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9
Controller Operation
This chapter 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-
tional band, set the cutout set-point, and program the probe calibration parame-
ters, operating parameters, serial and IEEE-488 interface configuration, and
controller calibration parameters. Operation is summarized in Figure 6.
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,
25.00 C
The temperature display function may be accessed from any other function by
pressing the "EXIT" button.
9.2
Reset Cutout
If the over-temperature cutout has been triggered then the temperature display
will alternately flash,
cutout
The message will continue to flash until the temperature is reduced and the cut-
out is reset.
The cutout has two modes — automatic reset and manual reset. The mode de-
termines how the cutout is reset which allows the bath to heat up again. When
in automatic mode, the cutout will reset itself as soon as the temperature is low-
ered below the cutout set-point. With manual reset mode the cutout must be re-
set by the operator after the temperature falls below the set-point.
When the cutout is active and the cutout mode is set to manual ("reset") then
the display will flash "cutout" until the user resets the cutout. To access the re-
set cutout function press the "SET" button.
The display will indicate the reset function.
rESEt ?
Bath temperature in degrees Celsius
Indicates cut-out condition
Access cutout reset function
Cutout reset function
Controller Operation
29
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