Emerson Process Management rosemount 3300 series 352&66 +$5$&75,67,&6, Rdwlqj Ulgjlqj RDP, 9DSRU

Rosemount 3300 Series

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The Rosemount 3300 Series has a high sensitivity due to its advanced signal processing and high signal to noise ratio, which makes it able to handle various disturbances. However, the following circumstances should be considered before mounting the transmitter.

Coating on the probe should be avoided since the sensitivity of the transmitter may be decreased leading to measurement errors. In viscous or sticky applications, periodic cleaning may be required.

Heavy coating that results in product bridging across the two probes for twin lead versions, or between the pipe and the inner rod for coaxial probes, will cause erroneous level readings and must be prevented. Single lead probes are preferred in this case.

How well the Rosemount 3300 Series Radar Transmitter measures in foamy applications depends upon the properties of the foam; light and airy or dense and heavy, high or low dielectrics, etc. If the foam is conductive and creamy the transmitter will probably measure the surface of the foam. If the foam is less conductive the microwaves will probably penetrate the foam and measure the liquid surface.

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Table 2-3. Measuring Range

In some applications, as ammonia, there is heavy vapor above the product

The measuring range differs depending on probe type and characteristics of the application. The values given in 7DEOH can be used as a guideline for

surface that will influence the level measurement. The Rosemount 3300 Series Radar(￿￿￿!Transmitter*￿￿￿￿;￿￿(￿can*￿￿￿￿￿be ￿!configured￿￿￿￿￿￿￿￿￿￿4￿￿￿￿!￿￿to compensate￿￿￿￿￿;￿￿￿4￿￿￿￿￿￿!￿￿￿for the influence of vapor.

clean liquids.

19 ft 8 in. (6 m)

9 ft*￿￿￿￿￿￿￿10 in. (3 m)$￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿￿*￿￿￿￿￿￿￿*￿￿￿￿￿￿￿￿￿￿￿￿￿￿65 ft 7 in. (20 m) 9 ft 10 in. (3 m)

65 ft 7 in. (20 m)

1.6

1.9

2.0 (1.6 up to 10 m)

2.5(2.0 if installed in a metallic bypass or stilling well)

2.8 (2.0 up to 10 m)

The maximum measuring range differs depending on application according to:

•Disturbing objects close to the probe.

•Media with higher dielectric constant (εr) gives better reflection and allows a longer measuring range.

•A calm surface gives better reflection than a turbulent surface. For a turbulent surface the measuring range might be reduced.

•Surface foam and particles in the tank atmosphere are also circumstances that might affect measuring performance.

•Coating/contamination can reduce the measuring range.

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