FLUKE 9102S/725-KIT User Manual for the Fluke 9102S/725-KIT Lo-Temp Dry-Well and Process Calibrator Kit

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9102S Dry-Well Calibrator

Proportional Band

Proportional Band6.7

In a proportional controller such as this, the heater output power is proportional to the

well temperature over a limited range of temperatures around the set-point. This range

of temperature is called the proportional band. At the bottom of the proportional band,

the heater output is 100%. At the top of the proportional band, the heater output is 0.

Thus, as the temperature rises the heater power is reduced, which consequently tends

to lower the temperature back down. In this way the temperature is maintained at a

constant level.

The temperature stability of the well and response time depend on the width of the

proportional band. If the band is too wide, the well temperature deviates excessively

from the set-point due to varying external conditions. This is because the power output

changes very little with temperature and the controller cannot respond very well to

changing conditions or noise in the system. If the proportional band is too narrow, the

temperature may swing back and forth because the controller overreacts to tempera-

ture variations. For best control stability, the proportional band must be set for the

optimum width.

The proportional band width is set at the factory as printed on the Report of Calibra-

tion. The proportional band width may be altered by the user if desired to optimize the

control characteristics for a particular application.

The proportional band width is easily adjusted from the front panel. The width may

be set to discrete values in degrees C or F depending on the selected units. The pro-

portional band adjustment is accessed within the secondary menu. Press “SET” and

“EXIT” to enter the secondary menu and show the heater power. Then press “SET” to

access the proportional band.

S+E

 Accessheaterpowerinsecondarymenu

SEC FlashesSECforsecondarymenuandthendisplaysthe

heaterpower

12.0P Heater power in percent

 Accessproportionalband

PrOP Flashespropandthendisplaysthesetting

4.1 Proportionalbandsetting

To change the proportional band press u or d.

10.0 Newproportionalbandsetting

To accept the new setting press “SET”. Press “EXIT” to continue without storing the

new value.

 Acceptthenewproportionalbandsetting

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FLUKE 9102S/725-KIT Lo-Temp Dry-Well and Process Calibrator Kit