Endress+Hauser Levelflex FMP50 Bedienungsanleitung Seite 26

XA00518F-E
26
Non-sparking
Ex nA
Basic specification, Position 1, 2 (Approval) = BG, IG
In potentially explosive atmospheres:
– Do not disconnect electrical connections when energized.
– Do not connect the service tool (e.g. FXA291).
Basic specification, Position 5 (Housing) = A
The housing is not approved for Ex nA explosion protection.
Potential equalization
• Integrate the device into the local potential equalization.
• Grounding the screen, see the following figure.
1
 6
A Version 1: Use small capacitors (e.g. 1 nF, 1 500 V dielectric strength, ceramic).
Total capacitance connected to the screen may not exceed 10 nF.
B Version 2
1 Terminating resistor
2 Distributor/T box
3 Screen insulated
4 Supply unit/Segment coupler
5 Potential equalization (secured in high degree)
6 Field device
Overvoltage protection
• If an overvoltage protection against atmospheric over voltages is required: no other circuits may
leave the housing during normal operation without additional measures.
• For installations which require overvoltage protection to comply with national regulations or
standards, install the device using overvoltage protection (e.g. HAW56x from Endress+Hauser).
• Observe the safety instructions of the overvoltage protection.
Optional specification, ID Nx (Accessory Mounted) = NA (Overvoltage protection Type OVP20)
The intrinsically safe input power circuit of the device is isolated from ground. If the device is only
equipped with one input, the dielectric strength of the input is at least 290 V
equipped with more than one input, the dielectric strength of each individual input to ground is at
least 290 V , and the dielectric strength of the inputs vis-à-vis one another is also at least
rms
290 V .
rms
Levelflex FMP50/51/52/53/54/55/56/57
2 2
6
3
A
4
C
B
4
6
5
. If the device is
rms
Endress+Hauser
A0022352