Heat vale of the mixture can be displayed in one of the following units -
KJ/m3, MJ/m3, GJ/m3, BTU/ft3, BTU/in3, KCal/m3
The thermal power can be displayed in one of the following units -
KJ/hr, MJ/hr, GJ/hr, BTU/hr, KCal/hr, KW and MW.
Corresponding units for energy display are - KJ, MJ, GJ, BTU, KCal, KWh and MWh.
The gas components supported are
l
Methane
l
Nitrogen
l
Carbon Dioxide
l
Ethane
l
Propane
l
Water
l
Hydrogen Sulfide
l
Hydrogen
l
Carbon Monoxide
l
Oxygen
l
i-Butane
l
n-Butane
l
i-Pentane
l
n-Pentane
l
n-Hexane
l
n-Heptane
l
n-Octane
l
n-Nonane
l
n-Decane
l
Helium
l
Argon
4. Net Heat Meter
VFM-5090(I) supports net thermal power and net energy calculations for saturated steam and water.
Thermal power is calculated on line from mass flow and specific enthalpy both at the inlet of the process
and at the outlet. The difference between these two values is the net thermal power. The net thermal
energy is calculated by time integrating (totalizing) the net thermal power. The mass flow is measured
by the VFM along with the temperature at that point. The temperature at the exit of the process is also
measured and transmitted (4 to 20 mA) to the VFM through an additional junction box. The mass flow
rate at the inlet and outlet of the process is assumed to be the same.
Net or external thermal power can be displayed in any one of the following units.
KJ/hr, MJ/hr, GJ/hr, BTU/hr, KCAL/hr, KW, MW.
Net thermal energy units may be displayed in one of the following units.
KJ, MJ, GJ, BTU, KCAL, KWH, MWH.
For external temperature sensing, 2 wire RTD transmitter can be used. This should have current output
4 to 20 mA.& Accuracy better than +/- 0.25% of full scale .
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