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A segment, which is a target temperature and a rate of
heating to reach that temperature, can also have a hold. Hold
means maintaining the target temperature for a length of
time. (Diagram C, page 3.)
Firing to a temperature at a single rate would need only
one segment. Reasons to add more segments:
■
To have more than one heating rate
■
To add a hold somewhere below the shut-off tempera-
ture (see diagram D below)
■
To change the temperature direction. Example: to con-
trol the cooling rate.
Diagram D, below, shows a 3 segment firing. Two seg-
ments were used on the way up in temperature. Another
segment was added for controlled cooling.
Diagram D: a 3 segment firing.
Hold (Displays as HOLd)
Hold gives the temperature time to become more even
throughout the kiln. Hold can be used in either heating up or
cooling down segments.
When Hold is set to 99.59 hours, the Sentry will remain at
that temperature indefinitely, until you press STOP. To
program a 99.59 hour hold, press the Down arrow once from
00.00 during programming. (See next page.)
Note: During firing, Hold will display as tempera-
ture and the hours and minutes left in Hold.
Delay (Displays as DELA)
The Delay feature sets a timer that starts the kiln later.
You might find Delay useful in arranging a long firing to shut
off at a time that is convenient for you.
DELA
appears last when programming a firing. To delay
the firing, enter the delay time in hours and minutes. (To
skip Delay, leave it set at 00.00.) Then press START. After a
delay has started, the controller will show time remaining
before firing begins. Delay zeroes out after each firing.
Note: Press START/STOP during Delay to end the
delay and go back to
99 hours and 59 minutes.
4
. The maximum delay is
IdLE
Note: For safety, do not leave the kiln alone during a
delay or a firing. We cannot guarantee your kiln
against overfiring even though the controller is au-
tomatic. The operator assumes full responsibility
for shutting the kiln off at the proper time.
Power Failures
After a power failure, the controller will continue firing
provided that:
■
The kiln temperature is above 212°F/100°C when the
power comes back on.
■
The temperature dropped no more than 180°F/100°C
while the power was off.
Power Failure Messages
PF 1
The power failed during firing, and temperature
dropped more than 180°F/100°C.
PF 2
The power failed during firing, and kiln tempera-
ture was below 212°F/100°C when the power came back on.
How to Repeat a Firing
1 From
, press the Down Arrow key. The speed,
IdLE
temperature, and hold from the last firing will dis-
play one after the other.
2
will appear. Press START.
Strt
To delay the firing, enter a delay time (e.g. 1 hour 10
minutes = 01.10). No delay: leave the delay set to
00.00. The kiln will begin firing after a 20 second
pause or after you press START.
Controlled Cooling in Ramp-Hold
Use Ramp-Hold mode to program a slow cooling. The
Single Segment mode cannot control cooling rate.
For controlled cooling, program a segment to a lower tar-
get temperature than that of the preceding segment. The
controller, of course, cannot speed cooling beyond the kiln's
natural cooling rate.
During fast cooling, do not open the lid or door all the way.
Do not force-cool the kiln with a fan.
Starting a Firing in a Hot Kiln
Some firings begin in a hot kiln after a power failure, or
other interruption. In a single segment firing, the controller
will begin firing from the current temperature to the target
temperature. In Ramp-Hold, the firing will begin from the
first segment that encompasses the current temperature.
Note: If the kiln is already hotter than the
programmed target temperature when you begin
firing,
CPLt
will flash.
Skipping a Segment in Ramp-Hold
During Ramp-Hold firing, you can skip a segment as fol-
lows:
1 The kiln is firing. Press the Up Arrow key.
2
will appear. Press the Up Arrow key again.
SStP
The firing will skip to the next segment.
will appear.
DELA
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