Pressure Equipment Directive, Ped, 97/23/Ec; Mounting Location; Nozzle Design; Nozzle Location - Siemens Sitrans LR250 Operating Instructions Manual

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
Guidelines 1/8 and 1/20).

Mounting location

Notes:
• Correct location is key to a successful application.
• Avoid reflective interference from vessel walls and obstructions by following the
guidelines below

Nozzle design

Threaded PVDF Antenna
Min. dia. 50 mm (2")
• The end of the antenna must protrude a minimum of 10 mm (0.4") to avoid false
echoes being reflected from the nozzle.
• Minimum recommended nozzle diameter for the threaded PVDF antenna is 50 mm
(2").
• An antenna extension (100 mm/ 3.93") is available for any version except the
threaded PVDF antenna.

Nozzle location

• Avoid central locations on tall, narrow vessels.
Environment
• Provide an environment
suitable to the housing rating
and materials of construction.
• Provide a sunshield if the
instrument will be mounted in
direct sunlight.
Page 20 SITRANS LR250 (PROFIBUS PA) – OPERATING INSTRUCTIONS
Stainless Steel Horn Antenna
Min.
clearance:
10 mm (0.4")
Min.
clearance:
10 mm (0.4")
preferred
undesirable
ambient temperature
–40 °C to +80 °C
(–40 °F to +176 °F)
process temperature
- with FKM O-ring:
–40 to +200 °C
(–40 to +392 °F)
- with FFKM O-ring:
–20 to +200 °C
(–4 to +392 °F)
7ML19985JF04