Emerson Rosemount 3308, Reference Manual

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Reference Manual
00809-XXXX-4811, Rev AA
February 2012
Rosemount 3308
A-10
PRELIMINARY
Weight Flange: depends on flange size
Coaxial probe: 0.67 lb/ft. (1 kg/m)
Rigid Single Lead probe (0.3 in./8 mm): 0.27 lb/ft. (0.4 kg/m)
Rigid Single Lead probe (0.5 in./13 mm): 0.71 lb/ft. (1.06 kg/m)
Rigid Twin Lead probe: 0.40 lb/ft. (0.6 kg/m)
Flexible Single Lead probe: 0.05 lb/ft. (0.07 kg/m)
Flexible Twin Lead probe: 0.09 lb/ft. (0.14 kg/m)
End weight: 0.88 lb (0.40 kg) for single probes, 1.3 lb (0.60 kg) for twin probes
Chamber / Pipe Installations
Rosemount 9901 Chamber Rosemount 9901 allows external mounting of process level
instrumentation. It supports a variety of process
connections, and optional drain and vent connections. The
Rosemount 9901 chamber is designed to the ASME B31.3
standard, and is Pressure Equipment Directive (PED)
compliant. Use option code XC to order together with the
3308 transmitter.
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 di19 in. (48 cm)
Side-and-Bottom dimension:
Probe length=Centre-to-Centre di4 in. (10 cm)
Use a centering disc the same diameter as the
chamber if the probe length >3.3 ft. (1 m). See “Probe Type
in Chamber Considerations” on page A-11 and “Centering
Discs” on page A-11 for which probe and 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 transmitter is the perfect replacement
in an existing displacer chamber.
Proprietary flanges are offered, enabling use of existing
chambers to make installation easy.
Considerations when changing to the
Rosemount 3308 transmitter:
The Rosemount 3308 transmitter 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 A-13 to identify the proprietary flanges.
See “Probe Type in Chamber Considerations” on
page A-11 and “Centering Discs” on page A-11 for which
probe and disc to use. See Table A-8 on page A-12 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)
Side-and-Side
dimension Side-and-Bottom
dimension
Cen
ter to
Cen
ter
Ce
n
te
r t
o
Ce
n
ter
Replace
chamber
flange
Displacer
Length
Probe
Length