Sensor Tube Replacement - Emerson Rosemount 385 Reference Manual

Maintenance
February 2019
4.3

Sensor Tube Replacement

Replacement of a Rosemount 385 Sensor involves the removal and installation of two sets of male
connectors, one at the process end of the sensor, and the other at the junction box end. Refer to
Section 4.1 for removal of the sensor. Refer to Figure 4-2.
1.
2.
3.
NOTICE
If stainless steel ferrule was used, male connector body (A) will have to be discarded with the sensor tube.
Save male connector if Teflon ferrule was used. Set aside for future use.
4.
Figure 4-2: Sensor Tube Replacement
16
The junction box with attached male connector must be recovered from the old sensor
for reuse. Unscrew the junction box cover and set aside. Disconnect electrical connections
from printed circuit board inside junction box. Disconnect BNC connector to preamp.
Unscrew hex nut (D) from male connector body (C). Separate junction box from used
sensor. Set aside.
Pry off split ferrule from sensor and set aside for reuse. Remove hex nut (D) and set aside
for reuse. Check that the internal O-ring is in place in the male connector body (C) attached
to the junction box.
Remove hex nut (B) from male connector body (A) at process end of sensor and set aside.
Slide the Teflon ferrule and the male connector off sensor in the direction of junction box
and set aside. Discard sensor tube.
Discard used O-ring from male connector body (A). Coat new O-ring with a thin film of the
O-ring lubricant provided. Position it in the machined Oring groove in place of the
discarded O-ring.
Reference Manual
00809-0100-3385
Maintenance