Emerson Process Management NGA2000 HFID 用户手册

748297-E 
June 2003 

          Description and Specifications 

Rosemount Analytical Inc.    A Division of Emerson Process Management 

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Model NGA2000 HFID

The HFID Analyzer Module is designed with a 
factory-installed continuous dilution purge sys-
tem in accordance with standard ANSI/NFPA 
496 - 1993, Chapter 6. Front-panel LEDs indi-
cate that the burner flame is lit and that the 
purge system is enabled. In addition, fuel gas 
is automatically shut off when a flame-out 
condition occurs or the safety system is dis-
abled. 

The purge system is enabled only if there is 
proper purge gas flow in, purge gas pressure, 
and internal case pressure, and after five 
times the case volume has been exchanged. 

All tubing ahead of the burner is rigid metallic 
tubing assembled with ferrule/nut type com-
pression fittings. However, should an internal 
fuel leak occur, a worst-case leak would be 

dissipated below 25% of the LEL of hydrogen 
through the combination of an inlet fuel flow 
restrictor and purge gas flow. 

This module is designed to use 40% H

2

/60% 

He fuel at a maximum inlet pressure of 3446 
hPa-gauge (50 psig).  

A standard HFID Analyzer Module is only 
equipped to analyze a non-flammable sample, 
below 100% of the LEL..