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Teledyne API T801 NDIR CO2 Analyzer Operation Manual Principles of Operation
205
Figure 12-2. CO
2
Sensor PCA Layout and Electronic Connections
12.3. PNEUMATIC OPERATION
CAUTION
GENERAL SAFETY HAZARD
It is important that the sample airflow system is both leak-tight and not pressurized over
ambient pressure.
Regular leak checks should be performed on the analyzer as described in the maintenance
schedule, 10.1. Procedures for correctly performing leak checks can be found in Section
10.3.3
In pneumatic operation an internal pump creates a vacuum that draws sample gas
into the analyzer. Normally the analyzer is operated with its inlet near ambient
pressure either because the sample is directly drawn at the inlet or a small vent is
installed at the inlet when the sample is delivered under pressure. There are
several advantages to this “pull through” configuration.
First the pumping process heats and compresses the sample complicating the
measurement process. Both heat and pressure affect the accuracy of gas
measurements.
Additionally, certain physical parts of the pump itself are made of materials that
might chemically react with the sample gas.
07274B DCN6418