Instruction Manual

748297-E June 2003

Model NGA2000 HFID

1-4 GAS SAFETY FEATURES

The HFID Analyzer Module is designed with a factory-installed continuous dilution purge system in accordance with standard ANSI/NFPA 496 - 1993, Chapter 6. Front-panel LEDs indicate 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 compression 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% H2/60% 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..

WARNING

POSSIBLE EXPLOSION HAZARD

Protection against explosion depends upon a special fuel flow restrictor in the fuel inlet fitting. Do not remove fuel inlet restrictor. Do not use 100% hydrogen fuel. Replace only with a factory supplied fit- ting.

1-2

Description and Specifications

Rosemount Analytical Inc. A Division of Emerson Process Management