Emerson 00809-0100-4514, 1154 manual Electrical Housing Disassembly, Rosemount, Reference Manual

Rosemount 1154

Reference Manual

00809-0100-4514, Rev BA January 2008

Electrical Housing Disassembly

Removing Sensor Module from Electrical Housing

REASSEMBLY

PROCEDURE

1.The signal terminals and test terminals are accessible by unscrewing the cover (1) on the terminal side. This compartment is identified as “terminal side” on the nameplate. The terminals are permanently attached to the housing and must not be removed.

2.Circuit boards are located in a separate compartment identified as “Circuit Side” on the nameplate. Remove power from the transmitter before removing the circuit side cover. Unscrew the cover (1) on the circuit side to access the circuit boards. A special cover wrench (RMT P/N 01153-0382-0001) is available from Rosemount to remove and replace the housing covers.

3.Unplug the amplifier board (6) after removing 3 holding screws (7).

4.The header assembly board (4) is permanently attached to the sensor module (12) and contains the temperature-compensating resistors. Carefully pull this board off the bayonet pins and rotate the board 180 degrees about the axis formed by the connecting leads. This allows access to the calibration board (5).

5.Disconnect the calibration board (5) by aligning the zero and span adjust screws so that their slots are perpendicular to the board. Remove the board by inserting a 6–32 screw in the rivnut on the board and carefully pulling the board off the bayonet pins.

6.If replacement of the zero and span adjustment screws (16) is necessary, remove the nameplate (17) and detach the snap rings (18) inside the housing.

1.Remove flanges per Process Flange Removal Section on page 5-4.

2.Remove amplifier board and calibration board as described in the Electrical Housing Disassembly Section above.

3.Loosen the lock nut (9).

4.Unscrew the sensor module (12) from the electronics housing, simultaneously turning the header board and leads to prevent them from being twisted or damaged. The threaded connection has a sealing compound on it and must be broken loose. Be careful not to damage the isolating diaphragms when unscrewing the sensor module. Then carefully pull the header assembly board (4) through the hole.

5.The sensor module (12) is a welded assembly and cannot be further disassembled.

NOTE

Numbers in parentheses refer to item numbers in Figure 5-2 on page 5-5.

NOTE

The Rosemount 1154 Pressure Transmitter contains electronic circuit boards which may be static sensitive.

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