17
6 Controller Operation
6
Controller Operation
This chapter discusses in detail how to operate the instrument temperature controller 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 controller proportional band, and program the calibration parameters, operat-
ing parameters, and serial interface configuration. Operation of the functions and parameters
are shown in the flowchart in Figure on page . 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
LED
type text indicates the display reading. Explanation of the but-
ton or display reading are to the right of each button or display value.
6.1
Well Temperature
The digital LED display on the front panel allows direct viewing of the actual well tempera-
ture. This temperature value is what is normally shown on the display. 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.
6.2
Temperature Set-point
The temperature set-point can be set to any value within the range and with resolution 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 selecting one of the eight set-points in memory and then ad-
justing the set-point value.
6.2.1 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.
100.0 C
Well temperature in degrees Celsius
S
Access set-point memory
1. 100.
Set-point memory 1, 100°C currently used.
To change to another set-point memory press “UP” or “DOWN”.
4. 300.
New set-point memory 4, 300°C
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