Instruction Manual
June 2007
NGA 2000 CLD
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| Exhaust | Ozonator Air |
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Exhaust Fan | Sample IN | Intake Fan |
Figure
b.Connections
Connect inlet and outlet lines for sample, ozonator air, and exhaust to appropriately labeled fittings on the rear panel (see Figure
Stainless steel or Teflon tubing is recommended for the sample line. Exhaust tubing should be 1/4 inch (6.3 mm) or larger, and made of stainless steel or Teflon.
Zero/span gases should be introduced at the SAMPLE IN fitting at normal sample inlet flow rate/pressure.
c.Specifications
Each gas should be supplied from a cylinder equipped with a clean,
Ozonator Source Gas
For analyzers with ranges less than 0 to 2,500 ppm NOx free ambient air should be used for generation of the ozone required for the chemiluminescence reaction. For ranges higher than 0 to 2,500 ppm, NOx free oxygen is required. See Table
When using ambient air an external air conditioning unit (LAM) can optionally be used (contact your local service or sales office).
CAUTION
At no time should ozonator gas pressure exceed 2,070
Zero Gas
Nitrogen (N2) is recommended for use as zero gas. Alternatively synthetic air or NOx free ambient air can be used.
Calibration Gas
A mixture of NO in a background of nitrogen is recommended as span gas. For maximum accurancy, the concentration of NO in the span gas should be about 80 % to 100 % of full scale range.
Sample Gas Pressure
See Table
Bypass Sample Gas Flow
Bypass sample gas flow rate should be between 700 and 2,000 cc/min. with backpressure regulator pressure (see Capillary Pressure in „Current Measurement Pa- rameters“ menu, which can be viewed by selecting the PARMS softkey in "Main Menu") adjusted to 344 hPa (5 psig).
Emerson Process Management GmbH & Co.OHG | Installation 2 - 3 |