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Reference Manual

00809-0100-4811, Rev DA

Section 2: Transmitter Overview

January 2015

Transmitter Overview

2.7.1 Transition zones

The measuring range depends on probe type and properties of the product. The upper

transition zone is the minimum measurement distance between the upper reference point and

the product surface. The upper transition zone varies between 4 - 20 in. (0.1 and 0.5 m)

depending on probe type and product.

At the end of the probe, the measuring range is reduced by the lower transition zone. The lower

transition zone also varies depending on probe type and product.

Figure 2-6 illustrates how the measuring range is related to the transition zones.

Figure 2-6. Transition Zones

For detailed information on transition zones for different probe types, see Table A-4 on

page 128.

Note

Measurement accuracy is reduced in the transition zones. It may even be impossible to make

any measurements at all in those regions. Therefore, the 4-20 mA set points must be configured

outside the transition zones.

4mA

20mA

Upper transition zone

Lower transition zone

Range 0 -100 %

Maximum measuring

range

Upper reference point

Lower reference point

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Astar HT-3300 Spezifikationen Seite 26