8 Controller Operation
This chapter discusses in detail how to operate the dry-well temperature con-
trollerusing the front control panel. Using the front panel key-switches and
LED display theuser may monitor the welltemperature, set the temperature
set-pointin degrees C or F, monitor the heater output power, adjust the control-
lerp roportionalband, set the cut-out set-point, and program the probe calibra-
tion parameters, operating parameters, serial and IEEE-488 interface
configuration,and controller calibration parameters. Operation of the functions
are summarized in Figure6 on page 24.
In thefollowing discussion a solid box around the word SET, UP,EXIT or
DOWNindicates the p anel button while the dotted box indicates the display
reading. Explanation of the buttonor display reading are to the right of each
button or display value.
8.1 Well Temperature
The digitalLED 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,
20.00 C Well temperature in degrees Celsius
The temperaturedisplay function may be accessed from other functions by
pressing the “EXIT”button.
8.2 Reset Cut-out
If the over-temperaturecut-out has been triggered then the temperature display
will alternately flash,
cut-out Indicates cut-out condition
The message will continue to flash until the temperature is reduced and the
cut-out is reset.
The cut-outhas twomodes — automatic reset and manual reset. (See Section
8.11.2.2) The mode determineshow the cut-out is reset which allows the instru-
ment to heat up again. When in automatic mode, the cut-out will reset itself as
soon as the temperature islowered below the cut-out set-point. With manual re-
set mode thecut-out must be reset by the operator after the temperature falls
belowthe set-point.
9105/9107 23
8Controller Operation