SU2020 SU2021 SU2621 SU8020 SU8021 SU8621 SU9020 SU9021
Ultrasonic flow meter
32
10.3.5 Frequency signal
The unit provides a frequency signal proportional to the process value.
The frequency signal is scalable:
•
[FrPx] defines the frequency signal in Hz that is provided when the upper measured value (MEW or
FEPx) is reached.
The measuring range is scalable:
•
[FSPx] defines the lower measured value from which a frequency signal is provided.
– FSPx is only available for temperature measurement.
•
[FEPx] defines the upper measured value at which the output signal has the frequency set under
FrPx.
Minimum distance between FSPx and FEPx = 20 % of the final value of the measuring range.
If the measured value is outside the measuring range or in the event of an internal error, the frequency
signal indicated in the following figure is provided.
For measured values outside the display range or in case of a fault, messages are displayed (UL, OL,
Err).
Frequency signal flow:
FOU = OFF 0
2
1
3
4
5
FOU = ON 130
120
100
Err
= FrPx
MAW
FEPx
MEW
OL
100 200
[% MEW]
[% FrPx]
Fig. 22: Output characteristics frequency output, flow
1:
Frequency signal
MAW:
Initial value of the measuring range
2:
Flow
MEW:
Final value of the measuring range
3:
Display range
FEPx:
Frequency end point
4:
Measuring range
FrPx:
Frequency signal (Hz) for upper measured value
5:
Scaled measuring range
OL:
Above the display range
Err:
Error
