Specifications

Heated Flame Ionization Detector Analyzer Module
Rosemount Analytical NGA 2000
748414-A
August 1999
9
INSTALLATION
2
Span Gas - Span gas consists of a specified concentration of methane or other
hydrocarbon in a background gas such as nitrogen. Analysis is affected by the background
gas of the sample. Therefore, span gas containing the same background gas as the sample
is recommended. Then, the background effect is canceled out.
Sample Gas
Sample gas should be nonflammable (below 100% of the sample's LEL). For high
sensitivity applications requiring background gas compensation, contact the factory.
Flow Rate
Required sample flow rate is 1.0 L/min. to 2.5 L/min. for a supply pressure between 5 and 9
psig. Flow rate for purge gas should be 16 to 18 L/min. Flow rate for regulated air should
be 2 to 4 L/min.
Pressure/Filtration
Sample Pressure at the SAMPLE inlet should be within the range of 345 to 620 hPa-gauge
(5 to 9 psig, 7.0 psig nominal), and internally, should be between 206.7 and 275.6 hPa-
gauge (3.0 and 4.0 psig).
Burner Fuel Pressure should be: 3101 to 3450 hPa-gauge (45 to 50 psig) for cylinder
regulator, 1723 hPa-gauge (25 psig) nominal for internal pressure.
Burner Air Pressure should be : 1725 to 3450 hPa-gauge (25 to 50 psig) for cylinder
regulator, 1035 hPa-gauge (15 psig) nominal for internal pressure.
Regulated Air Pressure should be 689 to 1725 hPa-gauge (10 to 25 psig) for cylinder
regulator.
Purge Air Pressure should be 689 to 1380 hPa-gauge (10 to 20 psig).
Nominal Interal Case Pressure is about 0.5 to 1.0 inch of water, and the pressure relief
valve is set at 1/3 psig (nominal).
CAUTION: OVER PRESSURE DAMAGE
Noncompliance with these specifications, particularly those concerning purge
air, could cause over-pressure damage to the module.
NOTE
The sample gas and regulated air should be filtered for particulates down to 2
microns to prevent the plugging of pneumatic components.