Signal Transmission To Control Unit; Cable Specifications; Power Supply And Relays - Dräger Polytron 8000 Serie Instructions For Use

en Technical data
Sensor
Type 334 (IDS 01x1)
Type 340 (IDS 01x2)
®
Polytron 8720 IR with PIR
7200 infrared gas sensor
(IDS 01x5)
1) For adjustable full scale deflection, see 15.3.

17.2 Signal transmission to control unit

The measuring range and performance characteristics
depend on the installed sensor (see the Instructions for Use
and/or data sheet for the installed sensors).
Frequency of measurement calculation: 1 x per second
(update of display, analog interface and relays).
Analog signal
Normal operation
Drift below zero
Measuring range
exceeded
Instrument fault
Fault on analog
interface
Maintenance signal
Impedance of the signal loop
Operating Impedance
mode range of the
signal loop
Operation 0 to 230 Ω
without
Rising linearly
®
HART com-
with the supply
munication
voltage from:
0 to 230 Ω at 10
V to
0 to 500 Ω at 16
V
0 to 500 Ω
Measuring range
1)
0 to 10,000 ppm
1)
0 to 100 %LEL,
1)
0 to 5 Vol%,
For CH4 (Methane) 0 to 100
1)
Vol%
1)
0 to 10,000 ppm
1)
0 to 100 %LEL
1)
0 to 5 Vol%
1)
0 to 100 Vol%
4 ... 20 mA
3,8 ... 4 mA
20 ... 20,5 mA
≤ 1.2 mA
> 21 mA
3.4 mA steady signal or 1 Hz mod-
ulation between 3 and 5 mA
(selectable)
Supply voltage range
at 10 V DC
10 to 18 V DC
18 to 30 V DC
Operating Impedance
mode range of the
signal loop
Operation 230 to 270 Ω
®
with HART
Rising linearly
communica-
with the supply
tion
voltage from:
230 to 270 Ω at
11 V to
230 to 500 Ω at
16 V
230 to 500 Ω
230 to 500 Ω
®
HART Mul-
tidrop opera-
tion
For further information regarding the fieldbus interface
installation consult the corresponding Technical Hanbook.

17.3 Cable specifications

For non-conduit installations, use shielded cables.
®
Analog and HART connection with control unit and
power supply
Power supply and
signals
Relays
Digital connection with control unit
Instruments with fieldbus interfaces and remote sensors
must be installed with shielded cables.
Modbus RTU
®
PROFIBUS PA
TM
Foundation Field-
bus
Power supply

17.4 Power supply and relays

1)
Relay rating
2)
SPDT
230 V
30 V , resistive
load
1) For safety-related applications (SIL 2), the maximum contact rating is
®
reduced (see Polytron 8xx0 Safety Manual).
2) Single pole, double throw, (changeover electrical contacts)
Supply voltage range
at 13 V DC
11 to 16 V DC
18 to 30 V DC
10 to 30 V DC
3-core shielded cable
24 - 12 AWG / 0.2 - 2.5 mm²
20 - 12 AWG / 0.5 - 2.5 mm²
4-core, ≥ AWG 26
2-core, Cable type A
Wave impedance R :135 - 165 Ω
w
Capacitance / unit length C':<
30 pF/m
Loop resistance R':110 Ω/km
Core diameter d:0.64 mm
Core cross section q:> 0.34 mm²
Shield coverage:> 90 %
24 - 12 AWG / 0.2 - 2.5 mm²
0.1 A - 5 A
0.1 A (minimum) - 5 A
®
Dräger Polytron 8000 Series