Fluke 7341 - Cutout

7341
Users Guide
9-12
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 importantly, 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
Pb=0.101C Proportional band setting
S
Access cutout set-
p
oint
CO=110C Cutout set-point
To change the cutout set-point press “UP” or “DOWN”.
D
Decrement display
CO=75C New cutout set-point
To accept the new cutout set-point press “SET”.
S
Access cutout set-
p
oint
The next function is the configuration menu. Press “EXIT” to resume displaying the bath
temperature.