The followingchart contains sevenexamples ofCone Off
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sets.Programanytemperatureinthe01-50°F/1-28°Crange,
hotter or cooler, using these examples as a guide:
Cone Offset Examples, °F
0001 Kiln will fire 1°F Hotter
0030 Kiln will fire 30°F Hotter
0049 Kiln will fire 49°F Hotter
0000 or 9000 No Adjustment
9005 Kiln will fire 5°F Cooler
9040 Kiln will fire 40°F Cooler
9049 Kiln will fire 49°F Cooler
*Cone Offset works in °C the same as in °F. In the
above examples, replace °F temperatures with
equivalent °C.
Once you enter a Cone Offset number, Cone-Fire will re
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mainadjustedtothatnumberfor thatconeuntil youchangeit
again. Keep a written record of Cone Offset adjustments.
Interpreting Cone Bending
Thelargeconeonthekilnshelfshouldbevisiblethrougha
peephole. Avoid exposure to cool air by keeping the cone at
least 3” from the peephole. Program the DTC 1000 for the
cone on the shelf and fire. After cooling, check the cone:
The cone bent to 6 o’clock: In
this case, the controller is matched
to your kiln. The self-supporting
coneillustratedhasfiredtomaturity
whenthe tipiseven withthebase as
shown.
The cone did not bend far
enough: Use a 00_ _ Cone Offset
number for a hotter firing. (About
0025 for the cone at right.)
Theconebenttoo far: Usea90__
Cone Offset for a cooler firing.
(9045 for the over-fired cone at
right. This varies depending on
cone number.)
Do not be overly concerned with achieving an exact 6
o’clock bend. The differencebetween a3 o’clockand a 6
o’clock bend is only a few degrees.
When Cone Temperature
Is Off More Than 50°F
Suppose you are firing to cone 017 (1360°F), but the next
hottercone,016(1422°F)bendsto6o’clock.Thekilnisfiring
62°Ftoohot(1422-1360=62).62°Fisbeyondthe50°Fmaxi
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mum adjustment of Cone Offset.
When thermocouple inaccuracy exceeds 50°F, replace the
thermocouple. If you must fire the kiln before installing the
new thermocouple, combine Thermocouple Offset and Hold
time. Reminder: as a rule of thumb,
One Hour Of Hold = One Cone Of Heat Work
Ramp-Hold
Ramp-Hold fires in segments. Each segment has an end temperature, a degrees per hour
rate to reach that temperature, and a hold time. Do NOT use Ramp-Hold until you have read
“Ramp-Hold Basics” and “Ramp-Hold Programming.” To take full advantage of other fea
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tures, read “Advanced Ramp-Hold,” page 11.
Ramp-Hold Basics
User Programs
When you enter Ramp-Hold mode, the first prompt to ap
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pear is USEr , meaning, “Select a User Program.” A User
Program is a firing schedule stored in memory. It includes
1) number of segments needed
2)rate(howfasttemperaturechangesindegreesperhour)
for each segment
3) target temperature for each segment
4) hold, if any, for each segment
5) alarm temperature, if any.
The controller can retain six user programs in memory
even when power to the kiln is turned off.
IfusingRamp-Holdforthefirsttime, press1when USEr
appears.Yourfirstfiringwillbestoredas UserProgram#1.
Eachtimeyoustoreanother program,select thenextavail
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ablenumber, suchas2, atthe USEr prompt. Writedown the
firing profiles of your User Programs.
Touseastoredprogram,selecttheprogramnumberatthe
USEr prompt. Press ENTER. If there are no changes to the
program, press STOP. CPL will appear, then IdLE . The
controlleris readytofireyour selectedprogram.To beginfir
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ing, press ENTER twice. (See “Program Review,” page 5, be
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fore firing.)
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