Sentry Industries Sentry 2.0 - Manual (Page 6)

Chapter 2
The Keys
Correcting Entries
If you enter the wrong temperature, cone, time, etc., while
programming, enter 0000. Then enter the correct numbers
before pressing ENTER. See also the 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 be in 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. The operator assumes full 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
values for that program. The program in active memory is—
■ 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 F 20 . Slow speed displays as S 20 .
(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 can enter only one alarm temperature at a time. How-
ever, after the alarm beeps, you can set the alarm 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 an alarm temperature automati-
cally erases the previous alarm temperature.
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