Guided wave radar level transmitters
12 Jun 2002
Emerson Process Management has introduced a series of guided wave radar level transmitters.
These transmitters, dubbed the Rosemount 3300 series, offer multivariable output to provide both top level and interface level variables from a single two- wire device.
The 3300 series transmitters make use of time domain reflectometry. In operation, the device sends a microwave pulse down a probe and reflected signals are received. The reflected signals are then used to determine the distance to the top level and can also be used to determine the distance to an interface level as well.
This technology provides an inherently stronger signal-to-noise ratio than free radiating radar gauges. It can also be used in a vessel with a tight geometry or obstructions that prevent the use of other top-down level measurement technologies.
Guided wave radar can also cope with probe coating and material build up better than other contacting level technologies.
