Sentry Sentry 2.0 Betriebsanleitung PDF herunterladen (Seite 10)

Chapter 3

Cone-Fire

Cone-Fire mode is based on pyrometric

cones. It is not designed for heat treating,

glass fusing and enameling. For these

firings, see “Ramp-Hold,” page 14. Use

Ramp-Hold to fire ceramic pieces that

require a custom firing schedule, such as

some types of stoneware sculpture or

crystalline glaze.

Before using Cone-Fire, read all of this

chapter. Have your controller in front of

you so that you can try out the keys as you

read. For more information on pyromet

ric cones and venting, please see your

kiln’s instruction manual.

Pyrometric Witness Cones

The Sentry shuts off au-

tomatically without cones.

Nevertheless, every ceramic

firing should include at least

one witness cone (also

called the shelf cone). The

witness cone is the most ac-

curate measurement of heat

work in a ceramic firing.

If you fire the same size

load and type of ware regu

larly, the witness cones let

you compare one firing to

the next and alert you when something is wrong. For exam

ple, if the witness cone bends less and less with each consec

utive firing, this may indicate thermocouple

temperature drift.

Note: If the bending of the witness cone does

not match the Cone-Fire shut-off, you may

want to adjust Cone Offset or Thermocouple

Offset. See pages 20 - 21. If the witness cones

bendinconsistently from one firingto another,

see “Sentry Troubleshooter,” a separate

publication.

How to Position Cones on the Shelf

Position the witness cones so that you can

see them through a peephole during firing. If

the kiln takes longer than usual to fire, you may wonder if

somethinghas gone wrong andthe kilnis over-firing.Butby

seeing the cones, you will

know how the firing is ac

tually progressing.

If you follow these

guidelines, you should be

able to see the cones even

at cone 10:

Place the cones 8” -

12” away from a

peephole. Position

ing them closer

makes them difficult

to see.

Have enough space around the cones to keep them

from touching a piece of ware when they bend.

Position cones so that when viewed from the peep

hole, they are silhouetted by an element on the op

posite kiln wall. (Keep cones at least 2” from an el

ement.)

The element that silhouettes the cones should be

level with the lower part of the cone. If the element

is in line with the upper part of the cone, you won’t

be able to see the cone when it bends.

If you use the three cone system, always have the

higher temperature cone on the same side in every

firing. Otherwise you can lose track of which cone

is which.

Wear kiln firing safety glasses when viewing the

cones through the peephole.

See your dealer if in doubt about which cone number to

use with each clay and glaze.

Firing Schedules

Cone-Fire uses three firing schedules:

Low fire cones 022 - 011

Medium fire cones 010 - 01

High fire cones 1 - 10

The firing schedules programmed into

Cone-Fire are listed in Appendix B, pages 32 -

33. Should you ever want to customize a

Cone-Fire program, transfer the firing sched

ule to Ramp-Hold (page 14). Then make the

desired changes to the firing schedule.

During a cone firing, press (Present Sta

tus) to see which stage, or segment, of the fir

ing the kiln has reached. The number dis

played will be a segment number from one of

these firing schedules.

Note: Pre-Heat shows in Present Status as .

It is not given a separate segment number.

10 Cone-Fire / Ramp-Hold

Silhouette the lower part of the cone

against an element. Keep the cone 8”

- 12” away from the peephole.

Use self-supporting witness

cones on the shelf. They stand

upright without cone holders.

Position witness

cones inside the

kiln so that you

can see them

through a peep-

hole. Always use

firing safety

glasses.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 39 40

Kommentare zu diesen Handbüchern

Keine Kommentare

Sentry Sentry 2.0 Betriebsanleitung Seite 10

Kommentare zu diesen Handbüchern

Verwandte Produkte und Handbücher für Nein Sentry Sentry 2.0