The Contrec 515 GN11 is designed to accurately measure the volume, mass, and total heat content of natural gas. This advanced instrument utilizes a frequency volume flow input along with analog temperature and pressure sensor inputs for precise measurements.
This device works seamlessly with various flowmeter frequency outputs. Users can choose from millivolt signals, reed switches, Namur proximity switches, or pulse trains through its intuitive front-panel programming.
To ensure accurate flow calculations, the Contrec 515 GN11 employs the SGERG calculation method (AGA-8 Detail Characterization Method) to determine the density and compressibility factors of the gas.
CALCULATIONS
The calculations for gas density and compressibility factors are based on the SGERG (AGA-8 Gross) equations, which are applicable within the following conditions:
-8.0°C < t < 62.0°C and P < 12MPa
17°F < t < 143.0°F and P < 1740psia
FORMULAS
Mflow = volume flow • ρflow
Corrected flow = Mflow / ρ ref
Heat flow = Mflow • Hm
Where:
Mflow = mass flow
ρflow = density at flow conditions
ρ ref = density at reference conditions
Hm = mass gross heating value
