Emerson Rosemount 3900 Quick Start Manual page 15

May 2023
Figure 2-8: Exploded view of ball valve assembly kit (PN 23765-00)
Ball valve kit (PN 23765-00) includes a 1¼-in. by 1¼-in. nipple, 1¼-in.
ball valve, and all packing adapter pieces shown.
A. Stop ring with three set screws (PN 33579-00)
B. Packing bushing (PN 4357M)
C. Packing rings (PN 9160410). Install metal ring last.
D. Retainer (PN 33577-00)
E. Packing adapter (PN 33578-00)
F. 1¼-in. NPT ball valve (PN 9340078)
G. 1¼-in. male NPT nipple (PN 4342M)
H. Retractable pH sensor
Procedure
1. Securely connect the ball valve to the process.
2. Make sure the ball valve is closed and the system pressure is
at or below the maximum rated retraction pressure for the
sensor length you are using before proceeding.
Quick Start Guide
WARNING
Before removing the sensor, be absolutely certain that the
process pressure is reduced to 0 psig (0 barg) and the
process temperature is lowered to a safe level.
Do not insert or retract retractable sensors when process
pressure is above the specified retraction pressure limit for
the length of sensor being used.
For 21-in. (533 mm) length sensors the maximum allowed
retraction pressure is 64 psig (5.4 barg).
For 36-in. (914 mm) length sensors the maximum allowed
retraction pressure is 35 psig (3.4 barg).
Quick Start Guide
15