Cutout - Fluke 7341 User Manual

7341 Calibration Bath
User's Guide
9.10
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Cutout

As a protection against software or hardware fault, shorted heater triac, or user
error, the bath is equipped with an adjustable heater cutout device that shuts off
power to the heater if the bath temperature exceeds a set value. This protects
the heater and bath materials from excessive temperatures and, most impor-
tantly, protects the bath fluids from being heated beyond the safe operating
temperature preventing hazardous vaporization, breakdown, or ignition of the
liquid. The cutout temperature is programmable by the operator from the front
panel of the controller. It must always be set below the upper temperature limit
of the fluid and no more than 10 degrees above the upper temperature limit of
the bath.
If the cutout is activated because of excessive bath temperature, power to the
heater is shut off and the bath cools. The display flashes "Cut-out" and the
message will be sent over the communication ports. The bath cools until it
reaches a few degrees below the cutout set-point temperature. At this point the
action of the cutout is determined by the setting of the cutout mode parameter.
The cutout has two selectable modes — automatic reset or manual reset. If the
mode is set to automatic, the cutout automatically resets itself when the bath
temperature falls below the reset temperature allowing the bath to heat up
again. If the mode is set to manual, the heater remains disabled until the user
manually resets the cutout.
The cutout 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 cutout set-point.
S E
+
Access heater power in secondary menu
12 Pct Heater power in percent
S
Access proportional band
Proportional band setting
Pb=0.101C
S
Access cutout set-point
Cutout set-point
CO= 110C
To change the cutout set-point press "UP" or "DOWN".
D
Decrement display
New cutout set-point
CO= 75C