Levelflex M FMP40 - Process Centre Of Excellence.

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Commissioning Levelflex M FMP40 with HART/4...20 mA ! Note! 6.8.2 Envelope curve with the ToF Tool After the basic setup, an evaluation of the measurement using the envelope curve is recommended (→ ä 72). L00-FMP4xxxx-20-00-00-en-007 For the optimization of the measurement the installation of the Levelflex in another place can be executed when enterference echoes. An evaluation of the measurement with the aid of the envelope curve Typical curve shape: The following examples display typical curve shapes for a rope or rod probe in an empty tank. For all probe types, a negative probe end signal is shown. For rope probes, the end weight causes an additional preliminary positive echo (see rope probe diagram). [mV] [mV] 400.00 400.00 300.00 300.00 200.00 200.00 100.00 100.00 0.00 0.00 -100.00 -100.00 (1.00 m, -143.00 mV) -200.00 -200.00 -300.00 -300.00 Launch pulse Probe end signal -400.00 -400.00 Launch pulse (1.08 m, -115.00 mV) -500.00 F E LN -500.00 F E LN 0.00 0.20 0.40 0.60 0.80 1.00 [m] 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 [m] Rod probe Rope probe Probe end signal L00-FMP40xxx-05-00-00-en-024 Level echoes are detected as positive signals in the envelope curve. Interference echoes can be both positive (e.g. reflections from internals) and negative (e.g. nozzles). The envelope curve, the map and the differential curve are used for the evaluation.Level echoes are searched for in the differential curve. 72 Endress + Hauser
Levelflex M FMP40 with HART/4...20 mA Commissioning Evaluation of the measurement: • The map must correspond to the course of the envelope curve (for rod probes up to approx. 5 cm and for rope probes up to approx. 25 cm before the end of the probe) when the tank is empty. • Amplitudes in the differential curve should be at a level of 0 mV when the tank is empty and lie within the span that is specified by the probe-specific blocking distances. In order to not detect any interference echoes, there must be no signals that exceed the echo threshold when the tank is empty. • For partially-filled tanks, the map may only differ from the envelope curve at the position of the level echo. The level signal is then detected unequivocally as a positive signal in the differential curve. For detecting the level echo, the amplitude must lie above the echo threshold. [mV] 400.00 300.00 200.00 100.00 0.00 -100.00 -200.00 -300.00 -400.00 -500.00 0.00 Launch pulse F 0.20 0.40 Negative probe end signal 0.60 [mV] 400.00 300.00 200.00 100.00 0.00 -100.00 -200.00 -300.00 -400.00 -500.00 0.00 6.8.3 User-specific applications (operation) 0.80 Envelope curve L00-FMP40xxx-05-00-00-en-025 For details of setting the parameters of user-specific applications, see separate documentation BA245F/00/en - description of the instrument functions of the Levelflex M. Endress + Hauser 73 E F (1.00 m, -143.00 mV) 0.20 LN 1.00 [m] 0.40 0.60 [mV] 400.00 300.00 200.00 100.00 0.00 -100.00 -200.00 -300.00 -400.00 -500.00 0.00 0.80 F 0.20 E (0.98 m, 0.00 mV) Differential curve = Envelope curve Mapping LN 1.00 0.40 [m] 0.60 Mapping 0.80 E (0.99 m, -137.94 mV) LN 1.00 [m]
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Operating Instructions Levelflex M
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Levelflex M FMP40 with HART/4...20
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