S
Accept the new proportional band setting
6.9
Cut-out
As a protection against software or hardware fault, shorted heater triac, or user
error, the calibrator is equipped with an adjustable heater cut-out device that
shuts off power to the heater if the well temperature exceeds a set value. This
protects the instrument and probes from excessive temperatures. The cut-out
temperature is programmable by the operator from the front panel of the
controller.
If the cut-out is activated because of excessive well temperature, power to the
heater shuts off and the instrument cools. The well cools until it reaches a few
degrees below the cut-out set-point temperature. At this point the action of the
cut-out is determined by the setting of the cut-out mode parameter. The cut-out
has two modes — automatic reset or manual reset. If the mode is set to auto-
matic, the cut-out automatically resets itself when the temperature falls below
the reset temperature allowing the well to heat up again. If the mode is set to
manual, the heater remains disabled until the user manually resets the cut-out.
The cut-out set-point may be accessed within the secondary menu. Press “SET”
and “EXIT” to enter the secondary menu and show the heater power. Then
press “SET” twice to access the cut-out set- point.
S+E
Access heater power in secondary menu
12 Pct
Heater power in percent
S
Access proportional band
PB= 4.01C
Proportional band setting
S
Access cut-out set-point
CO= 610C
Cut-out set-point
To change the cut-out set-point press “UP” or “DOWN”.
CO= 400C
New cut-out set-point
To accept the new cut-out set-point press “SET”.
S
Accept cut-out set-point
The next function is the configuration menu. Press “EXIT” to resume display-
ing the well temperature.
9116A Furnace
User’s Guide
32
