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9 Controller Operation
This section discusses in detail how to operate the bath temperature controller
using the front control panel. Using the front panel key-switches and LED dis
-
play the user may monitor the bath temperature, set the temperature set-point in
degrees C or F, monitor the heater output power, adjust the controller propor
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tional band, and program the calibration parameters, operating parameters, and
serial interface configuration. Operation of the functions and parameters are
shown in the flowchart in Figure 4 on page 36. 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.
9.1 Bath Temperature
The digital LED display on the front panel allows direct viewing of the actual
bath 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,
10.00C
Bath temperature in degrees Celsius
The temperature display function may be accessed from any other function by
pressing the “EXIT” button.
9.2 Temperature Set-point
The temperature set-point can be set to any value within the range and resolu
-
tion as given in the specifications. Be careful not to exceed the safe temperature
limits of any devices inserted into the bath.
Setting the temperature involves two steps: (1) select the set-point memory and
(2) adjust the set-point value.
To protect the refrigeration system from excessive pressures, it will not operate
above 50°C.
9.2.1 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.
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9 Controller Operation