Electrical connections
12
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
O
(V
OC
) = 30 V, I
O
(I
SC
) = 0.3 A, P
O
= 700 mW.
— 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
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
connections to the safety barrier are not exceeded, also taking the cable
into account. The safety-related input parameters of the transmitter are: C
i
= 5 nF, L
i
= 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 P3U entity parameters also taking the cable into account.
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 suitable for R
Cable
(Loop) Note
MTL MTL 5541 Zone 0, Div. 1 ≤ 350 Ω Suitable only for 2-wire
Pepperl & Fuchs KFD2–CR–Ex1.30 200 Zone 0, Div. 1 ≤ 400 Ω Suitable only for 2-wire
Manufacturer Type suitable for R
Cable
(Loop) Note
Endress +
Hauser
RN 221 N–B1 (ATEX) Zone 0 ≤ 380 Ω Suitable only for 2-wire
RN 221 N–C1 (FM) Div. 1 ≤ 380 Ω Suitable only for 2-wire
RN 221 N–D1 (CSA) Div. 1 ≤ 380 Ω Suitable only for 2-wire
RN 221 N–E1 (TIIS) ≤ 380 Ω Suitable only for 2-wire
MTL MTL 5541 Zone 0, Div. 1 ≤ 400 Ω Suitable for 2-wire
and 3-wire
Pepperl & Fuchs KFD2–STC4–Ex1 Zone 0, Div. 1 ≤ 300 Ω Suitable for 2-wire
and 3-wire
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