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7 Controller Operation
This chapter discusses in detail how to operate the dry-well temperature con
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troller using the front control panel. Using the front panel key-switches and
LED display the user may monitor the well temperature, set the temperature
set-point in degrees C or F, monitor the heater output power, adjust the control
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ler proportional band, and program the calibration parameters, operating pa
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rameters, and serial interface configuration. Operation of the functions and
parameters are shown in the flowchart in Figure 4 on page 22. This chart may
be copied for reference.
In the following discussion a button with the word SET, UP, EXIT or DOWN
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 with res
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olution as given in the specifications. Be careful not to exceed the safe upper
temperature limit of any device inserted into the well.
Setting the temperature involves two steps: (1) select the set-point memory and
(2) adjust the set-point value.
7.2.1 Programmable Set-points
The controller stores 8 set-point temperatures in memory. The set-points can be
quickly recalled to conveniently set the calibrator to a previously programmed
temperature set-point.
To set the temperature one must first select the set-point memory. This function
is accessed 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.
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7 Controller Operation
Well Temperature