Reference Manual
00809-0100-4728, Rev HA
December 2002
Models 644H and 644R
2-14
Option 2:
1.
Connect sensor wiring shield to the transmitter housing (only if the
housing is grounded).
2.
Ensure the sensor shield is electrically isolated from surrounding
fixtures that may be grounded.
3.
Ground signal wiring shield at the power supply end.
Option 3:
1.
Ground sensor wiring shield at the sensor, if possible.
2.
Ensure that the sensor wiring and signal wiring shields are electrically
isolated from the transmitter housing.
3.
Do not connect the signal wiring shield to the sensor wiring shield.
4.
Ground signal wiring shield at the power supply end.
Grounded Thermocouple Inputs
1.
Ground sensor wiring shield at the sensor.
2.
Ensure that the sensor wiring and signal wiring shields are electrically
isolated from the transmitter housing.
3.
Do not connect the signal wiring shield to the sensor wiring shield.
4.
Ground signal wiring shield at the power supply end.
4–20 mA loop
Sensor Wires
Shield ground point
Transmitter
4–20 mA loop
Sensor Wires
Shield ground point
Transmitter
4–20 mA loop
Sensor Wires
Shield ground point
Transmitter
Summary of Contents for Rosemount 644h
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