BKI GO-36 Wartungshandbuch PDF herunterladen (Seite 66)

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BKI 09 ATEX 0003X

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htk4014a0600p_01.doc

5.4.2 GAIN AND VOLTAGE AMPLITUDE

As explained in the measuring principle in the introduction, the level of a product is converted from a return signal (the product reflection) received by the gauge: this

signal has taken a certain amount of time to return to the gauge and it has a certain strength / size measured in milli-volts (dependant on the dielectric constant

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the product).

All pulse signals returning to the gauge electronics block (including flange, obstruction and the product surface reflections) are converted to voltage amplitudes. The

gauge’s microprocessor looks for part of the largest signal that is over a set voltage amplitude, called the “threshold”, and identifies this as the product being

measured. For this signal to be usable by the gauge, the microprocessor will amplify the signal by increasing the gain. Once the signal is within a set “working” range,

the gauge follows this signal. The gauge registers any changes in time for this part of the signal to return to the converter and translate this into a displayed level or

volume.

Gain is a function of voltage amplitude.

This defines the default threshold value when the gauge is searching for the product level.

A strong return signal will be given a low gain (i.e. Gain 0 or a small amplification).

However, if the signal is very weak, then a Gain of 3 (i.e. high signal amplification) is given.

Example of signal amplification:

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