Emerson Rosemount 385+ -02, Reference Manual, Page: 25 / 42

4.1 Maintenance
The Rosemount 385+ Sensor is a disposal type sensor and therefore requires only periodic cleaning
and calibration. If the sensor has failed, it should be discarded and replaced.
4.2 Sensor Removal
Please refer to the appropriate paragraph for instructions regarding removal of the sensor for
periodic maintenance.
4.2.1 Retractable Version (Code-02)
1. Be certain system pressure at the sensor is below 64 psig (442 kPa) before proceeding
with the retraction. It is also recommended that the personnel wear a face shield and have
a stable footing. Refer to Figure 4-1.
2. Push in on the sensor using the top of the J-box and slowly loosen the hex nut (B) of the
process end male connector (A).
3. When the hex nut is loose enough, slowly ease the sensor back completely until the
retraction stop collar is reached.
4. Close the ball valve slowly. If there is resistance, the valve may be hitting the sensor. Double
check that the sensor has been retracted to the retraction.
5. The Male Connector Body (A) may now be completely unthreaded from the reducing
coupling and the sensor removed for servicing stop collar.
Section 4: Maintenance
WARNING
System pressure may cause the sensor to blow out with great force unless care is taken during removal.
Make sure the following steps are adhered to.
Do not remove nut at this time.
CAUTION
Failure to withdraw the sensor completely may result in damage to the sensor when the valve is closed.
CAUTION
WARNING
Before removing the sensor from the ball valve, be absolutely certain that the ball valve is fully closed.
Leakage from the male connector threads may indicate that the male connector is still under pressure.
Leakage through a partially open valve could be hazardous, however with the ball valve closed, some
residual process fluid may leak from the connector's pipe threads.
If the male connector leaks during insertion or retraction, replace the O-ring (PN 9550099) in the male
connector A.
CAUTION
Maintenance 19
Reference Manual Maintenance
00809-0100-3386 February 2019