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Overview
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
Maximum deviation D is made up of zero point stability Z and accuracy D
accuracy [} 30]. The accuracy achieved at calibration conditions as delivered is
specified below; see Calibration conditions.
Measured quantity
Mass flow
Volume flow
(water)
Density
Temperature
Achievable accuracies for gases
Measured quantity
Mass flow /
standard
volume flow
Temperature
Based on the measured values of the pulse output. This means that the flow accuracy
1)
and repeatability considers the combined measurement uncertainties including sensor,
electronic and pulse output interface.
Best mass flow accuracy per transmitter type.
2)
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
FCS700 DN100
FCS700 DN150
FCS700 DN200
Accuracy
2)
D
0
1)
Repeatability
3)
Accuracy
2)
D
V
1)
Repeatability
3)
Accuracy
2)
Repeatability
3)
Accuracy
2)
Accuracy
2)
D
0
or D
flat
1)
Repeatability
3)
Accuracy
2)
Zero point stability Z
in kg/h (lb/h)
13 (29)
25 (55)
27 (60)
Accuracy for transmitters
SITRANS FCT020
0.2 % of measured value
0.1 % of measured value
0.45 % of measured value 0.22 % of measured value
0.23 % of measured value 0.11 % 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 0.35 % of measured value
0.6 % of measured value
0.5 °C (0.9 °F)
A5E52748387-AA, 2023/09
FC7x0
Accuracy
, see Mass flow
0
SITRANS FCT040
0.1 % of measured value
0.05 % of measured value
2 g/l (0.13 lb/ft³)
1 g/l (0.06 lb/ft³)
0.5 °C (0.9 °F)
SITRANS FCT040
0.28 % of measured value
0.5 °C (0.9 °F)
29 / 180
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