Siemens SITRANS LR250 Guide De Mise En Service Rapide page 11

Connecting HART
Typical PLC/mA configuration with HART
R= 250 
power
supply
SITRANS
LR250
Wiring setups for hazardous area installations
There are six wiring options for hazardous area installations. In all cases, check the device
nameplate and process connection tag to verify the approval rating.
1. Intrinsically Safe wiring
Device nameplate (ATEX/IECEX/INMETRO/C-TICK)
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.
The IECEx certificate listed on the nameplate can be viewed on the IECEx website. Go to:
http://iecex.iec.ch and click on Ex Equipment Certificates of Conformity then enter the
certificate number IECEx SIR 05.0031X.
1)
Total loop resistance = cable resistance plus 250 Ohm (resistor).
2)
Curve 1: General Purpose, Intrinsically Safe, Non-Sparking/Energy Limited/ Non-incendive
See either
Curve 2: Flameproof, Increased Safety, Explosion-proof
on page 23 or
A5E31997170
active PLC
HART
modem
HART
communicator
SITRANS LR250 (HART) – QUICK START MANUAL
1) 2)
Notes:
• Depending on the system design,
the power supply may be sepa-
rate from the PLC, or integral to it
• HART resistance
ited according to the allowable
operating area
• Do not connect more than one
HART programming device at a
time.
on page 24.
1)
must be lim-
2)
.
Page EN-9