Sentry Industries Sentry 2.0 operating instructions Selecting F or C CHG, Thermocouple Type TC

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Calibrating Thermocouple Offset With a Digital Pyrometer

You can calibrate Thermocouple Offset using a cali- brated digital pyrometer. One way to calibrate your pyrome- ter is to take it to a heat treater or other location that has a cal- ibrated controller you can trust. Take a reading from a furnace with your pyrometer. Either zero it out to match the calibrated controller on the furnace, or write down the tem- perature difference between your pyrometer and the reliable source. Store your pyrometer. Use it only for calibrating con- trollers. Thus, it remains a reliable calibration standard.

Note: The temperature at which you calibrated your digital pyrometer should be the same tempera- ture you use to check the controller’s temperature readout. Example: if you took a reading from a reli- able source at 2000°F, you should check the control- ler reading at around 2000°F.

Mount the thermocouple of the calibrated pyrometer in the firing chamber near the Sentry’s thermocouple. With the Sentry on Hold, compare readings between the Sentry and the calibrated pyrometer. Adjust Thermocouple Offset to compensate for any temperature difference between them.

Setting Thermocouple Offset

You can enter a temperature change up to 45°F/25°C higher or lower than the zero factory setting.

1From IdLE , press OPTIONS repeatedly until TCOS appears.

2Press ENTER. C O , or a Thermocouple Offset, will appear.

3Using the 1 and 2 keys, enter the new offset. (See chart below.) Press ENTER. TCOS will appear. To return to IdLE , press STOP.

Thermocouple Offset Settings

°F Setting

°C Setting

Result

C 0

C 0

No adjustment

H

1-45

H 1-25

Kiln will fire hotter

C

1-45

C 1-25

Kiln will fire cooler

Thermocouple Offset Examples

Setting

Result

H

1

Kiln will fire 1° hotter

H

17

Kiln will fire 17° hotter

C

12

Kiln will fire 12° cooler

Multiple Zone Thermocouple Offset

1From IdLE , press OPTIONS repeatedly until TCOS appears.

2Press ENTER. TC1¯ (top thermocouple) will appear.

3While TC1¯ displays, press OPTIONS. The other thermocouple(s), then TCOS , will appear with each

press of the OPTIONS key.

3 zone kilns:

TC1¯

 

TC2 -

 

 

TC3 _

 

TCOS

2 zone kilns:

TC 1¯

 

TC3 _

 

 

TCOS

 

4When the correct thermocouple appears, press

ENTER.

3Using the 1 and 2 keys, enter the new offset. (See charts at left.) Press ENTER. The thermocouple you adjusted (i.e. TC ¯ ) will appear. Select another ther- mocouple, or return to IdLE by pressing STOP.

Selecting °F or °C (CHG-)

The controller operates in your choice of °F or °C temper- ature. In °C display, a lighted dot appears in the lower right. In °F, it disappears. To switch from °F to °C or vice versa:

1From IdLE , press OPTIONSrepeatedly until CHG- appears.

2 Press ENTER. Use the 1and 2keys to select °F or °C .

3After selecting one of the above, press ENTER. Press STOP to return to IdLE .

°F/°C Temperature Conversion Formula

Below are formulas for converting temperture between °F and °C. Converting a firing rate requires a different for- mula than firing temperature:

Firing Temperature

(i.e. “Fire to 1600°F.” 1600°F = 871°C)

(°C x 1.8) +32 = °F (°F - 32) ÷ 1.8 = °C

Firing Rate and Temperature Change

(i.e. “Fire at 200°F per hour” or “Fire 200°F hotter.” 200°F = 111°C)

°C x 1.8 = °F °F ÷ 1.8 = °C

Thermocouple Type (TC)

Select Type-K, S or R Thermocouple

The Sentry can be used with Type-K, S or R thermocouples. If you specialize in firings above 2200°F/1204°C, you should use the Type-S or R. Type-K is best suited for temperatures below 2200°F/1204°C.

CAUTION: Be careful about changing the thermocouple type! If you select Type-S or R, but your kiln is wired with a Type-K, your kiln will underfire. If you select Type-K and your kiln is wired with a Type-S or R, your kiln will OVERFIRE. After using the Reset (RST) option (page 21), make sure you have the correct thermocouple selected. Reset changes thermocouple selection to Type-S!

1From IdLE , press OPTIONS repeatedly until TC appears.

2 Press ENTER. Use the 1 and 2 keys to select TC K TC R or TC S .

3After selecting one of the above, press ENTER. Press STOP to return to IdLE .

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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 ConesSpeed SPd Cone-Fire FeaturesPre-Heat Prht Hold HOLd Cone-Fire ProgrammingMirror 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 SpdFan FAN General OptionsThermocouple Offset Tcos Thermocouple Type TC Selecting F or C CHGAOP Outlet AOP Temperature Deviation TedeMaximum Temperature Sfty Electronics Temperature ElecMultiple Zone Options Non-Interrupting Error Messages 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 ResetSegment Low Fire Cones FCone 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 010Sentry Ramp-Hold Shorthand Instructions Appendix EKiln is now firing. Use Program Review by pressing Sentry Cone-Fire Shorthand Programming Appendix FKiln is now firing to the cone you selected

Sentry 2.0 specifications

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