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

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Controller Operation

Proportional Band

99. Wholenumberportionoftheset-pointresistanceashes

fortwosecondsandthenthefractionportionofthecurrent

set-pointresistancesettingisdisplayed

.222 Fractionportionofthecurrentset-pointresistancesetting

The set-point resistance is 99.222.

6.5 Secondary Menu

Functions which are used less often are accessed within the secondary menu. The

secondary menu is accessed by pressing “SET” and “EXIT” simultaneously and then

releasing. The rst function in the secondary menu is the heater power display. (See

Figure .)

6.6 Heater Power

The temperature controller controls the temperature of the well by pulsing the heater

on and off. The total power being applied to the heater is determined by the duty

cycle or the ratio of heater on time to the pulse cycle time. By knowing the amount of

heating, the user can tell if the calibrator is heating up to the set-point, cooling down,

or controlling at a constant temperature. Monitoring the percent heater power, allows

the user to know the stability of the well temperature. With good control stability the

percent heating power should not uctuate more than ±1% within one minute.

The heater power display is accessed in the secondary menu. Press “SET” and “EXIT”

simultaneously and release. The heater power is displayed as a percentage of full

power.

100.0 C Welltemperature

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

To exit out of the secondary menu press “EXIT”. To continue on to the proportional

band setting function press “SET”.

6.7 Proportional Band

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

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