Kiln Sitter P Manuale utente
OPERATING
MANUAL
MODELS P & K
CAUTION
The KILN-SITTERcontrol is a valuable tool to help
you achieve consistent result when firing your kiln. It is
engineered to give you years of trouble-free
performance when it is kept in proper adjustment and
maintained as described in the KILN-SITTER
Operating Manual.
The KILN-SITTERcontrol is NOT intended to
perform as a fail-safe shut-off device and your kiln
should NOT be left unattended beyond the estimated
firing time. An uncontrollable accident, such as
greenware falling against the end of the KILN-
SITTERtube, might cause an over-firing which could
damage your kiln. In this event, the operator should be
in attendance to shut off the kiln manuall
y
.
WARNING
DO NOT FIRE YOUR KILN OVER OR NEAR FLAMMABLE
MATERIAL (i.e. wood floor, carpeting, etc.) SEE KILN
SITTER Limited Warranty.
1
KILN-SITTER
OPERATING MANUAL
Thank you for choosing the KILN-SITTERcontrol on your ceramic kiln. You, like
ceramists the world over, can now enjoy your hobby more because the KILN-SITTER
is "watching" your kiln while you do other things. Years of trouble free firing are yours to
enjoy if you will take the time to carefully read the kiln operating instructions and KILN-
SITTERmanual.
The KILN-SITTERis a mechanical control that fires your kiln by the TIME and
TEMPERATURE method of heat treatment using a small cone or bar. The cone or bar,
after being exposed to the proper time and temperature, softens and bends to a pre-
determined angle, shutting off the kiln. Your choice of cone or bar, proper KILN-
SITTERadjustment and tube position determine when the kiln will shut off.
The KILN-SITTERrequires very little attention but may need an occasional
adjustment check and replacement of critical parts such as the tube assembly, cone
supports or sensing rod. Frequency of replacement depends on the type of firing being
done, type of clay used, venting and the moisture content of the pieces being fired.
To insure that your KILN-SITTERis properly adjusted, we suggest
you follow the instructions on the following pages and test fire your
empty kiln with the KILN-SITTERbefore you do anything else.
2
3
Adjustments
Even if your KILN-SITTERwas adjusted at the factory, it could have been jarred out of
adjustment during shipment or delivery. Let's first be sure the KILN-SITTERis in
proper adjustment before using.
Here are some simple adjustment checks for you to make before firing your kiln. We
urge you to make them carefully and repeat this check every 30 firings during its
lifetime.
1. TURN ALL SWITCHES OFF
2. INSTALL FIRING GUAGE
3. CHECK POSITION OF RELEASE CLAW AND WEIGHT TRIGGER
a. With the firing gauge in position, swing the weight up against the guide plate. Pull
the claw forward (against the slight play in the swivel/pivot assembly) and check for
a 1/16th-inch clearance between the inside tip of the claw and the face of the trigger
as shown in Figure 2. The set screw on top of the claw may be loosened if the
adjustment of the claw position is necessary. Retighten the set screw firmly.
Normally the firing gauge is in position
when your kiln is shipped from the factory
(held by a rubber band at the end of the
KILN-SITTERtube.) If it has been
removed, it should now be replaced ove
r
the sensing rod and cone supports, as
shown in Figure .
CAUTION : Remove firing gauge before
operating kiln.
4
Check your kiln with a level to make sure it is not standing on an uneven floor. If this
should occur, your weight may not fall when released.
4. CHECK THE TRAVEL OF THE SENSING ROD
THE FIRING GUAGE SHOULD NOW BE REMOVED BUT KEPT FOR FUTURE
PERIODIC ADJUSTMENTS. The sensing rod is now free to travel vertically within
the tube cavity. It should travel freely in the center of the cavity without touching
the sides at any point, as shown in Figures 5 and 6.
When these adjustments have been made, you are ready to test fire.
b. When the weight swings
forward, the trigger should
j
ust clear the tip of the claw,
as shown in Figure 3. The
setscrew in front of the
weight may be loosened to
raise or lower the trigger, as
shown in Figure 4. The
setscrew must be firmly
tightened or the force o
f
repeated falling of the
weight may cause the
trigger to creep out o
f
adjustment.
WARNING: Do not fire your kiln over or near FLAMMABLE material (i.e. wood floor,
carpeting, etc.)
If necessary, the sensing rod may
be centered by loosening the two
guide plate screws in front of the
KILN-SITTERand moving the
guide plate right or left as required,
as shown in Figure 7. Be sure the
guide plate screws are firmly
tightened.
5
TEST FIRING
Firing tests are made with the kiln empty. Two small size cones, which mature at a
relatively low temperature, are provided with the KILN-SITTERfor test firing. This
allows you to complete the test firing in the shortest possible time. Additional cones are
available from your dealer.
1. FIRING GAUGE HAS BEEN RMOVED.
2. APPLY KILN WASH
(A small nail polish bottle with brush is ideal for this purpose.) Mix Hi-Fire kiln wash
with water to a creamy solution. Apply a THIN coat to the cone supports and the
sensing rod where they will come in contact with the cone. Do not apply kiln wash
to the cone or to the end of the porcelain tube. Allow wash to dry thoroughly. Do
not allow kiln wash to accumulate.
3. RAISE WEIGHT UP AGAINST GUIDE PLATE.
4. PRESS CLAW DOWN LIGHTLY UNTIL IT ENGAGES TRIGGER.
5. INSERT CONE (SEE PAGE 7, Item 7.)
While holding the claw down over the trigger, carefully place one of the test cones
flat on the cone supports with the inside edge of the number circle even with the
outside edge of the cone support. See Figure 8. The cone should be back against
the metal step of the cone support with the center of the cone parallel with the end
of the tube.
CAUTION: Since the softening and bending of the cone shuts off your kiln, its
correct positioning is important for proper firing. IF THE CONE IS DISLODGED BY
ACCIDENT OR ALLOWED TO COME IN CONTACT WITH THE PORCELAIN
TUBE, AND OVER-FIRING MAY RESULT WHICH COULD CAUSE SERIOUS
DAMAGE TO YOUR KILN
The cone now holds the claw engaged so that the weight is supported and your hands
are free. You are now ready to close the kiln and begin the test fire.
6
6. TURN ALL SWITCHES OFF.
7. INSERT A FINBER INTO THE HOLE IN THE WEIGHT AND PUSH FIRMLY IN ON
THE PLUNGER UNTIL IT LOCKS.
8. FIRE THE KILN BY USING THE REGULAR KILN SWITCHES, AS INSTRUCTED
BY THE KILN MANUFACTURER. (For purposes of test firing, when the kiln is
empty, the highest temperature setting may be used.)
In approximately one hour the KILN-SITTERweight will drop, shutting off the kiln.
When the kiln is cool enough to handle you may open it and inspect the cone. If all
adjustments have been made correctly, the cone on the KILN-SITTERwill be bent to
an approximate 90-degree angle shape similar to the illustration in Figure 9. However, if
it is bent similar to the "over-fired" illustration, reduce the kiln switch settings. This will
increase the firing time, reduce the rate of climb and allow the cone to mature properly.
The best way to verify that your load is reaching a certain firing treatment is by using
witness cones. These are valuable and inexpensive instruments that reliably measure
actual firing performance. Witness cones are optional but we recommend their use
during test firing and also periodically during normal operations, as a check for
consistent firing performance, For information on witness cones, refer to page 9.
You are now ready to begin normal firing operations.
7
NORMAL OPERATION
It is the responsibility of the KILN-SITTERuser to become familiar with the proper
operation and adjustment of the KILN-SITTER. If the simple steps and precautions,
outlined in this manual, are followed with care, it will serve you as a valuable and
reliable instrument for greater success and enjoyment in your ceramic firing.
When you have assured that the KILN-SITTERis in proper adjustment by test firing,
as described in that section, you are ready for normal firing operation.
1. CHECK THE SENSING ROD
Before each firing check the sensing rod for free and
centered travel. See Figure 10. In spite of
precautions, the swivel/pivot of the tube
assembly can become corroded or contaminated
and alter the normal shut off. If the sensing rod
moves sluggishly, does not fall freely or you have
inconsistent firings, immediately replace the tube
assembly. Refer to pages 12 through 14.
2. TURN ALL KILN SWITCHES OFF
The life of the KILN-SITTERswitch will be increased if kiln switches are off
before engaging the KILN-SITTER
3. APPLY KILN WASH
Apply a THIN coat of Hi-Fire kiln wash to the cone supports and sensing rod where
they will come in contact with the cone. Allow the kiln wash to dry thoroughly. We
suggest two pair of supports be available. This allows you to prepare a clean pair
while the other pair is being used in the firing. Refer to page 11; Care of Cone
Supports.
4. STACK WARE IN THE KILN
When loading your kiln, care should be taken to keep the KILN-SITTERtube,
cone supports, and cone or bar visible from above at all times. If the tube is
covered from view, the cone or bar could accidentally be dislodged from its proper
position without being noticed and cause a malfunction of the KILN-SITTERshut-
off. Shelves and ware should be positioned at least an inch above or below the
KILN-SITTERtube so that the normal shut-off function will not be obstructed.
5. RAISE THE WEIGHT UP AGAINST THE GUIDE PLATE
6. PRESS THE CLAW DOWN LIGHTLY UNTIL IT ENGAGES THE TRIGGER
8
7. INSERT THE CONE (Small size cones or bars are used on KILN-SITTER)
While holding the claw down over the trigger, carefully place the cone or bar,
selected for your firing, flat on the metal cone supports with the inside edge of the
number circle even with the outside edge of the cone supports. See Figure 8. The
cone or bar should be against the metal step with the center of the cone or bar
parallel with the end of the tube.
Consistent placement of the cone or bar in this manner will lead to consistent firing
control.
The cone or bar now holds the claw engages so that the weight is supported and your
hands are free.
8. CHECK THE POSITION OF THE CONE OR BAR
As a last step before closing the kiln, always check to see that the cone or bar is in
its proper position and free of obstructions. AN IMPROPERLY PLACED CONE OR
BAR COULD CAUSE AN OVERFIRING AND DAMAGE YOUR KILN AND WARE.
9. CLOSE THE KILN All switches are off at this point.
10.REMOVE THE TOP PEEP HOLE PLUG
Venting of the kiln for the entire firing period will add years of life to your KILN-
SITTERtube assembly. (On large kilns also remove the bottom peephole plug.)
11.INSERT A FINGER INTO THE HOLE IN THE WEIGHT AND PUSH FIRMLY IN ON
THE PLUNGER UNTIL IT LOCKS.
12.WEIGHT CLEARANCE
The area outside the kiln should be clear of obstructions so the free fall of the
weight is not impeded.
13.FIRE THE KILN BY USING THE REGULAR KILN SWITCHES, AS INSTRUCTED
BY THE KILN MANUFACTURER.
WITNESS CONES
DO NOT LEAVE THE KILN UNATTENDED BEYOND THE ESTIMATED FIRING
TIME. An uncontrollable accident, such as greenware falling against the end of the
KILN-SITTERtube may cause an over-firing, which could damage your kiln.
Should this occur, the operator should be in attendance to shut of the kiln manually.
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