Operating instructions
CleverLevel switch, LFFS
Ex ia IIC T5, ATEX II 1G - Installation
A Level Switch LFFS-1xx.x is Ex ia IIC T5, ATEX II 1G ap-
proved for application in hazardous areas in accordance with
the current EU directives. The product must be installed in
accordance with prevailing guidelines for zone 0 with a barrier
ATEX Gas ia
LFFS-1xx.x
with
PNP output
Safe area
+ 22...120 VDC
or
- 90...253 VAC
Note:
For PNP output the barrier module
PFOFSI3-B25100-ALG-LS
is required for functional purposes.
PF
O
F
S
I3
-B2
51
00
-AL
G
-L
S
NPN out
LFFS-1xx.x
with
NPN output
Note:
For NPN output only!
A standard barrier may be used
St
an
da
rd
b
arri
er
Two-channel
ZENER barrier
www.baumer.com
Operating instructions: 11109132 09 EN Page 8 / 20
Note:
There is an electrical connection between intrinsic safe
circuit and housing due to the measurement principle
ATEX Dust tD
A Level Switch LFFS-2xx.x is Ex tD A20 IP67 T100°C, ATEX II 1D
approved for application in hazardous areas in accordance with the
current EU-directives. The product must be installed in accordance
with prevailing guidelines for zone 20 without a barrier.
Ex-data
Supply range
VDC
12,5...30
Load
I
<0.1 A
Temperature class T1...T5 Pls. see table top page 7
12,5...30
1
2
5
ATEX Gas nA
A Level Switch LFFS-3xx.x is Ex nA II T5, ATEX II 3G approved for
application in hazardous areas in accordance with the current EU
directives. The product must be installed in accordance with prevailing
guidelines for zone 2 without a barrier.
Ex-data
Supply range
VDC
12,5...30
Load
I
<0.1 A
Temperature class T1...T5 Pls. see table top page 7
12,5...30
1
2
5
Ex-data
Supply range
24...30 VDC
Temperature class T1...T5 Pls. see above table
Internal inductivity L
i
<10 µH
Internal capacity C
i
<3 nF
Barrier data
U
<30 VDC
I
<0.1 A
P
<0.75 W
Ex-Configuring
The FlexProgrammer 9701 configuring unit must not be connected to the CleverLevel Switch LFFS within the hazardous area.
Configuring procedure:
a) Disconnect mains from the 4...20 mA loop circuit.
b) Disconnect the Level Switch from the circuitry within the hazardous area.
c) Uninstall and bring the Level Switch to the safe area.
d) Connect the FlexProgrammer 9701 and perform the configuring session.
e) Re-install the Level Switch in the hazardous area.
