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FC1x0
Accuracy
8 Accuracy
In this chapter, maximum deviations are indicated as absolute values.
All accuracy data are given in ± values.
8.1 Overview
Achievable accuracies for liquids
The value D
mass flow limit Q
If the flow rate is higher than Q
cavitation).
The following values are achieved at calibration conditions when the device is delivered,
see Calibration conditions. For small meter sizes, specifications may not be as accurate,
see Mass flow accuracy
Measured quantity
Mass flow
Volume flow
(water)
Density
Temperature
Achievable accuracies for gases
Measured quantity
Mass flow /
standard
volume flow
Temperature
1)
Based on the measured values of the pulse output. This means that the flow accuracy
and repeatability considers the combined measurement uncertainties including sensor,
electronic and pulse output interface.
2)
Best mass flow accuracy per transmitter type for FCS100 DN6 and FCS100 DN8.
3)
The stated repeatability is included in the accuracy.
8.2 Zero point stability of the mass flow
In case of no flow, the maximum measured flow rate is called Zero point stability. Zero
point values are shown in the table below.
Meter size
FCS100 DN1
28 / 168
specified for accuracy of mass flow applies for flow rates exceeding the
flat
. If the flow rate is less than Q
flat
nom
[}
29].
2)
Accuracy
D
flat
1)
3)
Repeatability
2)
Accuracy
D
V
1)
3)
Repeatability
2)
Accuracy
3)
Repeatability
2)
Accuracy
2)
Accuracy
D
flat
3)
Repeatability
1)
2)
Accuracy
Zero point stability Z
in kg/h (lb/h)
0.003 (0.007)
A5E52595189-AA, 2023/09
, other effects have to be considered.
flat
, other effects might influence the accuracy (e.g.
Accuracy for transmitters
SITRANS FCT020
0.2 % of measured value
0.1 % of measured value
0.45 % of measured value 0.12 % of measured value
0.23 % of measured value 0.06 % of measured value
4 g/l (0.25 lb/ft³)
2 g/l (0.13 lb/ft³)
0.5 °C (0.9 °F)
Accuracy for transmitters
SITRANS FCT020
0.75 % of measured value 0.5 % of measured value
0.6 % of measured value
0.5 °C (0.9 °F)
Overview
SITRANS FCT040
0.1 % of measured value
0.05 % of measured value
0.5 g/l (0.03 lb/ft³)
0.3 g/l (0.02 lb/ft³)
0.5 °C (0.9 °F)
SITRANS FCT040
0.4 % of measured value
0.5 °C (0.9 °F)
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