
Reference Manual
00809-0100-4716, Rev JA
May 2008
Rosemount 3095 MultiVariable
5-8
DISASSEMBLY
PROCEDURES
Read the following information carefully before disassembling a transmitter.
General information concerning the process sensor body and electrical
housing follow. Figure 2-3 on page 2-6 shows an exploded view of the
transmitter.
Removing the
Process Sensor Body
NOTE
Do not leave inoperable transmitters in service.
Be aware of the following:
•
The process flange can be detached by removing the four flange bolts
and the two alignment screws that secure it.
•
Isolating diaphragms can be cleaned with a soft rag, mild cleaning
solution, and clear water rinse.
•
The flange adapters and process flange can be rotated or reversed for
mounting convenience.
•
When removing 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, they can be
reused.
•
If the teflon sensor module O-rings have been replaced, re-torque the
flange bolts after installation to compensate for cold flow.
Removing the
Electrical Housing
Electrical connections are located in a compartment identified as FIELD
TERMINALS on the electronics housing. Unscrew the cover on the Field
Terminal side to access the signal terminal block.
Remove the signal terminal block by loosening the two small screws located
at the 9 o'clock and 4 o'clock positions, then pulling the terminal block straight
out to disconnect the block from the post connectors.
Sluggish Output
Response/Drift
DIFFERENTIAL PRODUCER
• Check for restrictions at the differential producer.
IMPULSE PIPING
• Check for leaks or blockage.
• Ensure that blocking valves are fully open
• Check for sediment in the transmitter process flange.
• Check for entrapped gas in liquid lines and for liquid in gas lines.
• Ensure that the density of fluid in impulse lines is unchanged.
• Make sure that process fluid has not frozen within the process flange.
TRANSMITTER ELECTRONICS
• Connect a personal computer and using the EA Software, select Diagnostics, Error Info
to detect any electronic failures.
• Confirm that damping is correctly set.
• Confirm that the electronics housing is properly sealed against moisture.
SENSING ELEMENT
• The sensing element is not field repairable and must be replaced if found to be defective. Check for obvious
defects, such as a punctured isolating diaphragm or fill fluid loss, and contact your nearest Rosemount Service
Center.
• Confirm that the electronics housing is properly sealed against moisture.
Table 5-6. Unexpected Process Variable (PV) Readings
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