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23
Controller Operation
Proportional Band
99. Wholenumberportionoftheset-pointresistanceashes
fortwosecondsandthenthefractionportionofthecurrent
set-pointresistancesettingisdisplayed
.222 Fractionportionofthecurrentset-pointresistancesetting
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 Welltemperature
S+E
Accessheaterpowerinsecondarymenu
SEC FlashesSECforsecondarymenuandthendisplaysthe
heaterpower
12.0P Heaterpowerinpercent
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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