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Installation Model 7600
Teledyne Analytical Instruments 30
2.5.6 Purging the Analyzer
In general, purging the analyzer is not required unless one of the
following cases apply:
• A combustible gas component is contained in sample gas.
• Corrosive gas is contained in the atmospheric air at the
installation site.
• The same gas as the sample gas component is contained in
the atmospheric air at the installation site.
In the above situations, the inside of analyzer should be purged
with instrument air or N
2
. Use a purge flow rate of about 1 L/min.
Use a filter to remove dust or mist from the purge gas.
2.5.7 Sample Gas Pressure
The sample gas pressure at the outlet should be atmospheric
pressure.
2.5.8 Example configuration of gas sampling system
A typical system configuration with five component gas analysis
for monitoring combustion exhaust gas from boiler, refuse incinerator,
etc. is shown in Figure 2-8. Contact Teledyne for specific application
system configuration or further information.
The system shown is comprised of:
• Model 7600—with dual measuring unit option and external
zirconia oxygen sensor.
• Gas Extractor—with stainless steel filter of standard mesh 40
μm equipped with integral heater.
• Mist Filter—to remove condensate, mist and dust from the
sample before it enters the analyzer.
• Safety Drain Trap—with two compartments for positive and
negative pressure. It monitors and adjusts the sample gas
pressure.
• Gas Aspirator—to aspirate the sample gas.
• Electronic Gas Cooler—used to dry the sample gas to a dew
point of approximately 2°C (35.6°F).