Product Data Sheet
00813-0100-4811, Rev DA
Catalog 2008 - 2009
Level-13
Rosemount 3300 Series
Mechanical Considerations
Typically the transmitter is top mounted with a
flanged or threaded tank connection, but the probe
can also be installed at an angle of up to 90° from
vertical. It is also possible to turn the transmitter
housing in any direction.
The probe must be hung, fully extended, through the
entire distance where level readings are desired.
To get best possible performance, the following must
be considered before installing the transmitter:
• Inlets should be kept at a distance in order to
avoid product filling on the probe.
• Max. recommended nozzle height is 4 in. (10
cm) + nozzle diameter.
• Avoid physical contact between probes and
agitators as well as applications with strong
fluid movement unless the probe is anchored.
If the probe can move to within 1 ft (30 cm) of
any object during operation then probe
tie-down is recommended.
• In order to stabilize the probe for side forces, it
is possible to fix or guide the probe to the tank
bottom.
• Select probe length according to the required
measuring range. Most of the probes can be
cut in field. However, there are some
restrictions for the standard and HP coaxial
probes: these can be cut up to 2 ft (0.6 m).
Probes shorter than 4.1 ft (1.25 m) can be cut
to the minimum length of 1.3 ft (0.4 m).
The HTHP coaxial probe and the PTFE
covered probes can not be cut in field.
• For optimal single lead probe performance in
non-metallic vessels, the probe must either be
mounted with a 2-in. / DN 50 or larger metallic
flange, or a metal sheet with an 8-in. diameter
(200 mm) or larger must be used (see the
Reference Manual for placement).
If there is a chance the probe comes into contact with
a wall, nozzle or other tank obstruction, the coaxial
probe is the only recommended choice. Minimum
clearance is given in the table below.
For more information on mechanical installation, see
the Reference Manual (document number
00809-0100-4811).
Nozzle Diameter
Nozzle
Height
Clearance to tank wall
Flexible single
lead probe with
chuck. See the
Reference
Manual for more
anchoring
options.
Coaxial Rigid Twin Lead Flexible Twin Lead Rigid Single Lead Flexible Single Lead
Recommended
nozzle diameter
Enough space to fit
the probe
4 in. (10 cm) or more 4 in. (10 cm) or more 6 in. (15 cm) or more 6 in. (15 cm) or more
Min. nozzle
diameter
(1)
Enough space to fit
the probe
2 in. (5 cm) 2 in. (5 cm) 2 in. (5 cm) 2 in. (5 cm)
Min. clearance to
tank wall or
obstruction
(2)
0 in. (0 cm) 4 in. (10 cm) 4 in. (10 cm) 4 in. (10 cm) if
smooth metallic wall.
12 in. (30 cm) if
disturbing objects,
rugged metallic or
concrete/plastic wall.
4 in. (10 cm) if
smooth metallic wall.
12 in. (30 cm) if
disturbing objects,
rugged metallic or
concrete/plastic wall.
Min. pipe / bypass
diameter
1.5 in. (3.8 cm) 2 in. (5 cm)
(3)
Consult factory 2 in. (5 cm)
(4)
Consult factory
(1) Requires special configuration and setting of Upper Null Zone.
(2) Minimum clearance from tank bottom for the coaxial and rigid single probes is 0.2 in. (5 mm).
(3) The centermost lead must be at least 0.6 in. (15 mm) away from the pipe/bypass wall.
(4) The probe must be centered in the pipe/bypass. A centering disc (see “Centering Discs” on page 12 and “Ordering Information” on page 28) can be used to
prevent the probe from contacting the bridle wall.
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