Table 2-1: Probe Selection Guide. G=Good, NR=Not Recommended, AD=Application Dependent (consult
factory) (continued)
Rigid single
lead,
segmented
rigid single
lead
Flexible
single lead
Coaxial Large
coaxial
Rigid twin
lead
Flexible
twin lead
Liquid or vapor spray
might touch probe above
surface
NR NR G G NR NR
Disturbing
Electromagnetic
interference in tank
AD AD G G AD AD
Cleanability of probe G G NR AD AD AD
(1) For overall level applications, a changing dielectric has no effect on the measurement. For interface measurements, a
changing dielectric for the top fluid will degrade the accuracy of the interface measurement.
(2) Limited measuring range.
(3) For viscous or sticky applications, it is not recommended to use centering discs mounted along the probe.
2.6 Measuring range
The measuring range depends on probe type, dielectric constant of the product and
installation environment, and is limited by the Blind Zones at the very top and bottom of
the probe. In the Blind Zones, the accuracy exceeds ±1.18 in. (30 mm), and measurements
may not be possible. Measurements close to the Blind Zones will have reduced accuracy.
Figure 2-7 illustrates how the measuring range is related to the Blind Zones and the areas
with reduced accuracy.
Reference Manual Transmitter overview
00809-0100-4530 April 2019
Reference Manual 21
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