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Installing the transmitter in areas subject to explosion hazards of zone 0
or zone 1
Install a safety barrier with the appropriate explosion protection approval
(category 1, 2 or Div. 1) between the transmitter and the control unit.
— Only safety barriers with the following characteristics may be used: U
≤30 V, I
(Isc) ≤0.3 A, P
o
— Take care that the maximum permissible capacitance and inductance of connec-
tions to the safety barrier are not exceeded, also taking the cable into account.
The safety-related input parameters of the transmitter are: C
Transmitter supply units
(without HART-communication between Ex/Non-Ex area)
The following safety barriers are provided as examples only. Selected barriers must
be acceptable to the authority having jurisdiction and comply with the assigned P3S
entity parameters also taking the cable into account.
Manufacturer
Type
MTL
MTL 5041
Pepperl & Fuchs
KFD2–STC4–Ex1
KFD2–STC1–Ex1
— Connect shielding to earth point and/or 0 V (Ex i).
Explosion-hazard area, zone 0, 1 or Div. 1
4 to 20 mA
+24 V
Installing the transmitters in explosion-hazard areas of zone 2, or in
areas not subject to explosion hazards
— Use only supply units or a safety barrier classified as device category 3.
— Only supply units or safety barriers with the following characteristics may be
used: U
(V
) ≤ 30 V, I
O
OC
— Take care that the maximum permissible capacitance and inductance of connec-
tions to the supply unit are not exceeded, also taking the cable into account.
The safety-related input parameters of the transmitter are:
C
= 0 nF, Li = 50 µH.
i
The category 1 marking has to be cut out from the rating-plate label. Once the unit
has been used after installation in the above manner, it may never be installed in
explosion-hazard areas of zone 0 or zone 1 (device category 1 or 2).
Explosion hazard!
≤700 mW.
o
suitable for
Zone 0, Div. 1
Zone 0, Div. 1
Zone 0, Div. 1
(I
) ≤ 0.3 A, P
≤ 700 mW.
O
SC
O
CAUTION
(V
)
o
oc
= 0 nF, Li = 50 µH.
i
Line (Loop)
≤190 Ω
≤140 Ω
≤140 Ω
Non-explosion-hazard area
Safety barrier
Ex i
PA
Earth point
Installing the transmitter
+
4 ... 20 mA
+
–
0 V
Control unit
9
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