Astar HT-3300 Especificaciones descargar pdf (Pagina 93)

Reference Manual

00809-0100-4811, Rev DA

Section 4: Basic Configuration/Start-Up

January 2015

Basic Configuration/Start-Up

Table 4-3. Measurement Mode

Interface immersed probe is used for applications where the probe is fully immersed in liquid. In

this mode the transmitter ignores the upper product level. See Interface measurements with

fully immersed probes on page 99 for more information.

Note

Use interface immersed Probe only for applications where interface is measured for a fully

immersed probe.

Dielectrics

In some applications there is heavy vapor above the product surface having a significant

influence on the level measurement. In such cases, the vapor dielectric can be entered to

compensate for this effect.

The default value is equal to 1, which corresponds to the dielectric constant of vacuum.

Normally, this value does not need to be changed since the effect on measurement

performance is very small for most vapors.

For interface measurements, the dielectric constant of the upper product is essential for

calculating interface level and the upper product thickness. By default, the upper product

dielectric parameter is about 2.

If the dielectric constant of the lower product is significantly smaller than the dielectric constant

of water, you may need to make special adjustments. See section Service and Troubleshooting

for further information.

The dielectric constant of the product is used for setting the appropriate signal amplitude

thresholds, see section Service and Troubleshooting for more information on amplitude

threshold settings. Normally, this parameter does not need to be changed for level

measurements. However, for some products, measurement performance can be optimized by

setting the proper product dielectric constant.

RCT contains tools to estimate the dielectric constant of the current product:

 The dielectric chart lists the dielectric constant of a large number of products. Use one

of the following methods to view the dielectric chart:

- Select the View > Dielectric > Dielectric Chart menu option.

- Select the Dielectric Chart icon in the project bar Advanced section.

 The dielectric calculator allows you to calculate the dielectric constant of the upper

product based on the following input:

- actual upper product thickness,

- the dielectric constant value stored in the transmitter, and

- the upper product thickness presented by the transmitter.

Model Measurement mode

3301 Level

(1)

, interface immersed probe

(1) Default setting.

3302 Level, level and interface

(1)

, interface immersed probe

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 223 224

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