Specifications

I
NSTALLATION
748410-A
August 1999
8
Chemiluminescense Detector Analyzer Module
Rosemount Analytical NGA 2000
2
2.4.3 S
PECIFICATIONS
Calibration Gases
Either U.S.P. breathing grade air or nitrogen is recommended for use as zero gas. A mixture
of NO or NO
2
in a background of nitrogen is recommended as span gas. For maximum
accuracy, the concentration of NO in the span gas should be about the same as that in the
expected sample stream.
Ozonator Source Gas
For analyzers with ranges less than 0 to 2,500 ppm, U.S.P. breathing grade air should be
used for generation of the ozone required for the chemiluminescence reaction. For ranges
greater than 0 to 2,500 ppm, breathing grade oxygen is required.
Sample
The sample must be clean and dry before entering the Analyzer Module. Sample should be
filtered for particulates down to two microns, and should have a dew point 5
o
C (13
o
F) below
coldest ambient temperature.
At no time should sample flow exceed 2200 cc/min. Damage to internal
components may occur if this flow level is exceeded.
CAUTION: EXTERNALLY RESTRICT SAMPLE FLOW TO LESS THAN
2200 CC/MIN.
No restrictor is provided in the sample inlet of this module. For those users who
cannot externally limit sample flow, accessory restrictor PN 657300 is available
from Rosemount Analytical.
To obtain this accessory, call 800-441-7245.
Pressure
Between 690 and 1035 hPa-gauge (10 and 15 psig) of ozonator air (or oxygen, if
appropriate) should be present at the rear panel of the module. Bypass sample gas flow
rate should be between 700 and 2000 cc/min. with backpressure regulator pressure (see
Capillary Pressure in Current Measurement Parameters menu, which can be viewed by
selecting the PARMS softkey in Main Menu) adjusted to 344 hPa (5 psig).
Zero/span gases should be introduced at the SAMPLE IN fitting at normal sample inlet flow
rate.
NOTE