Dräger Polytron 8100, Instructions For Use Manual, Page: 10 / 254

10 Dräger Polytron 8100
Installation
3.3 Impedance of signal loop
3.4 Mechanical installation
 Use the drilling template for mounting on a flat surface.
 The mounting surface should be even.
 Dräger recommends using M6, 1/4” bolts with hex socket
caps.
 The instrument must be accessible for maintenance (e.g.
calibration).
 The future use of accessories and maintenance equipment
must be kept in mind.

The access of the gas or vapor to the sensor must not be
obstructed.
3.5 Electrical installation without Docking
Station
Refer to the appropriate figure on the fold-out page and
proceed with the desired point.
3.5.1 Electrical connection for 4-20 mA/HART interface
Refer to figure A on the fold-out page.
1. Loosen set-screw and unscrew lid from instrument.
2. Lift the handle and pull-out the PCB unit with the main
electronics.
3. Turn PCB unit over and pull off the 5-pin connector.
4. Connect the three wires for power and signal to the
appropriate terminal as indicated in the following wiring
table and figure F or G.
5. Fasten terminal screws with the correct torque according to
the table tightening torque and wire size for field wiring
terminal, see Section 10.10 on Page 44.
6. If operated as a stand alone instrument, wire pin 3 to pin4.
7. Plug connector back into socket and tighten screws.
8. The cable shielding should only be connected at the
controller
9. Place PCB unit back into the enclosure.
10. Screw the lid back on, until it is seated (see Section 10.9
on Page 44), and tighten set-screw.
3.5.2 Electrical connection for fieldbus interface
Refer to figure A on the fold-out page.
1. Loosen set-screw and un-screw lid from instrument.
2. Lift the handle and pull-out the PCB unit with the main
electronics.
3. Turn PCB unit over and pull off the 2-pin and 4-pin
connector.
4. Connect the two wires for power and the four wires for
signal to the appropriate terminals as indicated in the
following wiring table and figure H or I.
Operating mode
Impedance range of the
signal loop Supply
voltage range
Operation
without HART
communication
0 to 230
Ω
at 10 V DC
Rising linearly with the
supply voltage from:
0 to 230
Ω
at 10 V to
0 to 500
Ω
at 16 V
10 to 18 V DC
0 to 500
Ω
18 to 30 V DC
Operation with
HART
communication
(HART mode)
230 to 270
Ω
at 13 V DC
Rising linearly with the
supply voltage from:
230 to 270
Ω
at 11 V to
230 to 500
Ω
at 16 V
11 to 16 V DC
230 to 500
Ω
18 to 30 V DC
HART Multidrop
operation
230 to 500
Ω
10 to 30 V DC
WARNING
Only for conduit installations: To reduce the risk of
Ignition of Hazardous Atmospheres, the conduit must
be sealed within 18" of the enclosure.
!
CAUTION
Ensure wiring for relays and connections for sensor
are made before applying power.
Figure Connection diagram for
G Operation as a current source
F Operation as a current sink
I Profibus PA und Foundation Fieldbus H1
H Modbus RTU
5-pin connector (voltage supply and current interface
Pin 1 2 3 4 5
Mark PWR+ PWR- PWR- 4-20 mA PE
Function V+ V- V- 4 to 20 mA signal
(Operation as
source or sink) PE
!