Emerson Rosemount 2151N Reference Manual page 62

Rosemount 2151N
Process Flange Removal
Electronics Housing
Disassembly
Electronics Assembly Removal
Terminal Block Removal
53
1. Remove the transmitter from service before
disassembling flanges.
2. Remove the two flange cap screws (13).
3. Detach process flange (10) by removing the four large
bolts (11). TAKE CARE NOT TO SCRATCH OR
PUNCTURE THE ISOLATING DIAPHRAGMS.
Identify the orientation of flange with respect to sensor
module for reassembly.
4. Carefully remove the O-rings (C-ring for AP
transmitters) (9). DO NOT REUSE O-RINGS (C-
RING). TAKE CARE NOT TO SCRATCH THE
SEALING SURFACES ON THE PROCESS FLANGE
AND SENSOR MODULE.
Remove power from the transmitter before removing either the
terminal side or circuit side cover (1).
1. The electronics assembly (4) is accessible by
unscrewing the cover (1) on the electronics side. This
compartment is not specifically identified by notes on
the housing (5), but is located opposite of the side
marked "FIELD TERMINALS."
2. Before removing the electronics assembly, align the
zero and span adjustment screws so that their slots
are perpendicular to the board, as shown in Figure 5-
4.
3. Unscrew the two 6-32 captive screws holding the
electronics assembly to the housing and pull the
electronics assembly from the housing (see Figure 5-
4).
4. Unclip and disconnect the connector plug from the top
of the sensor module (8) to completely remove the
electronics assembly (see Figure 5-5). To remove
connector plug, apply even pressure to both clips and
pull the connector body up from the sensor module.
DO NOT PULL ON THE CABLE WIRES.
1. The signal terminals and test terminals are accessible
by unscrewing the cover (1) on the terminal side. This
compartment is identified by the "FIELD TERMINALS"
notes on the sides of the electronics housing (5).
2. The terminal block assembly (6) is removed by
removing the two 6-32 screws and pulling the terminal
block assembly out of the housing (see Figure 5-6).
Reference Manual
00809-0000-4851 Rev AD
December 2023
WARNING
Maintenance & Troubleshooting