Rosemount Manual Supplement: Rosemount 3051 Pressure Transmitter with HART protocol®-Sensor Module Replacement Manuals & Guides

Model 3051

00809-0400-4001

English

Rev. BA

Sensor Module
Replacement

SAFETY MESSAGES

Procedures and instructions in this manual may require special
precautions to ensure the safety of the personnel performing the operations.
Information that raises potential safety issues is indicated by a warning
symbol ( ). Refer to the following safety messages before performing an
operation preceded by this symbol.

Warnings

Explosions can result in death or serious injury.

• Do not remove the instrument cover in explosive environments when the
circuit is alive.

• Both transmitter covers must be fully engaged to meet explosion-proof
requirements.

• Before connecting a communicator in an explosive atmosphere, make
sure the instruments in the loop are installed in accordance with
intrinsically safe or nonincendive field wiring practices.

BEFORE YOU DISASSEMBLE THE TRANSMITTER

Maintenance procedures differ for improved and previous style transmitter
housings. Verify the specific physical characteristics of your transmitter
before you begin any maintenance procedures.

4.0 in.

(105 mm)

3.2 in.

(80 mm)

IMPROVED

PREVIOUS

DISASSEMBLY PROCEDURES

Do not remove the instrument cover in explosive atmospheres when the
circuit is alive.

Remove the Transmitter from Service

NOTE

Once you have determined a transmitter to be inoperable, remove it from
service.

Be aware of the following:

䡲 Isolate and vent the process from the transmitter before removing

the transmitter from service.

䡲 Remove all electrical leads and conduit
䡲 Detach the process flange by removing the four flange bolts and the

two alignment screws that secure it.

䡲 Do not scratch, puncture, or depress the isolating diaphragms.
䡲 Clean the isolating diaphragms with a soft rag and a mild cleaning

solution, and rinse with clear water.

䡲 Whenever you remove the process flange or flange adapters,

visually inspect the Teflon O-rings. Replace the O-rings if they show
any signs of damage, such as nicks or cuts. If they are undamaged,
you may reuse them.

2

Remove the Electronics Board

Step 1

1. Remove the housing cover opposite the field terminal side.

2. Loosen the two captive screws that anchor the board. The circuit board
is electrostatically sensitive. To prevent damage to the circuit board, be
sure to observe handling precautions for static-sensitive components.

3. Gently pull the electronics board out of the housing to disconnect
the power connection. With the board free of the housing, only the
sensor module ribbon cable connects the board to the housing.

NOTE

Previous versions of the electronics board use a snap-in power plug and
receptacle. Carefully unsnap the power plug from the receptacle to free the
board from the power cord.

Step 2 Step 3

3051-053AB, 054AB, 055AB

Step 4

4. Disconnect the sensor module ribbon cable to release the
electronics board from the transmitter.

3051-056AB

3