Reference Manual
00809-XXXX-4811, Rev AA
February 2012
Rosemount 3308
2-12
PRELIMINARY
Transition Zones
The measuring range depends on probe type and properties of the product.
The
Upper Transition Zone
is the minimum measurement distance between
the upper reference point and the product surface. The Upper Transition Zone
varies between 4 - 20 in. (0.1 and 0.5 m) depending on probe type and
product.
At the end of the probe the measuring range is reduced by the
Lower
Transition Zone
. The
Lower Transition Zone
also varies depending on
probe type and product.
Figure 2-5 illustrates how the measuring range is related to the Transition
Zones:
Figure 2-5. Transition Zones
NOTE
The measurement accuracy is reduced in the Transition Zones. It may even
be impossible to make any measurements at all in those regions. Therefore,
the alarm limit points should be configured outside the Transition Zones.
4mA
20mA
Upper Transition Zone
Lower Transition Zone
Ran
g
e 0 -
100 %
Maximum Measuring
Range
Upper Reference Point
Table 2-2. Transition Zones for different probe types
Dielectric
Constant
Coaxial Probe
Flexible Twin
Lead Probe
Rigid Single
Lead Probe
Flexible Single
Lead Probe
Upper
Transition Zone
2
TO BE ADDED
80
Lower
Transition Zone
2
80
Summary of Contents for Rosemount 3308
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