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Instruction Manual
748297-E
June 2003
Installation Rosemount Analytical Inc. A Division of Emerson Process Management
2-2
Model NGA2000 HFID
All new external gas tubing (except for
PURGE IN/OUT and SAMPLE BYPASS) is
strongly recommended, preferably pre-
cleaned, stainless steel, gas chromato-
graph-grade tubing. Thoroughly clean be-
fore use (if a hydrocarbon-based cleaning
solvent such as acetone is used, purge tub-
ing with dry nitrogen or helium for several
minutes before using.)
Gas line connections are compression fit-
tings. Do not use pipe thread tape.
Since the oxidation of hydrogen is accom-
panied by the formation of water vapor, the
Exhaust tubing always should be slanted
downward at least 6 degrees from horizon-
tal. Otherwise, water may accumulate in
the line, causing back pressure and
noisy readings, or may back up in the
line and flood the burner. Depending on
the percent of water vapor in the sam-
ple, the sample bypass out connection
may have condensation. Proper drain-
age may be required.
If the sample is toxic or noxious, or is to
be reclaimed, connect the Bypass outlet
to a suitable disposal system. Do not
use any device that may cause back
pressure in the line.
Purge air and burner air should be sup-
plied from separate sources.
Figure 2-1. Back Panel Connections
Danger d'electrocution, d'explosion ou d'emanation de gaz
toxique. Se refere aux details inscrits surla face du module.
PURGE
AIR IN
PURGE
AIR OUT
PRESSURE
RELIEF
VALVE
BURNER
AIR IN
HEATED
SAMPLE IN
VENT TO SAFE AREA
SLOPE DOWNWARD 6!
MINIMUM
FUEL
IN
BURNER
EXHAUST
OUT
REGULATE
D
AIR IN
MAXIMUM
INPUT
PRESSURE
HEATED
SAMPLE
BYPASS OUT
Possible electric shock, explosion or toxic gas hazard. See front of module
A
TTENTION
FUEL: 50 psig(3445 hPa)
BURNER AIR: 50 psig (3445 hPa)
SAMPLE: 8 psig (551 hPa)
PURGE AIR: 20 psig (1378 hPa)
REG AIR: 25 psig (1722 hPa)
ATTENTION
WARNING
WARNING
CHAUD !
!
!
HOT !