Emerson 3308A Rosemount 3308 Series, Reference Manual

Page: 129 / 198

117
Reference Manual
00809-0100-4308, Rev BA
Appendix A: Reference Data
December 2014
Reference Data
Table A-6. Required Probe Length in Chambers
Probe type in chamber considerations
When installing a Rosemount 3308 in a chamber, the single lead probe is recommended. The
probe length determines if a Single Rigid or Single Flexible probe should be used:

Less than 19.7 ft. (6.0 m):
Rigid Single Probe is recommended. Use a centering disc for probe > 3.3 ft. (1 m). When
mounting space is limited, use a Flexible Single Probe with a heavy weight (option W3)
and centering disc.

More than 19.7 ft. (6.0 m):
Use Flexible Single Probe with a heavy weight (option W3) and centering disc.
Chamber manufacturer Probe length
(1)
(1) If flushing ring is used, add the ring height to the probe length.
Major torque-tube manufacture
(249B, 249C, 249K, 249N, 259B) Dis 9 in. (229 mm)
Masoneilan (Torque tube operated),
proprietary flange Dis 8 in. (203 mm)
Other - torque tube
(2)
(2) For other manufacturers, there are small variations. This is an approximate value, actual length should be verified.
Dis 8 in. (203 mm)
Magnetrol (spring operated)
(3)
(3) Lengths vary depending on model, SG and rating, and should be verified.
Dis between 7.8 in. (195 mm) to 15 in. (383 mm)
Others - spring operated
(2)
Dis 19.7 in. (500 mm)