Sentry Industries Sentry 2.0 operating instructions Ramp-Hold, Definition of a Segment

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Chapter 4

Ramp-Hold

Definition of a Segment

Ramp-Hold fires in segments. Every segment must have a target temperature and a heating rate to reach that temper- ature. Shown in diagram A is a segment with a temperature of 750°.

Diagram A: a single segment.

Rate is figured in degrees per hour. In Diagram A above, the temperature takes two hours to reach 750°. The rate is 750 ÷2 = 375.

Diagram B, below, shows three rates. A rate of 1000° will reach 1000° in 1 hour. A rate of 500° will reach 1000° in 2 hours. A rate of 333° will reach 1000° in 3 hours.

Diagram C: a single segment with hold. The two parts of a segment are the ramp and the hold. Not all segments have a hold, but they all have a ramp.

A segment, which is a target temperature and a rate of heating to reach that temperature, can also have a hold. Hold maintains the target temperature for the length of time you specify. (Diagram C, above.)

A segment has two parts:

■Ramp: where the temperature changes

■Hold: where the temperature remains the same

A segment can have only one ramp and only one hold. Therefore, if you need more than one hold, you will have to add additional segments to the firing. Firing to a tempera- ture at a single rate would need only one segment. Reasons to add more segments:

■To change the heating rate

■To add a hold somewhere below the shut-off tempera- ture

■To change the temperature direction. Example: to con- trol the cooling rate.

Diagram D, below, shows a 3 segment firing. Two seg- ments were used on the way up in temperature. Another segment was added for controlled cooling.

Diagram B: Rate is degrees per hour. This diagram shows 3 rates. Di- vide the target temperature by the number of hours it took to reach that temperature.

Diagram D: a 3 segment firing. Only 2 segments have a hold.

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Contents Standard Options Multiple Zone OptionsIntroduction Contents Safety Room Temperature and HumidityThunder Storms and Power Surges Basic PointersHow to Get IdLE to Display Display LightsFiring Completion Message Repeat FiringsKeys Cone Numbers Skip Segment Enter/StartOptions Key Stop/Back KeyHow to Position Cones on the Shelf Cone-FirePyrometric Witness Cones Firing SchedulesCone-Fire Features Speed SPdPre-Heat Prht Cone-Fire Programming Hold HOLdMirror Test When the Kiln Shuts Off Too Soon Slow Cooling CoolFor Kilns with AOP Outlet Wrong Thermocouple TypeRamp-Hold Definition of a SegmentRamp-Hold Programming User Programs UserFiring a Stored User Program RateAOP Fan Segments for Controlled CoolingGlass Fusing Firing Schedule Starting a Firing in a Hot KilnGlass Slumping Firing Schedule Ceramic FiringsMultiple Zone Kilns Options Cone-Fire OptionsCone-Fire Speed Spd Cone Offset OfstGeneral Options Fan FANThermocouple Offset Tcos Selecting F or C CHG Thermocouple Type TCTemperature Deviation Tede Maximum Temperature SftyElectronics Temperature Elec AOP Outlet AOPMultiple Zone Options Error Messages Non-Interrupting Error MessagesTerminating Error Messages How the Sentry Handles Power Failures Plog Error CodesTCdE / Uneven Multiple Zone Temperatures TCR / Thermocouple Leads ReversedAppendix a Display Messages Power Failure Diagnostic Test FailureReset SafetyLow Fire Cones F SegmentCone Rate 1 Temp Rate 2 Temp Appendix B Preset Standard Cone-Fire Schedules C Low Fire Cones CAppendix C Upgrading Instructions Upgrading the DTC 100, 600, 800 & 1000 to the SentryPage Cone Self-Supporting Cones Pre-Fire Number Color 022010 05 1/2Appendix 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

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