Chambers with smaller diameter can lead to problems with build-up. Chambers larger
than 6" (150mm) can be used, but offer little advantage for radar measurement.
The probe must extend the full length of the chamber and not contact the bottom of the
chamber, or make contact with the chamber wall.
Clearance from the bottom of the chamber is recommended to be 1" (25mm). Probe
selection is dependent on length.
For lengths less than 20′ 8″ (6.3m): Rod probe is recommended.
For lengths more than 20′ 8″ (6.3m): Wire probe with weight and centering disk is
recommended.
A centering disc is recommended for rigid probes over 1-m length to prevent excessive
movement caused by strong currents inside the pipe.
For saturated steam applications refer to Table 2-1.
Mounting on a non-metallic container
To install a single lead probe into a non-metallic (plastic) vessel, the probe must be
mounted with a metal flange (>2″/DN50) or if a threaded process connection is in use,
the probe must be screwed into a metal sheet (diameter > 8″/200mm).
Figure 3-37: Mounting on a non-metallic vessel
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