04/03 347 LB 444
9
3.2.4 Shieldings for Installation in a Container with
Pneumatically Operated Lock and Shutter Switch
NOTE: Option not available in the USA.
A shielding with a pneumatic lock and
shutter switch is available as a special
version. The pressurized air moves the
source lever to the OPEN position. If the
pressurized air is turned off, or in case
of failure, the spring installed in the
pneumatic cylinder moves the source
back to CLOSED
Pressurized air
:
min. 1*10
5
Pa (1 kp/cm
2
)
max. 6*10
5
Pa (6 kp/cm
2
)
Air quality
clean, as usual for pressurized
air tools, oil free
Closed
Open
Switch CLOSED
Switch OPEN
Cover cap
Connection for
pressurized air
electr. signal
OPEN/CLOSED
Figure 6: : Pneumatic locking mecha-
nism, not Ex-protected
Shutter switches signal the position of the
sources.
Two versions are available:
a) Version for use in areas not endan-
gered of explosion:
2 Reed contacts max. 250 V, 40
VA
1 x for OPEN, 1 x for CLOSED.
b) Version for use in the areas endan-
gered of explosion:
1 proximity switch for position
CLOSED.
It has to be connected to a fail-safe power
supply.
Figure 7 Shutter switch for ex-protected
area
See the drawings which are part of the
documentation for detailed information on
the construction and function of the shield-
ing type used.
Closed
Open
Switch flag
Cover cap
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