Sentry Industries Sentry 2.0 Starting a Firing in a Hot Kiln, Glass Fusing Firing Schedule

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If you are not using a kiln vent, leave peephole plugs out and vent the lid. Set the alarm to 1000°F. When the alarm sounds, close the lid from venting position.

Set the alarm again, this time to 1850° F. When it sounds, check the witness cone through the peephole. When the cone bends to six o’clock, write down the temperature. (Use that temperature in segment 4 on your next firing of the same type of ware.) Then press 9, ENTER(Skip Segment).

This will advance you to segment 5, a slow cooling seg- ment. Do not open the lid until the kiln has cooled to room temperature.

Glass Fusing Firing Schedule

 

Rate

Temp.

 

Segment

°F/°C

°F/°C

Hold

1

250/138

750/398

00.00

2

900/500

1425/773

00.30

3

9999/9999

1050/565

00.00

4

150/83

750/398

00.00

Stained glass, 1 8", 2 layers, full fuse. The fusing tempera- ture will vary depending on the brand of glass, the batch, and even upon the color. Vent the lid. Set the alarm to 500°F. When the alarm sounds, close the lid from venting position and insert peephole plugs.

Set the alarm again, this time to 1350°F. When it sounds, check the glass through the peephole. When the glass fuses to your satisfaction, write down the temperature and hold time for future firings, and press 9, ENTER(Skip Segment).

This will advance you to segment 3, a flash cooling seg- ment. Lift the kiln lid slightly or open the door ajar until the temperature drops to 1050° F. Then close the door/lid. The kiln will cool slowly through the annealing range, then turn off.

Note: A cooling rate of 9999 (FULL) shuts off the warning alarm that sometimes sounds during rapid cooling. For more details about alarms, see page 20.

Glass Slumping Firing Schedule

 

Rate

Temp.

 

Segment

°F/°C

°F/°C

Hold

1

250/138

750/398

00.00

2

900/500

1250/676

00.30

3

9999/9999

1050/565

00.00

4

150/83

750/398

00.00

Stained glass, 1 8", 2 fused layers, 12" circular pieces, slumped into a bowl. Set the alarm to 500° F. When the alarm sounds, close the lid from venting position and insert peep- hole plugs.

Set the alarm again, this time to 1150° F. When it sounds, check the glass through the peephole. When the glass slumps into the bowl, write down the temperature and hold time for future firings, and press 9, ENTER(Skip Segment).

This will advance you to segment 3, a flash cooling seg- ment. Lift the kiln lid slightly or open the door ajar until the temperature drops to 1050° F. Then close the door/lid. The kiln will cool slowly through the annealing range. Then it will turn off and cool to room temperature.

Note: A cooling rate of 9999 (FULL) shuts off the warning alarm that sometimes sounds during rapid cooling. For more details about alarms, see page 20.

Starting a Firing in a Hot Kiln

Sometimes a firing begins in a hot kiln after a power fail- ure, or other interruption. In this case, the Sentry will begin firing from the first segment that matches the current tem- perature. See Power Failures, page 23.

When the Kiln Shuts Off Too Soon

Ceramic Firings

If the kiln fires to completion before the pyrometric wit- ness cone bends, you can turn the kiln back on and keep fir- ing. Simply program a hotter temperature. Then from IdLE , press START. The kiln will begin firing, taking up where it left off.

Note: By looking at the witness cones through a peephole, you will know if the kiln shuts off too soon.

If the kiln shuts off within 100°F/55°C of maturity, and the temperature drops 50°F/28°C or more after the kiln shuts off, do not depend on the witness cones. Once they cool 50°F/28°C after they have been heated to within 100°F/55°C of maturity, they will not bend properly. This is because they form a hard shell.

Wrong Thermocouple Type

If a Type-K thermocouple is installed on your kiln, but your controller is set for Type-S, the kiln will continually underfire by a wide margin. See page 19 to check thermo- couple type.

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Contents Multiple Zone Options Standard OptionsIntroduction Contents Basic Pointers SafetyRoom Temperature and Humidity Thunder Storms and Power SurgesRepeat Firings How to Get IdLE to DisplayDisplay Lights Firing Completion MessageKeys Stop/Back Key Cone Numbers Skip SegmentEnter/Start Options KeyFiring Schedules How to Position Cones on the ShelfCone-Fire Pyrometric Witness ConesCone-Fire Features Speed SPdPre-Heat Prht Cone-Fire Programming Hold HOLdMirror Test Wrong Thermocouple Type When the Kiln Shuts Off Too SoonSlow Cooling Cool For Kilns with AOP OutletDefinition of a Segment Ramp-HoldUser Programs User Ramp-Hold ProgrammingSegments for Controlled Cooling Firing a Stored User ProgramRate AOP FanCeramic Firings Glass Fusing Firing ScheduleStarting a Firing in a Hot Kiln Glass Slumping Firing ScheduleMultiple Zone Kilns Cone Offset Ofst OptionsCone-Fire Options Cone-Fire Speed SpdGeneral Options Fan FANThermocouple Offset Tcos Thermocouple Type TC Selecting F or C CHGAOP Outlet AOP Temperature Deviation TedeMaximum Temperature Sfty Electronics Temperature ElecMultiple Zone Options Error Messages Non-Interrupting Error MessagesTerminating Error Messages TCR / Thermocouple Leads Reversed How the Sentry Handles Power FailuresPlog Error Codes TCdE / Uneven Multiple Zone TemperaturesAppendix a Display Messages Safety Power FailureDiagnostic Test Failure ResetLow Fire Cones F SegmentCone Rate 1 Temp Rate 2 Temp Low Fire Cones C Appendix B Preset Standard Cone-Fire Schedules CUpgrading the DTC 100, 600, 800 & 1000 to the Sentry Appendix C Upgrading InstructionsPage 05 1/2 Cone Self-Supporting Cones Pre-Fire Number Color022 010Appendix E Sentry Ramp-Hold Shorthand InstructionsKiln is now firing. Use Program Review by pressing Appendix F Sentry Cone-Fire Shorthand ProgrammingKiln is now firing to the cone you selected

Sentry 2.0 specifications

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