Emerson 644 manual Grounded Thermocouple Inputs

Rosemount 644

Reference Manual

00809-0400-4728, Rev AA June 2011

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.

Sensor Wires

Transmitter

Shield ground point

FOUNDATION Fieldbus segment

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.

Sensor Wires

Transmitter

Shield ground point

FOUNDATION Fieldbus segment

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.

Sensor Wires

Transmitter

Shield ground point

FOUNDATION Fieldbus segment

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