Levelflex M FMP40 - Process Centre Of Excellence.

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Appendix Levelflex M FMP40 with HART/4...20 mA ! Note! 11.2 Description of functions A detailed description of the function groups, functions and parameters is given in the documentation BA245F – "Description of the instrument functions" on the enclosed CD-ROM. 11.3 Function and system design 11.3.1 Measuring principle The Levelflex is a "downward-looking" measuring system that functions according to the ToF method (ToF = Time of Flight). The distance from the reference point (process connection of the measuring device → ä 15) to the product surface is measured. High-frequency pulses are injected to a probe and led along the probe. The pulses are reflected by the product surface, received by the electronic evaluation unit and converted into level information. This method is also known as TDR (Time Domain Reflectometry). probe length LN flange: reference point of measurement L00-FMP4xxxx-15-00-00-en-002 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 highfrequency 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 ® Software. 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 53. 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. 104 Endress + Hauser D L F E 20 mA 100% 4mA 0%
Levelflex M FMP40 with HART/4...20 mA Appendix 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 DXR375 L00-FMxxxxxx-14-00-06-en-008 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. On-site operation: • with display and operating module VU331, • with a Personal Computer, FXA193 (RS232C) or FXA291 and ToF Adapter FXA291 (USB) and the operating software "ToF Tool - FieldTool Package" respectively "FieldCare". The ToF Tool is a graphical operating software for instruments from Endress+Hauser that operate based on the time-of-flight principle (radar, ultrasonic, guided micro-impulse). It assists with commissioning, securing data, signal analysis and documentation of the measuring point. 11.3.3 Patents - ToF Tool - FieldTool Package - FieldCare Commubox FXA191/195 This product may be protected by at least one of the following patents. Further patents are pending. • US 5,661,251 i EP 0 780 664 • US 5,827,985 i EP 0 780 664 • US 5,884,231 i EP 0 780 665 • US 5,973,637 i EP 0 928 974 Endress + Hauser 105 Page 9 Up Bksp Delete Page On # % & A B C D E F 1 2 3 Copy Paste Hot Key G H I J K L M N O 4 5 6 Insert + Hot Key P Q R S T U V W X Y Z 7 8 9 , ( ) ‘ _ < > + * / . 0 - 6 HELP SAVE Page 9 Up Bksp Delete Page On # % & A B C D E F 1 2 3 Copy Paste Hot Key G H I J K L M N O 4 5 6 Insert + Hot Key P Q R S T U V W X Y Z 7 8 9 , ( ) ‘ _ < > + * / . 0 - 6 HELP SAVE 375 375 FIELD FIELD COMMUNICATOR COMMUNICATOR dsdmdm dsdmdm df df das. das. asdas asdas fa fa asas asas la. la. DELTABAR: DELTABAR: * * * * * * * * * * * * * * * * ONLINE ONLINE 1 1 QUICK QUICK SETUP SETUP 2 2 OPERATING OPERATING MENU MENU 3 3 PV PV 352 352 mbar mbar 4 4 SV SV 0 0 °C °C HART handheld DXR375 Power supply (for 4-wire) operating and display module VU331 ENDRESS + HAUSER % – + E - ToF Tool - FieldTool Package service adapter FXA193
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