Contrec 515 Series with GN01 application measures the volume, mass and gross heat content of natural gas. The instrument uses a frequency volume flow input and analogue temperature and pressure sensor inputs.
The instrument is compatible with a wide range of flowmeter frequency outputs. Millivolt signals, reed switches, Namur proximity switches or pulse trains can be selected via its smart front-panel programming.
The AGA-8 Detail Characterization Method is used to obtain accurate values of density and compressibility factors for the flow calculations.
The gas density and compressibility factor calculations are based on the AGA-8 equations. The calculations are valid for the region:
-130°C < t < 400°C P < 280MPa
-200°F < t < 760°F P < 40000psia
Mflow = volumeflow•ρflow
corrected flow = Mflow/ρ ref
Heat flow = Mflow•Hm
Mflow = mass flow
ρflow = density at flow conditions
ρ ref= density at reference conditions
Hm= mass gross heating value