Cerabar M, Deltabar M, Deltapilot M / 4...20 mA HART Wiring
Endress+Hauser 33
4.2 Connecting the measuring unit
4.2.1 Supply voltage
!
Note!
• When using the measuring device in hazardous areas, installation must comply with the
corresponding national standards and regulations and the Safety Instructions or Installation or
Control Drawings.
• All explosion protection data are given in separate documentation which is available upon
request. The Ex documentation is supplied as standard with all devices approved for use in
explosion hazardous areas.
Taking 4 to 20 mA test signal
A 4 to 20 mA test signal may be measured via the test terminals without interrupting the
measurement.
To keep the corresponding measured error below 0.1%, the current measuring device should
exhibit an internal resistance of < 0.7 .
4.2.2 Cable specification
• Endress+Hauser recommends using twisted, shielded two-wire cables.
• Terminals for wire cross-sections 0.5 to 2.5 mm
2
(20 to 14 AWG)
• Cable outer diameter: 5 to 9 mm (0.2 to 0.35 in)
4.2.3 Load
P01-xxxxxxxx-05-xx-xx-xx-003
Fig. 22: Load diagram
Supply voltage 11.5 to 45 V DC (versions with plug-in connector 35 V DC) for other types of protection and for uncertified
device versions
R
Lmax
Maximum load resistance
U Supply voltage
!
Note!
When operating via a handheld terminal or via a PC with an operating program, a minimum
communication resistance of 250 must be taken into account.
Electronic version
4 to 20 mA HART,
for non-hazardous areas
11.5 to 45 V DC
(versions with plug-in connector 35 V DC)
30
20
11.5
U
[V]
40 45
1239
1456
804
369
[]W
R
L
max
U – 11.5 V
R
L
max
0.023 A
£
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