Screening/Potential Matching - Endress+Hauser Levelflex M FMP40 Brief Operating Instructions

Levelflex M FMP40 FOUNDATION Fieldbus
Current consumption
The following values are the voltages across the terminals directly at the device:
Type
standard
Supply voltage
Lift-off voltage
1) There may be additional restrictions for devices with an explosion protection certificate. Refer to the notes in the
appropriate Safety Instructions (XA).
Current consumption
Nominal current
Starting current
Error current
FISCO/FNICO conformal
Polarity sensitive
Overvoltage protection
If the measuring device is used for the level measurement in flammable liquids which requires
the use of an overvoltage protection according to EN/IEC 60079-14 or EN/IEC 60060-1
(10 kA, Puls 8/20 μs) it has to be ensured that
• the measuring device with integrated overvoltage protection with gas discharge tubes within
the T12-enclosure is used, refer to product overview in the Operating instructions on CD-ROM
or
• this protection is achieved by the use of other appropriate measures (external protection
devices e.g. HAW562Z).
3.7

Screening/potential matching

• You achieve optimum screening against disturbances if the screening is connected on both
sides (in the cabinet and on the device). If you have to reckon with potential equalisation
currents in the plant, only earth screening on one side, preferably at the transmitter.
• When using in hazardous areas, you must observe the applicable regulations and the separate
Ex documentation.
Endress+Hauser
Terminal voltage
9 V to 32 V
1)
9 V to 32 V
9 V
15 mA
≤ 15 mA
0 mA
Compliant
No
Wiring
21