User's Manual

Table Of Contents
A5E32337683 SITRANS LR260 (HART) – OPERATING INSTRUCTIONS Page 21
mmmmm
Wiring
1. Strip the cable jacket for approximately
70 mm (2.75") from the end of the cable, and
thread the wires through the gland
1)
.
2. Connect the wires to the terminals as
shown: the polarity is identified on the
terminal block.
3. Ground the instrument according to local
regulations.
4. Tighten the gland to form a good seal.
Connecting HART
2)3)
1)
If cable is routed through conduit, use only approved suitable-size hubs for
waterproof applications.
2)
Depending on the system design, the power supply may be separate from the
PLC, or integral to it.
3)
Loop resistance (total of cable resistance plus 250 Ohm [resistor]) must be less
than 550 Ohm for the device to function properly.
cable shield
(if used)
active PLC
HART modem
SITRANS LR260
power supply
2
Typical PLC/mA configuration with HART
R= 250
3
HART
communicator