www.baumer.com
Operators instructions
CombiPress, type PFMx
ATEX Gas ia and for ATEX Dust ia
For ATEX ia Gas zone 0 and ATEX ia Dust zone 20 a zener barrier must separate the hazardous and safe area and must be in-
stalled in accordance with prevailing guidelines for zone 0 / zone 20.
ATEX ia Gas / Dust data:
Approval: Gas Zone 0/1
II 1 G, Ex ia IIC T5 Ga
Dust Zone 20/21
II 1 D, Ex ia IIIC T100°C Da
Voltage drop
U
Disp
4,5 or 6,5 VDC
Temperature class T1…T5 Zone 0 and 20
-20°C…60°C
Zone 1/2 and 21/22 -40°C…65°C
Internal inductivity
L
i
<10 µH
Internal capacity
C
i
<15 nF
Barrier data
U
i
<30 VDC
I
i
<0,1 A
P
i
<0,75 W
Suitable barrier
e.g.: Fuchs, Z728
The display is supplied via the UnitCom from the transmitter. However to make the transmitter/display intrinsic safe a zener barrier
must be inserted before the PFMx/DFON. As the CombiView, type DFON is attached to a Baumer PFMx transmitter using the Unit-
Com ribbon cable, it is considered to be an integrated part of the instrument.
If the relays are enabled, each relay must be protected by a zener barrier. Use a barrier for each relay or a barrier with multiple
channels. However the two relays must have each a barrier.
Barrier data U
<30 VDC
I
<75 mA
P
<0,75 W
Suitable barrier
e.g.: Fuchs, Z779
Electrical connection
PFMx without relay output
PFMx with relay output
1 +
2 -
Zener
barrier
15…30 VDC
1 +
2 -
3
4
5
6
15…30 VDC
Zener
barrier
Zener
barrier
Zener
barrier
0…30 VDC
75 mA
0…30 VDC
75 mA
Relay 2
Relay 1
Page 9 / 32
English
Operating Instructions: 11120948 03
