Troubleshooting guide

116
Reference Manual
00809-0100-4308, Rev BA
Appendix A: Reference Data
December 2014
Reference Data
The probe length to use for a Rosemount 9901 chamber can be calculated with this formula:
Side-and-side dimension:
Probe length=Centre-to-centre dimension + 19 in. (48 cm)
Side-and-bottom dimension:
Probe length=Centre-to-centre dimension + 4 in. (10 cm)
Use a centering disc the same diameter as the chamber if the probe length >3.3 ft. (1 m). See
“Centering discs” on page 118 for which disc to use.
For additional information, see the Rosemount 9901 Chamber for Process Level Instrumentation
Product Data Sheet (document number 00813-0100-4601).
Existing chamber
A Rosemount 3308 Series Transmitter is the perfect replacement in an existing displacer
chamber. Proprietary flanges are offered, enabling use of existing chambers to make installation
easy.
Figure A-11. Existing Displacer Chamber
Considerations when changing to 3308 Series:
 The 3308 Series flange choice and probe length must be correctly matched to the
chamber. Both standard ANSI and EN (DIN), as well as proprietary chamber flanges, are
available. See “Proprietary Flanges” on page 137 to identify the proprietary flanges.
 See “Centering discs” on page 118 for which disc to use.
 See Table A-6 on page 117 for guidelines on the required probe length.
For additional information, see the Replacing Displacers with Guided Wave Radar Technical Note
(document number 00840-2200-4811).
Replace chamber flange
Displacer Length
Probe Length