Emerson Process Management 760004-A - Manual (Page 19)

Instruction Manual
760004-A
February 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Description and Specifications 1-5
Model NGA 2000 HFID
c. Gas Requirements
Sample .......................................... Non-flammable, below 100% of LEL
Flow rate ................................ 1.0 to 2.5 L/min.
Supply pressure..................... 345 to 620 hPa-gauge (5 to 9 psig)
Temperature .......................... 110
o C to 230 o C (230 o F to 446 o F), <20 o C variance/24 hours, <10 o C
variance/hr.
Particulates............................ filtered to <2 microns
Dewpoint................................ <15
o C below the setpoint
Regulated Air................................. Instrument air or nitrogen
Flow rate ................................ 2 to 4 L/min.
THC .......................................
≤2 ppm, CH
4
Supply pressure..................... 689 to 1723 hPa-gauge (10 to 25 psig)
Particulates............................ filtered to <2 microns
Purge Air:....................................... Instrument air, nitrogen or other nonflammable gas (refer to
ANSI/NFPA 496 for the requirements for the Protective Gas Sys-
tem)
Flow rate: .............................. 16 to 18 L/min.
Supply pressure:.................... 689 to 1378 hPa-gauge (10 to 20 psig)
Fuel Gas ........................................ Premixed 40% hydrogen and 60% helium
Flow rate ................................ 80 to 100 ml/min
THC .......................................
≤0.5 ppm, CH
4
Supply pressure..................... 3101 to 3446 hPa-gauge (45 to 50 psig)
WARNING
EXPLOSION HAZARD
Do not use pure hydrogen fuel. An explosion resulting in severe personal injury or death could oc-
cur.
Burner Air ...................................... Zero-grade air
Flow rate ................................ 350 to 400 mL/min.
THC .......................................
≤1 ppm, CH
4
Supply pressure..................... 1723 to 3446 hPa-gauge (25 to 50 psig)