Disassembly Procedures; Remove From Service; Remove Terminal Block; Remove The Electronics Board - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0300-4101, Rev BB
6.7

Disassembly procedures

Do not remove the instrument cover in explosive atmospheres when the circuit is live.
6.7.1

Remove from service

Follow these steps:
1. Follow all plant safety rules and procedures.
2. Isolate and vent the process from the transmitter before removing the transmitter from
service.
3. Remove all electrical leads and disconnect conduit.
4. Remove the transmitter from the process connection.
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5. Clean isolating diaphragms with a soft rag and a mild cleaning solution, and rinse with
clear water.
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6.7.2

Remove terminal block

Electrical connections are located on the terminal block in the compartment labeled "FIELD
TERMINALS."
1. Remove the housing cover from the field terminal side.
2. Loosen the two small screws located on the assembly in the 9 o'clock and 5 o'clock
positions.
3. Pull the entire terminal block out to remove it.
6.7.3

Remove the electronics board

The transmitter electronics board is located in the compartment opposite the terminal side.
To remove the electronics board perform the following procedure:
1. Remove the housing cover opposite the field terminal side.
2. If you are disassembling a transmitter with a LCD display, loosen the two captive screws
that are visible on the right and left side of the meter display.
3. Loosen the two captive screws that anchor the board to the housing. The electronics
board is electrostatically sensitive; observe handling precautions for static-sensitive
components. Use caution when removing the LCD display as there is an electronic pin
connector that interfaces between the LCD display and electronics board. The two
screws anchor the LCD display to the electronics board and the electronics board to the
housing.
Troubleshooting
The Rosemount 2051C Transmitter is attached to the process connection by four
bolts and two cap screws. Remove the bolts and separate the transmitter from the
process connection. Leave the process connection in place and ready for
re-installation.
The Rosemount 2051T Transmitter is attached to the process by a single hex nut
process connection. Loosen the hex nut to separate the transmitter from the process.
Do not wrench on neck of transmitter.
Do not scratch, puncture, or depress the isolating diaphragms.
For the Rosemount 2051C, whenever removing the process flange or flange
adapters, visually inspect the PTFE O-rings. Replace the O-rings if they show any signs
of damage, such as nicks or cuts. Undamaged O-rings may be reused.
Troubleshooting
November 2016
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