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FC1x0
Accuracy
8.9.2 Density calibration
Density calibration is performed for maximum deviation of 0.5 g/l (0.03 lb/ft³), (order code
pos. 13: 1).
Density calibration includes:
▪ Determination of calibration constants for fluid densities at 0.7 kg/l (44 lb/ft³), 1 kg/l
▪ Check of results for fluid densities at 0.7 kg/l (44 lb/ft³), 1 kg/l (62 lb/ft³) and 1.65 kg/l
▪ Special design (probe type) of the temperature sensor
▪ Creation of density calibration certificate
8.9.3 Calibration for gases
Same calibration conditions described in Mass flow calibration and density adjustment
[}
Specifications are determined based on evaluation at accredited ISO/IEC17025
calibration at following conditions:
Terms
Fluid
Fluid temperature
Process pressure
Different gases can be considered by entering characteristic gas sound velocity and
related temperature coefficient
1)
Only with SITRANS FC HART firmware rev.4 or later. For details please contact your
local Siemens sales organization.
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
Meter size
FCS100 DN1
FCS100 DN2
FCS100 DN4
FCS100 DN6
FCS100 DN8
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
34 / 168
(62 lb/ft³) and 1.65 kg/l (103 lb/ft³) at 20 °C (68 °F) fluid temperature
(103 lb/ft³) at 20 °C (68 °F) fluid temperature
33] apply for gas measurement according to AGA11 water calibration transferability
Deviation of Flow
in % of rate
per bar
none
none
none
-0.0011
-0.0010
[}
36].
A5E52595189-AA, 2023/09
Reference conditions
Natural Gas
20 °C (68 °F)
16 barg (232 psig) and 50 barg (725 psig)
1)
.
in % of rate
in g/l
per psi
per bar
none
-0.016
none
-0.016
none
-0.017
-0.00008
-0.033
-0.00007
-0.260
Process conditions
Deviation of Density
in g/l
per psi
-0.0011
-0.0011
-0.0011
-0.0023
-0.0179
1)
.
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