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98MANALIDP10AV Rev. A 8/16/11
For wiring runs with high resistance due to long lengths or other reasons, or for maximum
accuracy, a four-wire connection as shown in Figure 15 can be used to provide input-output
isolation. With four-wire configuration, voltage drop in the power supply loop does not
affect measurement accuracy.
To wire a transmitter, proceed with the following steps.
1. Screw in cover lock (if present) and remove the field terminals compartment cover by
rotating it counterclockwise.
2. Run the supply voltage and output wires (0.50 mm
2
or 20 AWG, typical) through
one of the transmitter conduit connections as shown in Figure 8. If four-wire
connection is used, use twisted single pair on the output side to protect the 1 to
5 V dc output from electrical noise.
NOTE
Do not run transmitter wires in same conduit as mains (ac power) wires.
3. If shielded cable is used, earth (ground) the shield at the receiver only. Do not ground
the shield at the transmitter. Cut and/or tape the shield so it cannot contact the metal
housing.
4. Plug unused conduit connection with the PG 13.5 or 1/2 NPT metal plug provided
(or equivalent). To maintain specified explosion proof and dust-ignition proof
protection, plug must engage a minimum of five full threads. Thread sealant is
recommended.
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