Emerson Rosemount 3308 Series Reference Manual page 30

Installation
February 2020
Figure 3-5: Existing Displacer Chamber
A. Replace chamber flange
B. Probe length
C. Displacer length
Considerations when changing to Rosemount 3308 Series:
• The Rosemount 3308 Series flange choice and probe length must be correctly matched
to the chamber. Both standard ASME and EN (DIN), as well as proprietary chamber
flanges, are available. See
• See
• See
Table 3-5: Required Probe Length in Chambers
Chamber manufacturer
Major torque-tube manufacture (249B, 249C,
249K, 249N, 259B)
Masoneilan
proprietary flange
Other - torque tube
Magnetrol
Others - spring operated
(1) If flushing ring is used, add the ring height to the probe length.
(2) For other manufacturers, there are small variations. This is an approximate value; actual length
should be verified.
(3) Lengths vary depending on model, SG, and rating, and should be verified.
For additional information, see the Replacing Displacers with Guided Wave Radar
Technical
Probe type in chamber considerations
When installing a Rosemount 3308A in a chamber, the single lead probe is recommended.
The probe must not touch the chamber wall, should extend the full height of the chamber,
but not touch the bottom of the chamber.
30
Proprietary flanges
Table 3-8 for guidelines on which disc size to use.
Table 3-5 for guidelines on the required probe length.
™
(torque tube operated),
(2)
(3)
®
(spring operated)
(2)
Note.
to identify the proprietary flanges.
(1)
Probe length
Displacer + 9 in. (229 mm)
Displacer + 8 in. (203 mm)
Displacer + 8 in. (203 mm)
Displacer + between 7.8 in. (195 mm) to 15 in.
(383 mm)
Displacer + 19.7 in. (500 mm)
Reference Manual
00809-0100-4308
Rosemount 3308 Series