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

Troubleshooting
July 2017
6.4

Disassembly procedures

Do not remove the instrument cover in explosive atmospheres when the circuit is live.
6.4.1

Removing from service

Follow these steps:
1. Follow all plant safety rules and procedures.
2. Power down device.
3. Isolate and vent the process from the transmitter before removing the transmitter from service.
4. Remove all electrical leads and disconnect conduit.
5. Remove the transmitter from the process connection.
a. The Rosemount 2051C Transmitter is attached to the process connection by four bolts and two
b. The Rosemount 2051T Transmitter is attached to the process by a single hex nut process
6. Do not scratch, puncture, or depress the isolating diaphragms.
7. Clean isolating diaphragms with a soft rag and a mild cleaning solution, and rinse with clear water.
8. For the Rosemount 2051C, whenever you remove 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.
6.4.2

Removing 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 relative
to the top of the transmitter.
3. Pull the entire terminal block out to remove it.
6.4.3

Removing the electronics board

The transmitter electronics board is located in the compartment opposite the terminal side. To remove
the electronics board see
1. Remove the housing cover opposite the field terminal side.
2. If you are disassembling a transmitter with a LOI/LCD display, loosen the two captive screws that are
visible (See
the electronics board and the electronics board to the housing.
80
cap screws. Remove the bolts and screws and separate the transmitter from the process
connection. Leave the process connection in place and ready for re-installation. Reference
"Installation procedures" on page 30
connection. Loosen the hex nut to separate the transmitter from the process. Do not wrench on
neck of transmitter. See warning in
Figure 4-2 on page 51
Figure 4-1 on page 50
for coplanar flange.
"In-line process connection" on page
and perform following procedure:
for screw locations). The two screws anchor the LOI/LCD display to
Reference Manual
00809-0100-4107, Rev CA
38.
Troubleshooting