Endress+Hauser Levelflex M FMP40 Operating Instructions Manual page 105

Levelflex M FMP40 with HART/4...20 mA
Endress + Hauser
Input
The reflected pulses are transmitted from the probe to the electronics. There, a microprocessor
analyses the signals and identifies the level echo, which was generated by the reflection of the high-
frequency pulses at the product surface. This clear signal finding benefits from the more than 30
years of experience with pulse time-of-flight procedures that have been integrated into the
development of the PulseMaster
The distance D to the product surface is proportional to the time of flight t of the impulse:
D = c · t/2,
with c being the speed of light.
Based on the known empty distance E, the level L is calculated:
L = E – D
Reference point for "E" see above diagram, Details → ä 54.
The Levelflex possesses functions for the interference echo suppression that can be activated by the
user. They guarantee that interference echoes from e.g. internals and struts are not interpreted as
level echoes.
11.3.2 Equipment architecture
Stand-alone
• Power supply directly from power line (4-wire) or from transmitter power supply unit (2-wire).
• Operation by on-site display or remote operation via HART protocol.
PLC
transmitter power
supply unit
RMA422
or RN221N
(communication resistor
included)
ENDRESS + HAUSER
RMA 422
FXA191/195
or 375
If the HART communication resistor is not installed in the supply device and HART protocol
communication is to be carried out, it is necessary to insert a ≥ 250 Ω communication resistor into
the 2-wire line.
®
Software.
FieldCare
Commubox
Power supply
FXA191/195
(for 4-wire)
operating and
display module
VU331
asdas fa dsdmdm dsdmdm df das. df das. asdas fa
asas la. asas la.
DELTABAR: * * * * * * * * DELTABAR: * * * * * * * *
ONLINE ONLINE
1 QUICK SETUP 1 QUICK SETUP
2 OPERATING MENU 2 OPERATING MENU
3 PV 3 PV 352 mbar 352 mbar
4 SV 4 SV 0 °C 0 °C
HELP HELP SAVE SAVE
9 9 6 6
Page Page
Up Up
Bksp Bksp Delete Delete
Page Page
On On
# % & # % & A B C A B C D E F D E F
1 1 2 2 3 3
Copy Copy Paste Paste Hot Key Hot Key
G H I G H I J K L J K L M N O M N O
4 4 5 5 6 6
Insert Insert + Hot Key + Hot Key
P Q R S P Q R S T U V T U V W X Y Z W X Y Z
7 7 8 8 9 9
HART handheld
, ( ) ' , ( ) ' _ < > _ < > + * / + * /
. . 0 0 - -
375
375 375
FIELD COMMUNICATOR FIELD COMMUNICATOR
Appendix
FieldCare
service adapter
• FXA291/ToF Adapter FXA291
ENDRESS + HAUSER
%
– + E
L00-FMxxxxxx-14-00-06-en-008
105