BKI16ATEX0018X ♦ htk4014a0600p_03 ♦ 65 / 76
The level signal can be optimized by way of two factors:
Amplification factor
The amplitude of the signals is proportional to the dielectric constant ε
r
of the product. At low amplitudes the signal should be amplified.
The amplification factor is dependent on the dielectric constant ε
r
and on the probe type. The device sets the gain automatically.
Gain Amplification factor
0 1.05
1 2.10
2 4.37
The following factors apply to the set gain:
3 8.93
Level threshold
The level threshold suppresses interference signals so that only the reflections from the product surface (level signal) are shown. The factory setting of the level
threshold is suitable for standard applications.
The threshold will need to be adjusted in the case of very low dielectric constants ε
r
,
multiple interference reflections or unfavourable installation conditions.
The illustrations below show interference signals when the oscilloscope function is used.
These reflections can be due to various causes, e.g. tank internals or multiple reflections within the measuring range.
Even though the interference signals are very weak, the threshold should nevertheless
be set to a value above these signals.
1 Initial pulse
2 Flange reflection
3 Level signal
4 Interference signal
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