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-
tional band, set the cut-out set-point, and program the probe calibration param-
eters, operating parameters, serial and IEEE-488 interface configuration, and
controller calibration parameters. Operation is summarized in
Figure 8.
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
Bath temperature in degrees Celsius
The temperature display function may be accessed from any other function by
pressing the “EXIT” button.
9.2
Reset Cut-out
If the over-temperature cut-out has been triggered, the temperature display will
alternately flash,
cut-out
Indicates cut-out condition
The message continues to flash until the temperature is reduced and the cut-out
is reset.
The cut-out has two modes — automatic reset and manual reset. The mode de-
termines how the cut-out is reset which allows the bath to heat up again. When
in automatic mode, the cut-out resets itself as soon as the temperature is low-
ered below the cut-out set-point. With manual reset mode the cut-out must be
reset by the operator after the temperature falls below the set-point.
When the cut-out is active and the cut-out mode is set to manual (
“reset”
),
then the display flashes
“cut-out”
until the user resets the cut-out. To access
the reset cut-out function press the “SET” button.
S
Access cut-out reset function
The display indicates the reset function.
37
9 Controller Operation
Bath Temperature