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

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