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Chapter 2
The Keys
Correcting Entries
Ifyou enterthe wrongtemperature, cone,time,etc., while
programming, enter 0000. Then enter the correct numbers
beforepressing ENTER.See alsothe Stop/Back Key,page 7.
1 / Cone Fire
Cone-Fire is a method of firing ceramics
to a pyrometric cone. See Chapter 3, page 8,
for details. To find out if your Sentry in
-
cludes Cone-Fire:
1 From IdLE display,press 1.If CONE appears,you
have Cone-Fire mode. If the 1 key does not re
-
spond, you have Ramp-Hold mode only.
2 Press STOP to bring the controller back to IdLE .
2 / Add Time
This key adds five minutes to a Hold. It is
designed for ceramists who watch witness
cones through the peephole, and for glass
artists who inspect the glass near the end of firing.
1 During a firing, press Add Time. HOLd , and time
in hold, will appear.
2 Press Add Time again. The time shown will in-
crease by 5 minutes. In a few seconds, temperature
display will return.
Note: Add Time will add 5 minutes to Hold in ei-
ther Cone-Fire or Ramp-Hold, even if no hold had
been programmed. After hold time displays, 5 min
-
utes are added with each press of the key.
3 / Delay
This delays the start of the firing by the
amount of time entered. Use it to fit a firing
into your schedule or to take advantage of
lower electric rates at night. Delay zeroes out after each fir
-
ing. Therefore, it must be programmed for each firing.
1 A Cone-Fire or Ramp-Hold program must bein ac
-
tive memory, ready to fire. (See pages 10 and 13.)
2 From IdLE press 3. Enter delay time (i.e., 5 ½
hours = 05.30). Press ENTER.
3 To begin Delay, press ENTER once from IdLE .A
Delay count-down timer will appear.
Note: Press START during delay to end the delay
and begin the firing. The maximum delay is 99
hours and 59 minutes.
CAUTION: 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
automatic. Theoperator assumesfull responsibility
for shutting the kiln off at the proper time.
4 / Ramp Hold
Ramp-Hold fires the kiln to the tempera
-
ture you specify, whereas Cone-Fire fires to
a pyrometric cone. Press 4 from IdLE to
program a firing or to select a stored program. See
“Ramp-Hold,” page 12.
5 / Present Status
Press 5 during a firing to display the cur
-
rent segment that is firing. The messages
that can appear in Present Status:
■
RA 1 Ramp (see page 12), and segment number.
■
Hd 1 Hold (see page 12), and segment number.
■
PRHT Cone-Fire Pre-Heat (see page 9).
■
COOL Cone-Fire Slow Cooling (see page 11).
Uses for Present Status:
■
You are firing a program that contains several heating
and cooling segments. Without Present Status, it would
be easy to lose track of which segment is firing.
■
In Cone-Fire, you may think the kiln has fired too long
when it is actually only in a slow cooling.
6 / Program Review
When you press ENTER to begin firing,
the controller will fire the program that is in
active memory. Program Review shows the
valuesfor thatprogram. Theprogramin activememoryis—
■
The program that was fired last, or
■
The program that was selected since the last firing.
Start Program Review from IdLE , or while firing, by
pressing 6.
Note: In Program Review, Cone-Fire Fast speed
displays as F20. Slow speed displays as S20.
(These speeds are 20% faster and slower than the
standard speed.)
7 / Alarm
The alarm sounds when the kiln reaches
the alarm temperature you enter. Use the
alarm to alert you to—
■
Lower the lid from venting position (ceramics).
■
Check the witness cone near shut-off time (ceramics).
■
Check the fusing or slumping of glass.
■
Remove the knife blade from the furnace at the end of
heat treating.
You canenter onlyone alarmtemperature ata time.How
-
ever, after the alarm beeps, you can set thealarm for another
temperature, as many times as you want, during the firing.
You can enter a higher or lower temperature than the cur
-
rent temperature. Entering analarm temperature automati
-
cally erases the previous alarm temperature.
6