GB
13
1.7 Accuracy of measurement and flow
In the factory the meter is calibrated for a flow rate of 40 l/min. Other flow rates affect the measurement accuracy
of the flow meter (see diagram 3). The flow rate may be determined via the SPEED key
11
during the filling
process.
For adjusting the measuring result to the determined flow rate, the recent correction factor must be called in from
the main memory (see chapter C 3.3.3). The recent correction factor then is set off against the volume out of
diagram 3 related to the flow rate. Then the new correction factor is entered (see chapter C 3.3.2).
1.8 Optimization of measurement accuracy by calibration
When using a flow meter as an automatic batch meter (frequent handling of the same volume), the meter should
be calibrated to the operating point. By comparative measurement, the displayed volume is coordinated to the
actual volume (see chapter C 3.3.1). For this operating point, the measurement accuracy is 1 digit (corresponding
to ± 0.1 litres, ± 0.01 US-G, ± 0.01 IMP-G).
Example for type ST, SL, LM, UN
Q
= 20 l/min
Ü
K
rel
= 0.01
K
1
= 1.028
K
2
= K
1
+ K
rel
K
2
= 1.028 + 0.01
K
2
= 1.038
Example for type VA I:
Q
= 20 l/min
Ü
K
rel
= 0.03
K
1
= 3.37
K
2
= K
1
+ K
rel
K
2
= 1.028 + 0.03
K
2
= 3.4
Q:
Flow rate
K
rel
:
Relative correction factor out of diagram 3
K
1
:
Recent correction factor out of main memory
K
2
:
New correction factor
Diagram 3
Correction factor depending on flow rate
B. Basic flow meter
Summary of Contents for 0212-100
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