Instruction Manual
Model NGA2000 HFID
introduced through the sample inlet at the rear of the module.
Zero Gas - Analysis is affected by the background gas of the sample. Therefore, it is recommended to use zero gas with as close to the background composition of the sample as possible. Normally less than 0.5 THC as CH4 is sufficient.
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.
h.Sample Gas Specification
Sample gas should be nonflammable (be- low 100% of the sample's LEL). For high sensitivity applications requiring background gas compensation, contact the factory.
i.Flow Rate Specification
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.
j.Pressure/Filtration Specification
Sample Pressure at the SAMPLE inlet should be within the range of 345 to 620
Burner Fuel Pressure should be: 3101 to 3450
regulator, 1723
Burner Air Pressure should be : 1725 to 3450
Regulated Air Pressure should be 689 to 1725
Purge Air Pressure should be 689 to 1380
Nominal Internal 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
Noncompliance with these specifica- tions, particularly those concerning purge air, could cause
Note
The sample gas and regulated air should be filtered for particulates down to 2 microns to prevent the plugging of pneumatic components.
k.Leak Test
The analyzer module is completely leak tested at the factory. The user is re- sponsible for testing for leakage at the inlet and outlet fittings on the rear panel. The user is also responsible for internal leak testing periodically and if any inter- nal pneumatic components are adjusted or replaced (with a test procedure cho- sen by the user).
Installation | Rosemount Analytical Inc. A Division of Emerson Process Management |