the event of Kiln Sitter failure. The limit
timer should never remove power during normal operation. On some
kilns the limit timer is an option.
Can I Use any Pyrometric Cone in the Kiln Sitter?
No. Only those cones designed for use in the Kiln Sitter should be used. These include the small Orton cones, which are available in different temperature bending varieties.
© 2006 Indiana Ceramic Supply, Inc.
This page last updated on 01/04/2012