Emerson Rosemount 398R, Reference Manual

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Maintenance 37
Reference Manual Maintenance
00809-0100-3098 February 2019
9. Make sure that the male connector body (E) is sufficiently tightened.
10. The sensor will “click” into place by pulling the sensor tube away from the junction box,
but will not move from side to side or pull clear of the male connector.
11. If the sensor tube is correctly attached to the junction box, wrench tighten hex nut (F) on
male connector body (E). See Figure 6-1.
12. Do not put the sensor tube in a vise or use a pipe wrench to tighten the hardware as these
will damage the sensor. If sensor tube is not correctly attached to the junction box, loosen
hex nut (F) and repeat.
13. Connect the sensor wires to the terminals on the printed circuit board in the junction box
in the manner recommended on the junction box cover,and reattach the BNC connector
to the preamp.
14. Screw on the cover of the junction box aside. Discard sensor tube.
15. Insert the sensor in the process fitting. Stop it against the closed ball valve. Slide the
process-end male connector down the sensor tube to mate with the process fitting.
Tighten the male connector into the process fitting.
16. Pull back hard on the sensor assembly, as if trying to remove the sensor, to be certain that
the sensor cannot come free from the valve assembly and male connector. The built-in
retraction stop collar at the end of the sensor will butt against the shoulder of the male
connector.
17. Open ball valve and position the sensor at the desired insertion depth and orientation.
Using a crescent or open end wrench, tighten the hex nut (B) to secure the sensor in place.
See Figure 6-5.
Note: A stainless steel ferrule is available if the Teflon ferrule does not adequately grip. Be careful
and avoid over tightening. This can damage the sensor tube.
If the sensor is to be stored, the rubber boot should be filled with 7pH buffer solution and replaced
on sensor tip until ready to use.
Figure 6-5: Male Connector Tightening Diagram
If the male connector leaks during insertion or retraction, replace the O-ring (PN 9550167) in the male
connector A.
CAUTION