Troubleshooting guide

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)
Displacer + 9 in. (229 mm)
Masoneilan (Torque tube operated),
proprietary flange
Displacer + 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.
Displacer + 8 in. (203 mm)
Magnetrol (spring operated)
(3)
(3) Lengths vary depending on model, SG and rating, and should be verified.
Displacer + between 7.8 in. (195 mm) to 15 in. (383 mm)
Others - spring operated
(2)
Displacer + 19.7 in. (500 mm)