7ML19985QX81 SITRANS LR250 (HART) – QUICK START MANUAL Page EN-7
mmmmm
English
2. Strip the cable jacket for approximately 70 mm (2.75") from the end of the cable, and
thread the wires through the gland.
3. Connect the wires to the terminal as shown: the polarity is identified on the terminal
block.
4. Ground the device according to local regulations.
5. Tighten the gland to form a good seal.
Connecting HART
Typical PLC/mA configuration with HART
Wiring setups for hazardous area installations
There are two wiring options for hazardous area installations. In all cases, check the device
nameplate and process device tag to verify the approval rating.
Reference drawings are available from the product page of our website at:
www.siemens.com/LR250
, or in Appendix A, on the pages noted below.
Reference Drawing
Page
No.
FM/CSA Intrinsically Safe connection drawing (23650653) A- 1
FM/CSA (Non-incendive) Class 1, Div 2 connection drawing (23650673) A- 2
2 mm lid-lock
set screw.
1. Use a 2 mm Allen key to loosen the lid-lock set
screw. Then using a screwdriver for leverage if
necessary, unscrew the cover.
cable shield
(if used)
active PLC
HART modem
SITRANS
LR250
power
supply
Notes:
• Depending on the system
design, the power supply
may be separate from the
PLC, or integral to it.
• Loop resistance (total of
cable resistance plus 250
Ohm [resistor]) must be
less than 550 Ohm for the
device to function
properly.
R= 250 Ω
HART
communicator
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