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Pb= 2.01C
Proportional band setting
To change the proportional band press “UP” or “DOWN”.
Pb=3.50C
New proportional band setting
To accept the new setting and access the cut-out set-point press “SET”.
Pressing “EXIT” will exit the secondary menu ignoring any changes just made
to the proportional band value.
S
Accept the new proportional band setting
8.10 Cut-out
As a protection against software or hardware fault or user error, the calibrator is
equipped with an adjustable cut-out device that will shut 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 then power to
the heater will be shut off and the instrument will cool. The well will cool 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 pa-
rameter. The cut-out has two modes — automatic reset or manual reset. If the
mode is set to automatic, then the cut-out will automatically reset itself when
the temperature falls below the reset temperature allowing the well to heat up
again. If the mode is set to manual, then the heater will remain 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= 2.01C
Proportional band setting
S
Access cut-out set-point
36 Hart Scientific
8 Controller Operation