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Reference Manual

00809-0100-4811, Rev DA

Section 2: Transmitter Overview

January 2015

Transmitter Overview

The maximum allowable upper product thickness/measuring range is primarily determined by

the dielectric constants of the two liquids.

Target applications include interfaces between oil/oil-like and water/water-like liquids. For such

applications, the upper product dielectric constant is low (< 3) and the lower product dielectric

constant is high (> 20). The maximum measuring range is only limited by the length of the

coaxial and rigid twin lead probes.

For the flexible twin lead probe, the reduction of maximum measuring range (65 ft/20 m), can

be gained from Figure 2-4 on page 13.

However, characteristics varies widely between different applications. For other product

combinations, consult factory.

Figure 2-4. Reduction of Maximum Measuring Range for Flexible Twin Lead Probes

Emulsion layers

Sometimes there is an emulsion layer (mix of the products) between the two products which,

depending on its characteristics, will affect interface measurements.

Please consult factory for guidelines on how to handle emulsion layers.

2.5 Vessel characteristics

2.5.1 Heating coils, agitators

The Rosemount 3300 Series Radar Transmitter is relatively insensitive to objects in the tank

since the radar signal is transmitted along a probe.

Avoid physical contact between probes and agitators as well as applications with strong fluid

movement unless the probe is anchored. If the probe can move within 1 ft (30 cm) away from

any object, such as an agitator, during operation, then probe tie-down is recommended.

In order to stabilize the probe for side forces, it is possible to hang a weight at the probe end

(flexible probes only) or fix/guide the probe to the tank bottom.

Flexible twin lead probe (ft/m)

Maximum upper product thickness (ft/m)

82.0 (25)

78.7 (24)

75.5 (23)

72.2 (22)

68.9 (21)

65.6 (20)

0 (0) 3.3 (1) 6.6 (2) 9.8 (3) 13.1 (4) 16.4 (5)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 223 224

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Astar HT-3300 Spezifikationen Seite 23