Emerson Process Management rosemount 3300 series manual 6HFWLRQ 7UDQVPLWWHU2YHUYLHZ

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00809-0100-4811, Rev AA October 2002

Rosemount 3300 Series

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7+(25<￿2)￿23(5$7,21 The Rosemount 3300 Series Radar Transmitter is a smart, two-wire continuous level transmitter that is based on Time Domain Reflectometry (TDR) principles. Low power nano-second-pulses are guided along a probe immersed in the process media. When a pulse reaches the surface of the material it is measuring, part of the energy is reflected back to the transmitter, and the time difference between the generated and reflected pulse is converted into a distance from which the total level or interface level is calculated (see below).

The reflectivity of the product is a key parameter for measurement performance. A high dielectric constant of the media gives better reflection and a longer measuring range. A calm surface gives better reflection than a turbulent surface.

Figure 2-1. Measurement

Principle.

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Time

TDR_PRINCIPLES

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