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█ © Brüel & Kjaer Vibro ● S1079330.002 / V04
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EN
9.5.1 4-20 mA Fault Conditions
In the event of a sensor fault, the 4 to 20 mA output will drop to bottom scale (4 mA). This value is
configurable in the MPS Setup software. A 2 mA clamp option is also available for faulted channels.
An output between 20 mA and 24 mA indicates an over-range condition.
9.5.2 4-20 mA Output Wiring
The maximum cable length is a function of the supply voltage and the total loop resistance as shown
in Figure 9-14.
Figure 9-14) Analog Output Maximum Loop Resistance
The total loop resistance includes the sensing load and the total wire resistance. For wire runs longer
than 1,500 m (5,000 ft.) 24 AWG is the minimum recommended wire size. Use 20 AWG wire for runs
up to 3,000 m (10,000 ft.). Above 3,000 m (10,000 ft.) the cable capacitance may limit frequency
response. Consult with Brüel & Kjær Vibro if you need analog output wiring runs longer than 3,000 m
(10,000 ft.)
Shielded wire is recommended to reduce electrical noise. Terminate shielding at the receiving
device.
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