Dräger PEX 3000 Manual Del Usuario página 32

Operation
minimum sup-
2
0.5 mm
ply voltage at
(36 Ohm/km) (24 Ohm/km) (18 Ohm/km)
controller side
18 V 416 m
20 V 555 m
22 V 694 m
24 V 833 m
26 V 972 m
28 V 1110 m
– With a 3-core screened cable, shield braiding with cover ≥80 %, outer
diameter min. 7 mm, max. 12 mm. Connect shielding to the earth clamp of
the controller, keeping this as short as possible.
– Place the cable shielding around the plastic cone as shown in the figure and
insert it into the metal cable gland. By tightening the cable gland, the
shielding is in electrical contact with the conductive inner lining of the
transmitter housing. This measure ensures the required RF-immunity
according to EN 50 270.
≈ 55 mm
WARNING
The cable gland is approved for fixed-location installation only. It is suitable for
line diameters of 7 to 12 mm.
– Remove the transmitter's housing cover
– Connection between the transmitter and controller as shown in the figure.
Core cross-section
2 2
0.75 mm 1.0 mm 1.5 mm
(12 Ohm/k
m)
625 m 833 m 1249 m
833 m 1110 m 1666 m
1041 m 1388 m 2082 m
1249 m 1666 m 2498 m
1457 m 1943 m 2915 m
1666 m 2221 m 3331 m
≈ 12 mm
Type XTR 0090 and XTR 0091:
– Connection between sensing head SE Ex and the transmitter as shown.
2
– The controller and power supply unit may also be combined in a single
device.
Cable screen
PEX 3000
contacted within
Type XTR 0000,
the cable gland
XTR 0001,
XTR 0010
and XTR 0011
Cable screen
contacted within
the cable gland
PEX 3000, all types
Connection to the controller:
Connect terminal +24V to
+24 volts
PEX 3000
Type XTR 0090,
XTR 0091
max. cable length
50 m
100 m
150 m
Sensing head
Polytron SE Ex PR ... DQ
1 2 3
1 2 3
PEX 3000, types XTR 0090 and
XTR 0091
Connection to the sensing head
Connect terminal br/br to termi-
nal 1
Dräger PEX 3000
Power supply
+24 Volts
24 V 20 %,
0 Volt
0.15 A
4 to 20 mA
0 mA
Controller Unit
core cross-section
2
0.5 mm
2
1.0 mm
2
1.5 mm