Emerson Rosemount 3051 User manual

Model 3051

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.

00809-0400-4001

English

Rev. BA

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.

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.

4.0 in.

(105 mm)

3.2 in.

(80 mm)

IMPROVED PREVIOUS

Remove the Electronics Board

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.

4. Disconnect the sensor module ribbon cable to release the

electronics board from the transmitter.

Step 1

3051-053AB, 054AB, 055AB

Step 2 Step 3

3051-056AB

Step 4

Remove the Sensor Module from the Electronics Housing

1. Carefully tuck the cable connector completely inside the internal

shroud.

IMPORTANT

Do not remove the housing until after you tuck the cable connector

completely inside of the internal shroud. The shroud protects the cable from

damage that can occur when you rotate the housing.

2. Loosen the housing rotation set screw with a 5/64-inch hex wrench

and back off one full turn.

IMPORTANT

To prevent damage to the sensor module ribbon cable, disconnect it from the

electronics board before you remove the sensor module from the electrical

housing.

3. Unscrew the housing from the module, making sure the shroud and

sensor cable do not catch on the housing.

IMPORTANT

Make sure the sensor ribbon cable and internal shroud remain completely

free of the housing as you rotate it. Damage can occur to the cable if the

internal shroud and sensor cable rotate with the housing.

Step 1

3051-057AB, 059AB, 060AB

Step 2 Step 3

REASSEMBLY PROCEDURES

Attach the Sensor Module to the Electronics Housing

Follow these procedures carefully to ensure proper reassembly:

1. Inspect all cover and housing (non-process-wetted) O-rings and

replace if necessary. Lightly grease with silicone lubricant to ensure

a good seal.

2. Carefully tuck the cable connector completely inside of the internal

shroud. To do this, turn the shroud and cable counterclockwise one

rotation to tighten the cable.

3. Lower the electronics housing onto the module, and guide the internal

shroud and cable through the housing and into the external shroud.

4. Turn the housing clockwise to fasten it to the module.

IMPORTANT

To prevent damage to the cable connector, watch the cable and shroud as

you attach the housing to the module. Make sure the cable connector does

not slip out of the internal shroud and begin to rotate with the housing.

Reinsert the cable connector into the shroud if it escapes before the housing

is fully fastened.

5. Thread the housing completely onto the sensor module. To comply

with explosion-proof requirements, the housing must be no more

than one full turn from flush with the sensor module.

6. Tighten the housing rotation set screw using a 5/64-inch hex wrench.

Step 2

3051-062AB, 060AB, 059AB

Step 3 Step 6

Attach the Electronics Board

1. Remove the cable connector from its position inside of the internal

shroud, and attach it to the electronics board.

2. Insert the electronics board into the housing, making sure that the

posts from the electronics housing properly engage the receptacles

on the electronics board.

NOTE

If you are reassembling a previous version of the electronics board, or if you

are placing a shrouded version of the electronics board in a previous version

of the housing, attach the snap-in power connection to the receptacle on the

board with the black and red wires routed toward the center of the board and

below the white reed switch holder.

3. Tighten the captive mounting screws.

4. Replace the electronics housing cover. The transmitter covers must

engaged metal-to-metal to ensure a proper seal and to meet

explosion-proof requirements.

NOTE

Electronics board revision 5.3.163 or later (all shrouded designs) have

increased functionality that allows verification testing of alarm current levels.

If you repair or replace the transmitter electronics board, sensor module, or

LCD meter, verify the transmitter alarm level before you return the

transmitter to service. Refer to the Model 3051 Product Manual, Rosemount

doc. no. 00809-0100-4001 for more information.

Step 1

3051-053AB, 054AB, 055AB

Step 3 Step 4

Reassemble the Process Sensor Body

1. Visually inspect the Teflon sensor module O-rings. If the O-rings are

undamaged, you may reuse them. If the O-rings show signs of

damage, such as nicks or cuts, or if there is any doubt about their

ability to seal properly, replace them with new O-rings.

IMPORTANT

If replacing the O-rings, take care not to scratch or deface the

O-ring grooves or the surface of the isolating diaphragm while you remove

the damaged O-rings.

2. Install the process flange on the sensor module. To hold the process

flange in place, install the two hex head alignment screws. These

screws are not pressure retaining and need only be finger tight. Do

not overtighten; this will affect the module/flange alignment.

3. Where applicable, install the appropriate flange bolts:

䡲For installations requiring a 1/4–18 NPT mounting, install the four 1.75-

inch process flange bolts. First finger-tighten, then tighten the bolts

incrementally in a cross pattern until they are tightened to the appropriate

torque values. When fully tightened, the bolts should extend through the

top of the module housing. Refer to The Model 3051 Product Manual

(Rosemount pub. no. 00809-0100-4001) for complete bolt installation

information and torque values.

䡲For installations requiring a 1/2–14 NPT mounting, hold the flange

adapters and flange adapter O-rings in place while finger-tightening

the four 2.88-inch process flange/adapter bolts (use two 2.88-inch

bolts and two 1.75-inch bolts for gage pressure configurations).

Tighten the bolts incrementally in a cross pattern until they are

tightened to the appropriate torque values. When fully tightened, the

bolts should extend through the top of the module housing. Refer to The

Model 3051 Product Manual (Rosemount pub. no. 00809-0100-4001) for

complete bolt installation information and torque values.

䡲For installations with a three-valve manifold (differential pressure

applications only), align the process flange with the three-valve

manifold, and finger-tighten the four 2.25-inch manifold flange bolts

following the procedure outlined above. Tighten the bolts

incrementally in a cross pattern until they are tightened to the

appropriate torque values. When fully tightened, the bolts should extend

through the top of the module housing. Refer to The Model 3051 Product

Manual (Rosemount pub. no. 00809-0100-4001) for complete bolt

installation information and torque values. Install flange adapters on the

process end of the three-valve manifold using the 1.75-inch flange

bolts supplied with the transmitter.

Rosemount Inc.

8200 Market Boulevard

Chanhassen, MN 55317 USA

Tel 1-800-999-9307

Telex 4310012

Fax (612) 949-7001

http://www.rosemount.com

4. If you replaced the Teflon sensor module O-rings, torque the flange bolts

after installation to compensate for cold flow.

5. Install the drain/vent valve:

a. Apply sealing tape to the threads on the seat. Starting at the base of

the valve with the threaded end pointing toward the installer, apply two

clockwise turns of the sealing tape.

b. Take care to place the opening on the valve so that process fluid will drain

toward the ground and away from personnel when the valve is opened.

c. Tighten the drain/vent valve to 70 in-lb (0.5 N-m).

NOTE

After replacing O-rings on Range 1 transmitters and re-installing the process

flange, expose the transmitter to a temperature of 185 °F (85 °C) for two hours.

Then re-tighten the flange bolts in a cross pattern, and again expose the

transmitter to a temperature of 185 °F (85 °C) for two hours before calibration.

¢00809-0400-4001m¤

00809-0400-4001, Rev. BA

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