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3 Device-specific Menus Volume 6
Parameters Input Description
Time Constant a Here you define the time constant. The time constant smoothes the out-
put signal. Statistical fluctuations, as well as level fluctuations due to the
process, e.g. by agitators, can be smoothed. The measured data supplied
by the detector is averaged with the time constant. A time constant of less
than 20 seconds is required only in rare cases. The current output is
refreshed every 0.25 s.
The illustration below shows the reaction of the output signal of the
Uni-Probe in case of erratic filling of the tank (input change) from 0 to
100%.
1 x T = single measurement time – standard: 20 s
3 x T = virtually corresponds to the end value
The time constant corresponds in its function to an RC element.
Input change
Output signal Uni-Probe
100%
64%
0%
Signal height
1τ
2τ
3τ
t
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