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The FISCO Concept allows interconnection of intrinsically safe apparatus to associated
apparatus not specifically examined in such combination. The criteria for interconnection is
that the voltage (Ui or Vmax), the current (Ii, or Imax) and the power (Pi, or Pmax) which
intrinsically safe apparatus can receive and remain intrinsically safe, considering faults, must
be equal to or greater than the voltage (Uo or Voc or Vi), the current (lo or Isc or li), and the
power (Po or Pmax) levels which can be delivered by the associated apparatus, considering
faults and applicable factors. In addition, the maximum unprotected capacitance (Ci) and
inductance (Li) of each apparatus (other than the termination) connected to the fieldbus must
be less than or equal to 5 nF and 10 μH respectively.
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 wiring
The ATEX certificate listed on the nameplate
can be downloaded from the product page of our website at: www.siemens.com/LR200.
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 (US only)
FM Class 1, Div 2 connection drawing
number 23650537 can be downloaded from the product page of our website at:
www.siemens.com/LR200. 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 EN-10
SITRANS LR200 (PROFIBUS PA) – QUICK START MANUAL
on page 11
A5E32153438

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