Endress+Hauser levelflex M FMP 40, Руководство по эксплуатации

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Levelflex M FMP 40 with Foundation Fieldbus 10 Technical data
Hauser 89
10 Technical data
10.1 Technical data at a glance
Application
Application The Levelflex M performs continuous level measurement of powdery to
granular bulk solids and liquids e.g. plastic granulate. Probes are available
with threaded process connections from ¾" and flanges from DN40 / 1½":
• Rope probes, above all for measurement in bulk solids, measuring range
up to 35 m/1378"
• Rod probes, above all for liquids
• Coax probes, for liquids
Function and system design
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 see page 12)
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).
Equipment architecture see page 101 ff.
Input
Measured variable The measured variable is the distance between the reference point and the
product surface.
Subject to the input zero point empty distance the level is calculated.
Alternatively, the level can be converted by means of linearisation into other
variables (volume, mass).
Measuring range see Technical Information TI 358F
Output
Output signal • Foundation Fieldbus
Signal on alarm Error information can be accessed via the following interfaces:
• Local display:
– Error symbol (see page 35)
– Plain text display
• Digital interface
Auxiliary energy
Electrical connection • Housing F 12 with additionally sealed terminal compartment for standard
or EEx ia
Cable entry see page 29
Supply voltage see page 30 ff.
Power consumption min. 60 mW, max. 900 mW