Screening/Potential Matching; Degree Of Protection - Endress+Hauser Levelflex M Brief Operating Instructions

Wiring
Supply voltage
The following values are the voltages across the terminals directly at the instrument:
• standard: 9V...32V
• Lift-off voltage: 9V
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 DIN EN 60079-14, standard for testprocedures
DIN 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. HAW262Z).
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.
3.8

Degree of protection

• with closed housing tested according to:
– all housing: IP68, NEMA6P (24 h at 1.83 m under water surface); IP66, NEMA4X
– F23 housing: IP69K in combination with cable entries M20, G½ and NPT½
• with open housing: IP20, NEMA1 (also ingress protection of the display)
16
15 mA
≤ 15 mA
0 mA
compliant
no
Levelflex M FMP43 with FOUNDATION Fieldbus
Endress+Hauser