Dräger Polytron 3000, Instructions Manual

Page: 9 / 68

9
Installing the transmitter
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
o
(V
oc
)
≤ 30 V, I
o
(Isc) ≤ 0.3 A, P
o
≤ 700 mW.
— 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
i
= 0 nF, Li = 50 µH.
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.
— Connect shielding to earth point and/or 0 V (Ex i).
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
O
(V
OC
) ≤ 30 V, I
O
(I
SC
) ≤ 0.3 A, P
O
≤ 700 mW.
— 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
i
= 0 nF, Li = 50 µH.
Manufacturer Type suitable for Line (Loop)
MTL MTL 5041 Zone 0, Div. 1 ≤ 190
Ω
Pepperl & Fuchs KFD2–STC4–Ex1 Zone 0, Div. 1 ≤ 140
Ω
KFD2–STC1–Ex1 Zone 0, Div. 1 ≤ 140
Ω
CAUTION
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!
00433020_1_en.eps
Non-explosion-hazard area Explosion-hazard area, zone 0, 1 or Div. 1
Safety barrier
Control unit
Ex i
PA
Earth point
4 ... 20 mA
0 V
+
–
+
4 to 20 mA
+24 V