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Reference Manual

00809-0100-4811, Rev DA

Section 4: Basic Configuration/Start-Up

January 2015

Basic Configuration/Start-Up

Reference gauge height

The reference gauge height is the distance from the upper reference point to the bottom of the

tank. The transmitter measures the distance to the product surface and subtracts this value

from the reference gauge height to determine the level.

Probe length

The probe length is the distance between the upper reference point and the end of the probe. If

a weight is used at the end of the probe it should not be included.

For flexible single lead probes anchored with clamps, the probe length should be configured as

the distance between the underside of the flange and the upper clamp (see Using a segmented

probe on page 36).

This parameter is pre-configured at factory. It must be changed if the probe is shortened.

Probe type

The transmitter is designed to optimize measurement performance for each probe type.

This parameter is pre-configured at factory. This value needs to be changed if the probe type is

changed.

Flexible and rigid probes require different radar electronics and cannot be used with the same

transmitter head.

Dielectric constant of upper product

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

good accuracy. See Interface on page 12 for further information on dielectric constants.

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 Interface measurements for

semi-transparent bottom products on page 96 for further information.

For level measurements, the Upper Product Dielectric parameter corresponds to the actual

dielectric constant of the product in the tank. Normally, this parameter does not need to be

changed even if the actual dielectric constant of the product deviates from the Upper Product

Dielectric parameter value. However, for some products, measurement performance can be

optimized by setting the proper product dielectric constant.

Dielectric constant of vapor

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 dielectricity of vacuum. Normally, this

value does not need to be changed since the effect on measurement performance is very small

for most vapors.

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Astar HT-3300 Spezifikationen Seite 73