Level measurement

106 Continuous level measurement in bulk solids

1. Overview of the measuring principles

A

Radar

Guided radar

FMR66B

FMR67B

FMP56

FMR67B

FMR20

FMP57

Process temperature* Process pressure

–40 to +450°C/ –40 to +842°F –1 to +16bar/ –14.5 to +232psi

–40 to +150°C/ –40 to +302°F –1 to +16bar/ –14.5 to +232psi

Measuring range

0.3 to 125m/1 to 410ft

0.2 to 45m/0.7 to 148ft

Instrument accuracy Surfaces of bulk solids affect accuracy Function may be affected by

• Up to 2m/78": ±20mm/0.8" • From 2m/78": ±3mm/0.12"

• •

• Strong build-up formation • Surface of bulk solids (grain size/angled surface) •Conductive build-up on the antenna •Strong fluidization •Baffles causing interfering reflections • • Baffles in the beam cone • Filling curtain in the beam cone • Angled surface/funnel with a reflecting, smooth surface

• Build-up formation • Baffles in the immediate vicinity of the probe •Strong fluidization

Application limits

• • Coarse-grained (> 20mm/0.8") and abrasive media • Extreme tensile forces • Measurement in the filling curtain

* At the process connection