1
Select Fast (1), Medium (2), or Slow (3) when pro-
gramming a firing.
2
Alter a speed in the Speed
[SPD]
option.
Every cone has a standard firing schedule, shown on
pages 32 - 33. Select Medium speed (the 2 key) during
Cone-Fire programming, and the cone will fire to the stan-
dard schedule. Select Fast (1), and the standard schedule
will speed up by 20%. Select Slow (3), and the standard
schedule will slow down by 20%.
In the Speed option, you can further adjust the speed of a
standard schedule 10 - 40% slower or faster:
1
First, program a Cone-Fire.
2
After programming a Cone-Fire,
[IDLE]]
will ap-
pear. From
[ IDLE]
, press
OPTIONS
until
[SPD]
appears.
3
Press
ENTER
. Use the
1
or
3
key to scroll through
this selection:
[STD]
Same as Medium in cone programming
[F10]
10% faster than standard
[F20]
Same as Fast in cone programming
[F30]
30% faster than standard
[F40]
40% faster than standard
[S40]
40% slower than standard
[S30]
30% slower than standard
[S20]
Same as Slow in cone programming
[S10]
10% slower than standard
When the speed of choice appears, press
ENTER
.
4
To go back to
[IDLE]
, press
STOP
.
The kiln is now ready to fire with the new speed.
Note:
SPD settings do not affect the final ramp
segment of the cone program.
Pointer:
If you are not sure whether the Cone-Fire
speeds have been altered, check by going to the
SPD option and pressing Enter.
OFST / Cone Offset
Calibrate Cone-Fire to a Witness Cone
Sometimes the pyrometric cones programmed in
Cone-Fire do not match the bending of the witness cones.
Cone Offset will adjust Cone-Fire to bend the cones.
Note:
Thermocouple Offset (see page 22) adjusts
all temperature readings. Cone Offset changes
only the last heating segment of the cone firings. In
the earlier Sentry 2.0 controller, Cone Offset ad-
justed one particular temperature range of cones.
Cone Offset in the Sentry 3.0 adjusts all the cones
instead of only a range of cones.
Follow these guidelines before deciding that you need to
use Cone Offset:
I
The thermocouple must protrude into the firing cham-
ber the correct distance: about ¾” for ¼” wide
thermocouples, ½” - 5/8” for 1/8” wide thermocouples.
I
Keep shelves 1” - 1 ½” away from the thermocouple.
I
Keep witness cones at least 2” away from heating ele-
ments.
I
Place witness cones in several locations in the kiln.
How to Use Cone Offset
Cone Offset changes the shut-off point of the cone by the
degrees of temperature shown in the chart below.
1
First, program a Cone-Fire.
2
From
[IDLE]
, press
OPTIONS
until
[OFST]
ap-
pears.
3
Press
ENTER
. The current Cone Offset adjust-
ment number will appear.
4
Using the
1
and
3
keys, select a new adjustment
number (see chart below). Then press
ENTER
.
[OFST]
will appear. To return to
[IDLE]
, press
STOP
.
Cone Offset Settings
Note: select a cone in Cone-Fire before changing Cone Offset.
°F Setting
°C Setting
Result
0
0
No adjustment
5
3
Kiln will fire hotter
10
6
Kiln will fire hotter
15
8
Kiln will fire hotter
20
11
Kiln will fire hotter
-5
-3
Kiln will fire cooler
-10
-6
Kiln will fire cooler
-15
-8
Kiln will fire cooler
-20
-11
Kiln will fire cooler
A cone offset remains in memory unless you use the Re-
set option (page 26).
Interpreting Cone Bending
Position the witness cones in the kiln according to the in-
structions on page 11.
The cone bent to 6 o’clock: No
calibration in Cone Offset needed.
The self-supporting cone has fired
to maturity when the tip is close to
even with the cone base as shown.
The cone did not bend far
enough: Use a positive Cone Off-
set number for a hotter firing, such
as 10 (°F).
20
Cone-Fire / Ramp-Hold
Do not leave your kiln unattended during operation.
