Dräger Polytron 7000 Instructions For Use Manual page 12

Electrical connections
Installing transmitter in mines where firedamp may occur
— Install a safety barrier with the appropriate explosion protection approval
(device category M1) between the transmitter and the control unit.
— Only safety barriers or power supply units with the following characteristics
may be used: U (V
O OC
— Make sure the maximum permissible capacitance and inductance connect-
ed to the safety barrier or power supply are not exceeded (taking into ac-
count the line as well). The safety-related input parameters of the
transmitter are as follows: Ci = 0 nF, Li = 50 µH.
Installing the transmitter in areas subject to explosion hazards of zone
0, 1 or Div. 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 ) ≤0.3 A, P
(I
o sc
— Take care that the maximum permissible capacitance and inductance of
connections to the safety barrier are not exceeded, also taking the cable
into account. The safety-related input parameters of the transmitter are: C
= 5 nF, L = 50 µH.
i
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 P3U entity parameters also taking the cable into account.
Manufacturer Type
MTL MTL 5541
Pepperl & Fuchs KFD2–CR–Ex1.30 200
SMART transmitter supply units
(with 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 P3U entity parameters also taking the cable into account.
Manufacturer Type
Endress + RN 221 N–B1 (ATEX)
Hauser
RN 221 N–C1 (FM)
RN 221 N–D1 (CSA)
RN 221 N–E1 (TIIS)
MTL MTL 5541
Pepperl & Fuchs KFD2–STC4–Ex1
12
) = 30 V, I (I ) = 0.3 A, P
O SC
≤700 mW.
o
= 700 mW.
O
(V )
o oc
i
suitable for R
Cable
≤ 350 Ω
Zone 0, Div. 1
≤ 400 Ω
Zone 0, Div. 1
suitable for R
Cable
≤ 380 Ω
Zone 0
≤ 380 Ω
Div. 1
≤ 380 Ω
Div. 1
≤ 380 Ω
≤ 400 Ω
Zone 0, Div. 1
≤
Zone 0, Div. 1 300
(Loop) Note
Suitable only for 2-wire
Suitable only for 2-wire
(Loop) Note
Suitable only for 2-wire
Suitable only for 2-wire
Suitable only for 2-wire
Suitable only for 2-wire
Suitable for 2-wire
and 3-wire
Ω
Suitable for 2-wire
and 3-wire