Supply Voltage; Recommended Connection - Endress+Hauser Prosonic M FMU40 Brief Operating Instructions

Prosonic M FOUNDATION Fieldbus
3.6

Supply voltage

The following values are the voltages across the terminals directly at the instrument:
• minimum terminal voltage: 9 V
• maximum terminal voltage: 32 V
The current consumption is approx. 15 mA for the range of voltages given above.
3.7

Recommended connection

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1: external ground terminal of the transmitter
For maximum EMC protection please observe the following points:
• As the metal housing of the Prosonic M is isolated from the tank by the plastic sensor, a
low-impedance connection between the housing and tank/bracket/flange should be installed
in order to ensure electromagnetic compatibility (EMC).
For optimum EMC the connection should be as short as possible. Ideally, a ground strap
should be used.
• The continuity of the cable screening between tapping points must be ensured.
• If potential equalisation is present between the individual grounding points, ground the
screening at each cable end or connect it to the device housing (as short as possible).
• If there are large differences in potential between grounding points, the grounding should run
via a capacitor that is suitable for high frequency use (e.g. ceramic 10 nF/250 V&).
"
Caution!
Applications, which are subject to the explosion prevention, permit only under special
conditions the repeated grounding of the protective screen , see to EN 60 079-14.
Endress+Hauser
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Wiring
L00-FMU4xxxx-17-00-00-yy-014
17