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Operation
● Put the PEX 1000 on the top-hat rail and apply slight pressure to it until it
engages.
Make sure that the top-hat rail engages completely and the PEX 1000 is
securely fixed to the top-hat rail.
5.2
Installing electrical connections
CAUTION
Electrical wiring is only to be laid and connected by an expert in compliance with
the pertinent regulations and laws concerning electrical equipment in potentially
explosive atmospheres as well as the approval conditions.
Connection between the transmitter and controller:
–
The maximum cable lengths for input resistances of 250 Ohms can be
found in the following table.
minimum sup-
2
0.5 mm
ply voltage at
(36 Ohm/km) (24 Ohm/km) (18 Ohm/km)
controller side
18 V
200 m
20 V
270 m
22 V
340 m
24 V
410 m
26 V
480 m
28 V
550 m
28
Core cross-section
2
2
0.75 mm
1.0 mm
1.5 mm
(12 Ohm/k
m)
310 m
419 m
620 m
410 m
550 m
830 m
520 m
690 m
1040 m
620 m
830 m
1250 m
730 m
970 m
1469 m
830 m
1110 m
1679 m
Cable length between sensor and PEX 1000:
Sensor Current
0.5 mm
(36 Ohm/km) (24 Ohm/km) (18 Ohm/km)
240 mA
200 m
250 mA
185 m
260 mA
170 m
270 mA
160 m
280 mA
150 m
290 mA
140 m
300 mA
130 m
2
1. Connection between the transmitter and controller as shown in the figure.
2. Connection between sensing head SE Ex and the PEX 1000 as shown.
The power supply may also be an integral part of the controller unit.
Core cross-section
2
2
2
0.75 mm
1.0 mm
300 m
400 m
280 m
370 m
260 m
345 m
240 m
320 m
225 m
300 m
210 m
280 m
195 m
260 m
2
1.5 mm
(12 Ohm/k
m)
500 m
500 m
500 m
500 m
500 m
450 m
400 m
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