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Volume flow accuracy
8.5.2 For gases
SITRANS FCT020
Order code
Order code
position 13
position -Z
9
SITRANS FCT040
Order code
Order code
position 13
position -Z
1)
9
1)
9
1)
Notice: In case of a spare sensor combined with a transmitter in use, the original
accuracy specification may be affected. For calibration services, please contact Siemens
Service department.
8.6 Volume flow accuracy
8.6.1 For liquids
The following formula can be used to calculate the accuracy of liquid volume flow:
D
D
V
Δρ
D
ρ
8.6.2 For gases
Accuracy of standard volume flow for gas with a fixed reference density equals the
maximum deviation D of the mass flow.
D
The specified accuracy is then only valid for reference gas density. Gas
composition changes can have different reference density leading to accuracy
deviation.
8.7 Accuracy of temperature
Accuracy of temperature depends on the sensor temperature range selected (see
Process fluid temperature range [} 39]) and can be calculated as follows:
Formula for
ΔT = 0.5 °C + 0.005
specified
temperature range
ΔT
Standard and
Medium
T
pro
7 M E 4 4 x
-
7
5 6
Maximum deviation D
N1A
Maximum deviation D
N2A
N3A
2
∆ρ
(
)
2
= D
+
×
100%
ρ
V
Maximum deviation of volume flow in %
Maximum deviation of density in kg/l
Maximum deviation of mass flow in %
Density in kg/l
= D
V
×
│T
pro
Maximum deviation of temperature
Process fluid temperature in °C measured by SITRANS FC
-
8 9 10 11
12
13 14 15 16
for mass flow
flat
in %
0.75
for mass flow
flat
in %
0.5
0.35
- 20 °C│
A5E52748375-AA, 2023/09
FC6x0
Accuracy
-
Z
33 / 194
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