NGA Settings

In this pane you can set the NGA Method up - choose norm and edit its specific parameters.

Chromatogram window - NGA Results - NGA Settings

NGA Method ①

Currently opened NGA Method. All settings in the NGA Method are saved in the *.nga file and it's independent on the Method opened on the Instrument. Last opened NGA Method used in the Chromatogram window is saved in the project file (for more details see also chapter Project).

New

Creates new NGA Method with default settings.

Open

Displays the Open NGA Method dialog where you can open one you want to use.

Save

Saves settings of the current NGA Method.

Save As…

Opens the Save As dialog for saving the NGA Method into new file.

Link Table ②

Compound Names for NGA Results are retrieved from the Calibration Table, it doesn't matter whether the Calibration is saved in the Calibration File or is saved in the Chromatogram. How to set the Calibration up you can find in the chapter "Calibration". In the Calibration, it is also necessary to set the detection of the peak in one signal only; otherwise you will see warnings in the NGA Results.

In such situations when Compound Names in norms have different names than the same ones you have saved in your calibrations you can use Link Table for linking those Compound Names and ensure that all compounds are included in selected norm's calculations. For more details see also chapter Link Table.

Edit Link Table…

Opens the Link Table dialog, where you can edit links between Compound Names in the calibrations and norms.

Choose a Norm ③

Select the norm you want to use for your calculations. Each norm has specific list of parameters that can be changed:

 

  • ISO 6976-95

Source Amount

Determines whether the Amount is in mole fractions or in volume fractions. Volume fractions are converted to mole fractions if selected.

Calorific Value Calculation Basis

Determines the units in which to calculate the Superior and Inferior Calorific Values.

Temperatures

Selects the combustion and metering temperatures.

Ideal / Real Gas

Determines whether the calculations are for Ideal or Real Gas. For the Real gas, the Compression Factor is added to the results.

Ideal Heating Type

Determines whether to include a mole fraction of water or not. If water is included in calculations, it is also added to the NGA Amounts.

 

  • ASTM D 3588-98 and GPA 2172-09

Ideal Heating Type

Determines whether to calculate Gross Heating Value or Net Heating Value. For gross calculations, the water condenses to liquid, and, for net calculations, the water remains in the vapor state.

Calorific Value Calculation Basis

Determines the units in which to calculate the Heating Value.

Gas Analysis on

Determines whether to include a mole fraction of water or not. If water is included in calculations, it is also added to the NGA Amounts (but not for GPA 2172-09).

 

  • LPG ASTM D 2598-02 / 2421-02

Original Basis

Determines the source Amount type. It can be Liquid, Mole, Gas, or Weight type. Other types are converted to Liquid type.

 

  • LPG ISO 8973-97 / EN589-04

Original Basis

Determines the source Amount type. Both Molar and Mass fractions are required for calculations (one is converted into another). If Volume fractions are selected, only the Octane Number can be calculated.

Temperature of Liquid

The approximate temperature of liquid.