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FLOWSIC30 · Operating Instructions · 8020999/173B/V1-4/2020-02 · © SICK Engineering GmbH
Product description
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2.2.5
Volume conversion (option)
As an option, FLOWSIC30 can be ordered with electronic volume conversion.
The optional Electronic Volume Converter (EVC) provides the capability to convert the
measured values in actual condition (a. c.) to standard condition (s. c.). Various standard
conditions can be defined.
Table 1
Measured values
The gas compressibility calculation is made acc. to AGA 8 Gross method 1 or 2. It requires
input of certain process values such as gas pressure and temperature. Settings can be
made in the FLOWgate
TM
operating software or via HART
®
protocol.
Prerequisites for volume conversion
● Actual process pressure is fed into FLOWSIC30 by one of the methods below:
– The process pressure is set to a fix value in FLOWSIC30.
– The process pressure is read in from an external HART
®
pressure sensor connected
to the HART
®
bus. The p sensor is then loop powered.
– The process pressure is read in from an internal pressure sensor.
● The p sensor and the FLOWSIC30 are configured as follows:
– The p sensor and the FLOWSIC30 are in multidrop mode.
– The p sensor is in burst mode or must be polled periodically by HART
®
master.
● The p sensor has been fully configured in FLOWSIC30.
Table 2
AGA8, ranges of applicability
In actual condition
In standard condition
Gas volume a. c.
Gas volume s. c.
Error volume a. c.
Error volume s. c.
Volumetric flow a. c.
Volumetric flow s. c.
Quantity
Gross calculation
Relative Density (Gr)
0.56 to 0.87
Gross Heating Value
477 to 1150 Btu/scf (16.8 - 40.5 MJ/m³)
Mol Percent Methane
45.0 to 100.0
Mol Percent Nitrogen
0.0 to 50.0
Mol Percent Carbon Dioxide
0.0 to 30.0
Mol Percent Ethane
0.0 to 10.0
Mol Percent Propane
0.0 to 4.0
Mol Percent Butanes
0.0 to 1.0
Mol Percent Pentanes
0.0 to 0.3
Mol Percent Hexanes Plus
0.0 to 0.2
Mol Percent Helium
0.0 to 0.2
Mol Percent Hydrogen
Assumed 0.0
Mol Percent Carbon Monoxide
Assumed 0.0
MolPercent
Argon
Assumed 0.0
Mol
Percent Oxygen
Assumed 0.0
Mol Percent Water
0.0 to 0.05
Mol
Percent Hydrogen
Sulfide
0.0 to 0.02
Flowing
Pressure
1200 psia (8.3 MPa)
Flowing Temperature
32 to 130 Deg F (0 to 55 Deg C)
