Dräger Polytron 7000 User Manual

Electrical connections
18
Connections between several transmitters and a control
unit with HART multidrop connections
 Each transmitter must first be put into service separately. Use the menu
item "Polling Address" to assign a different polling address in the range "1"
to "15" to each transmitter which is to be connected to the multidrop cable
(see page 70). It is best to assign sequential polling addresses, starting with
"1".
Installing the transmitters in areas subject to explosion hazards of zone
0 or zone 1
 Depending on the supply unit, up to 7 transmitters can be connected to a 2-
wire or 3-wire cable.
The second cable gland is used for the cable to the next transmitter.
 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.
— The safety barrier must be capable of transmitting the communications sig-
nals in both directions between the explosion-hazard area and the non-ex-
plosion-hazard area. Several manufacturers offer special SMART
transmitter supply units for this purpose.
SMART transmitter supply units
(with HART-communication between Ex/Non-Ex area)
The following safety barriers are provided as examples only and have not
been certified for use in combination with the P3U. Selected barriers must be
acceptable to the authority having jurisdiction and comply with the assigned
P3U entity parameters also taking the cable into account.
— If a HART hand-held terminal is used, the permissible values may be lower.
Observe the safety-related parameters of the hand-held terminal.
Manufacturer Type suitable for
R
Cable
(Total)
for up to
5 transmitters
for up to
6 transmitters
for up to
7 transmitters
Endress +
Hauser
RN 221 N–B1
(ATEX)
Zone 0
≤ 120 Ω ≤ 50 Ω –––
RN 221 N–C1 (FM)
Div. 1
RN 221 N–D1 (CSA)
RN 221 N–E1 (TIIS)
MTL MTL 5042 Zone 0, Div.
1
≤ 33 Ω ≤ 27 Ω ≤ 20 Ω
Pepperl & Fuchs KFD2–STC4–Ex1 Zone 0, Div.
1
≤ 90 Ω ≤ 10 Ω –––

Dräger Polytron 7000 Specifications

General

Brand	Dräger
Model	Polytron 7000
Category	Adapter
Language	English