Emerson Rosemount Oxymitter 4000, Reference Manual, Page: 159 / 198

Prerequisites
Follow the instructions in Remove probe to remove the transmitter from the stack or duct.
CAUTION
Damage to the aluminum probe housing can occur.
Do not force the probe housing when installing or removing it from the integral electrical
barrier/feed-through.
Procedure
1. Remove four screws (22) and washers (21) from the probe tube assembly (23).
Remove the probe tube assembly from the housing (11).
2. Disconnect the heater and signal wire connectors from the mating connectors on
the heater strut assembly (32).
Note
The integral electrical barrier/feed-through is thread-locked into the electrical
housing and cannot be removed.
3. Make sure the O-ring (31) is in good condition. Replace the O-ring if damaged.
4. Make sure that the conduit port of the electronic housing is on the same side as the
CAL and REF gas ports. Install four washers (21) and screws (22). Tighten screws.
5. Follow the instructions in Replace probe to replace the probe in the stack or duct.
9.3.4 Replace electronic assembly
WARNING
Opening the electronics housing will cause the loss of all hazardous permits. Opening the
electronics housing in hazardous areas may cause an explosion resulting in loss of
property, severe personal injury, or death.
You may need to get a hot work permit from your company safety officer before opening
the electronics housing.
Refer to Figure 2-14 if you are using integral electronics or Figure 2-18 if you are using
remote electronics. The numbers in the following steps correspond to the numbers of the
items in those figures.
Procedure
1. Remove screw (18), cover lock (19), and captive washer (20), securing cover (1).
Remove the cover.
2. Depress and remove the J1 (cell and thermocouple) connector from the J1 socket.
See Figure 9-3 .
Reference Manual Maintenance and service
00809-0100-4340 October 2019
Rosemount Oxymitter 4000 159