Non-Sparking/Energy Limited; Non-Incendive Wiring (Only For Usa/Canada) - Siemens Sitrans LR250 Operating Instructions Manual

In each segment only one active device, normally the associated apparatus, is allowed to
provide the necessary energy for the fieldbus system. The allowed voltage Uo (or Voc or
Vt) of the associated apparatus is limited to the range of 14V dc to 24V dc. All other
equipment connected to the bus cable has to be passive, meaning that they are not
allowed to provide energy to the system, except for a leakage current of 50 μA for each
connected device. Separately powered equipment needs a galvanic isolation to assure
that the intrinsically safe fieldbus circuit remains passive.

2. Non-Sparking/Energy Limited

The ATEX certificate listed on the nameplate
can be downloaded from the product page of our website at: www.siemens.com/LR250. Go
to: Support > Approvals / Certificates.
• For wiring requirements: follow local regulations.
• Approved dust-tight and water-tight conduit seals are required for outdoor
NEMA 4X / type 4X / NEMA 6, IP67, IP68 locations.

3. Non-incendive wiring (only for USA/Canada)

FM/CSA Class 1, Div 2 connection drawing number 23650673
can be downloaded from the product page of our website at: www.siemens.com/LR250. Go
to Support > Installation Drawings > Level Measurement > Continuous - Radar.
• For wiring requirements: follow local regulations.
• Approved dust-tight and water-tight conduit seals are required for outdoor
NEMA 4X / type 4X / NEMA 6, IP67, IP68 locations.
Instructions specific to hazardous area installations
• Refer to
Page 28 SITRANS LR250 (PROFIBUS PA) – OPERATING INSTRUCTIONS
on page 29
7ML19985JF04