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7 Controller Operation
This section discusses in detail how to operate the calibrator temperature con
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troller using the front control panel. By using the front panel key-switches and
LED display, the user may monitor the well temperature, adjust the set-point
temperature in degrees C or F, monitor the heater output power, adjust the con
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troller proportional band, operating parameters, serial interface configuration,
and controller calibration parameters. Operation of the functions and parame
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ters are shown in the flowchart in Figure 4 on page 20. This chart may be cop
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ied for reference.
In the following discussion a button with the word SET, UP, DOWN, or EXIT
inside indicates the panel button while the dotted box indicates the display
reading. Explanation of the button or display reading are to the right of each
button or display value.
7.1 Well Temperature
The digital LED display on the front panel allows direct viewing of the actual
well temperature. This temperature value is what is normally shown on the dis-
play. The units, C or F, of the temperature value are displayed at the right. For
example,
100.0 C Well temperature in degrees Celsius
The temperature display function may be accessed from any other function by
pressing the “EXIT” button.
7.2 Temperature Set-point
The temperature set-point can be set to any value within the range and resolu
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tion as given in the specifications. Be careful not to exceed the safe upper tem
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perature limit of any device inserted into the well.
Setting the temperature involves selecting one of the eight (8) set-points in
memory and then adjusting the set-point value.
7.2.1 Programmable Set-points
The controller stores eight (8) set-point temperatures in memory. The set-points
can be quickly recalled to conveniently set the calibrator to a previously pro
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grammed temperature set-point.
To set the temperature, first select the set-point memory. This function is ac
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cessed from the temperature display function by pressing “SET”. The number
of the set-point memory currently being used is shown at the left on the display
followed by the current set-point value.
19
7 Controller Operation
Well Temperature
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