Endress+Hauser Micropilot S FMR540, Operating Instructions Manual

Page: 12 / 80

I n s t a l l a t i o n
Micropilot S FMR540 4 to 20 mA HART
12 Hauser
3.3.2 Engineering hints
Orientation
• Recommended distance (1) from tank wall to
the center of the nozzle:
minimum as specified in Table on ("Beam
angle",
→
ä
13).
• Not in the centre (3), interference can cause
signal loss.
• Not above the fill stream (4).
• It is recommended to use a weather
protection cover (2) in order to protect the
transmitter from direct sun or rain. Assembly
and disassembly is simply done by means of a
tension clamp ("Accessories",
→
ä
60).
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1
2 3 4
Tank installations
• Avoid any installations (1), like limit
switches, temperature sensors, etc., inside the
signal beam ("Beam angle",
→
ä
13).
• It is essential that HiHi alarm is below the
blocking distance (BD) and the safety distance
(SD).
• Symmetrical installations (2), e.g. vacuum
rings, heating coils, baffles, etc., can also
interfere with the measurement.
Optimization options
• Antenna size: the bigger the antenna, the
smaller the beam angle, the less interference
echoes.
• Mapping: the measurement can be optimized
by means of electronic suppression of
interference echoes.
• Antenna alignment:
"Optimum mounting position",
→
ä
16.
• Stilling well: a stilling well can always be used
to avoid interference. The FMR532 with
planar antenna is recommended for stilling
wells with a diameter DN150 (6") and larger.
• Metallic screens (3) mounted at a slope spread
the radar signals and can, therefore, reduce
interference echoes.
Please contact Hauser for further
information.
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1
3
2
BD
SD