Siemens SITRANS LR200 Kurzanleitung Seite 7

Pressure Application
WARNINGS:
• Never attempt to loosen, remove, or disassemble process connection or instru-
ment housing while vessel contents are under pressure.
• Improper installation may result in loss of process pressure.
Pressure Equipment Directive, PED, 97/23/EC
Siemens Level Transmitters with flanged, threaded, or sanitary clamp type process mounts
have no pressure-bearing housing of their own and, therefore, do not come under the Pressure
Equipment Directive as pressure or safety accessories, (see EU Commission Guideline 1/8).
Nozzle design
Notes:
• For nozzles 100 mm (4") in length or shorter use the 100 mm (4") shield.
• For nozzles 250 mm (10") in length or shorter use the 250 mm (10") shield.
• For horn and waveguide versions see the full manual which can be downloaded from
www.siemens.com/LR200.
• The end of the shield section should protrude a
minimum of 10 mm (0.4") to avoid false echoes being
reflected from the nozzle.
Location on a manhole cover
• A manhole cover is typically a covered nozzle with a
diameter 610 mm (24") or greater.
• For optimum signal conditions, locate the antenna
off-center, typically 100 mm (4") from the side.
Nozzle location
WARNING: For vessels with conical or parabolic tops, avoid mounting the
instrument at the centre. (The concavity of the top can focus echoes into the centre,
giving false readings.)
Note: Under certain circumstances, it may be acceptable to mount the device at the centre of
a flat-topped tank. Please discuss this with your local Siemens representative.
Coni
Conical
A5E31993614
Fl at
Flat
Parabolic
SITRANS LR200 (HART) – QUICK START MANUAL
shield
preferred
undesirable
10 mm
(0.4")
100 mm (4")
Page EN-5