Process Conditions; Process Pressure Effect; Process Fluid Temperature Effect - Siemens SITRANS FC620 Operating Instructions Manual

FC6x0
Accuracy

8.10 Process conditions

8.10.1 Process pressure effect

Process pressure effect is defined as the change in sensor flow and density deviation due
to process pressure change away from 1barg reference condition. This effect can be
corrected by dynamic pressure input or a fixed process pressure.
Tab. 2: Process pressure effect, wetted parts stainless steel 1.4404/ 316L and Ni alloy C-22/
2.4602
Meter size
FCS600 DN2
FCS600 DN4
FCS600
DN15
FCS600
DN25
FCS600
DN40
FCS600
DN65

8.10.2 Process fluid temperature effect

For mass flow and density measurement, process fluid temperature effect is defined as
the change in sensor flow and density accuracy due to process fluid temperature change
away from 20°C reference condition. For temperature ranges, see Process fluid
temperature range [} 39].
Temperature effect on Zero
Temperature effect on Zero of mass flow can be corrected by zeroing at the process fluid
temperature.
Temperature effect on mass flow
The process fluid temperature is measured and the temperature effect compensated.
However due to uncertainties in the compensation coefficients and in the temperature
measurement an uncertainty of this compensation is left. The typical rest error of
SITRANS FC temperature effect on mass flow is:
Tab. 3: All models
Temperature range
Standard,
Medium
High
Low
The temperature used for calculation of the uncertainty is the difference between process
fluid temperature and the temperature 20 °C reference condition.
36 / 194
Material
in % of rate
per bar
1.4404/316L
and -0.0001
C-22/2.4602
1.4404/316L
and -0.0001
C-22/2.4602
1.4404/316L -0.0005
C-22/2.4602 -0.0005
1.4404/316L -0.0024
C-22/2.4602 -0.0023
1.4404/316L -0.0034
C-22/2.4602 -0.0035
1.4404/316L -0.0084
C-22/2.4602 -0.0074
Uncertainty of flow
±0.0011 % of rate / °C (±0.0006 % of rate / °F)
A5E52748375-AA, 2023/09
Deviation of Flow
in % of rate
per psi
-0.00001
-0.00126
-0.00003
-0.00003
-0.00017
-0.00016
-0.00023
-0.00024
-0.00058
-0.00051
Process conditions
Deviation of Density
in g/l in g/l
per bar per psi
0.007 0.0014
0.02 -0.0023
-0.066 -0.0046
-0.076 -0.0052
-0.193 -0.0133
-0.192 -0.0132
-0.378 -0.0261
-0.381 -0.0263
-0.377 -0.0260
-0.350 -0.0241