Page
ST312A
User
Handbook
6
Programming
The firing segment
The ST312A firing segment comprises 2 ramps followed by a soak period.
This single segment can be used for simple firing (biscuit firing for exam-
ple).
The ST312A ramps the kiln temperature at ramp rate 1 until the kiln
reaches temperature t1. It then ramps the kiln temperature to the soak
temperature at ramp rate 2. It then soaks (dwells) at the soak temperature
for the soak time. It then allows the kiln to cool naturally.
The ST312A is capable of both positive (heating) ramps and negative
(cooling) ramps - as used in glassmaking for annealing.
Ramp rate 1 & ramp rate 2 are settable in the range 1°C/hour to 999°C/
hour or
FULL
(full power) or
End
(end of program).
t1 & the soak temperature are settable over the range 0 to 1320°C.
The soak time is settable over the range 00.00 (no soak) to 99 hours 59
mins.
Note: during soaking the ST312A display alternates every 5 seconds
between kiln temperature and soak time remaining.
Pr
ogramming
t1
soak temperature
ra
mp
ra
te
1
ra
m
p
ra
te
2
soak period
ST312A User Handbook
Page 15
Program Pause Facility
While firing press and hold down the
ª
key for about 4 seconds. The
ST312A will pause the executing program. To un-pause the program
press and hold down the
ª
key again for about 4 seconds. The effects of
pausing are as follows:-
If paused during a ramp the kiln temperature will be held (soaked)
indefi-
nitely
at the current kiln temperature. The ramp will continue when un-
pause is selected.
If paused during a soak then the soak time will be
extended indefinitely
.
The remainder of the soak period will be resumed when un-pause is se-
lected.
Segment advance (
©
key held down for about 4 seconds) can also be used
to terminate the pause. This will advance the segment and will immedi-
ately terminate a paused soak and end the firing program.
Changes made to the operation of the ST312A in this way are temporary
and are not stored.
PAUSED
600
°C
°C/hr
hr.min
As a warning during pause a double
beep is sounded every 10 seconds,
the display scrolls
PAUSed
for 5
seconds then shows the kiln tem-
perature for 5 seconds.
Adjusting While
Firing
WARNING - PROGRAM PAUSE
The program pause facility should be used with care. Program execution is
suspended and the kiln will be held at its current temperature indefinitely.
If left too long at high temperatures kiln damage could result.
