Siemens sitrans LR 400 Instruction Manual page 19

Connecting SITRANS LR 400:
1. Release the cover lock on the connection box with a 3 mm Allen key.
2. Unscrew the cover from the connection box.
3. Push the power cable and signal cable through the cable gland on the right of the
unit, up to the terminal strip. Lay the cable in a bend before the cable gland so that
moisture cannot enter the connection box.
4. Connect the earth conductor of the power supply to the earth terminal
connection box. Adjust the cable length so that the earth conductor would be last to
disconnect if cable is pulled.
5. Tighten the cable screw gland and check the strain relief (pull and turn).
6. Screw the cover onto the connection box and tighten it without using a tool. The
sealing ring must be clean and undamaged.
7. Reattach the cover lock on the connection cover.
8. Connect the earth terminal located between the screw-type cable glands to a
ground connection at your vessel by using a cable with a diameter greater than or
equal to 2.5 mm
For error-free communication via the HART protocol, a load of at least 230 Ω must be
available in the signal circuit.
WARNING:
• To avoid short-circuits, do not connect a load resistance with bare wires in
the connection box.
• The housing cover must not be unscrewed in a hazardous area when the
device is under voltage (power supply, digital outputs on external supply).
Page 16 SITRANS LR 400 (Solids) – INSTRUCTION MANUAL
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