User's Manual

Table Of Contents
7ML19985KB01 SITRANS LR560 (mA/HART) – INSTRUCTION MANUAL Page 23
mmmmm
Wiring
5. Connect the wires to the terminals as shown: the polarity is identified on the
terminal block.
6. Ground the instrument according to local regulations.
7. Tighten the gland to form a good seal.
8. Replace optional display and device lid.
9. Tighten locking screw.
Connecting HART
1)2)
1)
Depending on the system design, the power supply may be separate from the
PLC, or integral to it.
2)
HART resistance (total loop resistance, that is, cable resistance plus 250 Ohm
[resistor]) must be less than 550 Ohm for the device to function properly.
cable gland
(or NPT cable entry)
cable shield
instrument
shield
connection
active PLC
HART modem
SITRANS LR560
power supply
1)
Typical PLC/mA configuration with HART
R= 250 Ω
2)
HART
communicator