Emerson Rosemount 6888A, Reference Manual

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Procedure
1. Remove cover (A) from the DR probe housing.
2. Disconnect the power and signal wires from the DR terminal board (C).
3. Remove the three screws (E) securing the plastic cover (B) and DR terminal board (C)
to mounting plate (D).
4. Disconnect the two wire harness conenctors from the back of the transmitter board.
Replacement DR terminal boards come in two configurations:
a. DR terminal board with thermal pad and mounting screws
b. DR terminal board, thermal pad, plastic cover, mounting plate, and mounting
screws
5. If the mounting pad is being replaced, remove the four screws (F) securing the plate
to the housing. Install the new mounting plate using four screws.
Replacement screws are provided if any become lost or damaged.
6. Reconnect the two wire harness connectors to the back of the DR terminal board.
The connectors are different and individually keyed to prevent misconnection.
7. Carefully push the wire harnesses through the hole in the mounting plate and align
the DR terminal board with plastic cover over the three standoffs on the mounting
plate.
8. Install the three screws to secure the board to the mounting plate.
Replacement screws are provided if any become lost or damaged.
9. Reconnect the power and signal wires to the transmitter board.
10. Reinstall the cover to the DR probe housing.
11. Reapply power to the DR probe.
5.4.4 Heater strut replacement
This section covers heater strut replacement. Do not attempt to replace the heater strut
until all other possibilities for poor performance have been considered.
If heater strut replacement is needed, order a replacement heater strut kit (
Table 6-1 ).
Refer to Figure 5-3 for item letter references.
WARNING!
BURNS
Use heat resistant gloves and clothing when removing probe. Do not attempt to work on the
probe until it has cooled to room temperature. The probe can be as hot as 427 °C (800 °F). This
can cause severe burns.
Maintenance and service
Reference Manual 103