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Kiln Sitter Back-Up Safety Option
For high limit back up of automatic kilns
- This option includes an Orton Sitter/Timer.
- It acts as a redundant back up control mechanism for your automatic control.
how does it work
- The Sitter/Timer breaks the common of the contactors so that all contactors are turned off if the Sitter/Timer shuts off.
- The typical operation is to put a cone in the Sitter/Timer that is one to two cones higher than what you will be firing to.
- The Sitter/Timer will provide an extra measure of security by being there to shut off the kiln in the event that the automatic control fails to shut off properly.
- Some people use this as the final control device. They set the program control to fire higher than the cone they put in the Sitter/Timer.
- If you do not want to use the timer it can be easily disconnected from the circuit.
Note about timer
Having the timer is another back up system. However, In some cases the Sitter/timer will interfere with the operation of the Dynatrol Controller. Specifically the hour Timer on the Sitter/Timer only goes up to 20 hours. Often it is desirable to run the kiln for longer than 20 hours, or to use the Delayed Start feature in the DynaTrol, making it necessary to reset the timer every 20 hours. You can easily disconnect the wires to the timer to prevent it from timing out if this is an issue with how you are going to use this back up system.
Any kiln can still overfire. It is strongly advised that an operator should be present when the kiln is supposed to shut off.
To use the Sitter/Timer, a cone should be placed on the cone supports at the end of the tube. The sensing rod should rest on the top of the cone. Meanwhile, at the front of the sitter, the lever should be raised to the upright position. There is a claw at the end of the sensing rod at the front of the sitter. This claw is used to hold the lever in the upright position. The sensing rod must be on top of the cone, and at the same time, the claw must be gripping the lever. If both of these are not positioned correctly, the sitter will not operate properly. Once the claw and sensing rod are positioned correctly, the white power
button can be pushed in.
Once the cone melts at the end of the tube, the sensing rod will fall through the cone, which will raise the claw that is holding the lever up at the front of the sitter. When the claw releases the lever, it will fall and shut the kiln off. If the timer runs out before the cone melts, the kiln will shut off. Because of this, it is a good practice to over estimate the time of the firing to avoid early shut-off. Using the Sitter/Timer as a backup will ensure that when the cone melts at the end of the tube; the kiln will shut off, regardless of
the temperature on the kilns' display. The timer wheel must be turned clock-wise in order for the white power button to pushed in.