Infrared Gas Analyzer Installation
Teledyne Analytical Instruments 29
• The dew point of the sample gas must be lower than the
ambient temperature to avoid condensation in the analyzer. If
vapor is contained in the sampling gas, the dew point should
be lowered to 0°C by using a dehumidifier.
• If SO2 mist is contained in the sample gas, use a mist filter or
cooler to remove the SO2 mist. Other mists should be
removed by using an appropriate mist filter or cooler.
• Corrosive gases such as Cl2, F2 and HCl, if contained in the
sample gas in considerable amounts, will shorten the life of
the instrument.
• Sample gas temperature should be within 0 to 50°C. Hot gas
should not be fed directly into the instrument.
2.5.4 Flowrate
Use a flowrate of 0.5L/min ±0.2L/min. The sample system should
be designed to avoid any flow fluctuation during measurement.
Use a flowmeter to observe the flow reading as shown in the
external piping diagrams of Figures 2.5, 2.6 and 2.7.
2.5.5 Preparation of Calibration Gas
Routine calibration using calibration gases is required for
optimizing the performance of this instrument. Once a week is a
suggested calibration frequency. Table 2-2 indicates the zero and span
gas required for calibration.
Table 2-2: Zero and Span Gas
Analyzer without
O2 Analyzer with built-in
O2 Analyzer with external
zirconia O2 sensor
Zero gas N2 gas N2 gas Dry air
Span gas
other than for
O2
t
Gas concentration
of 90% or more of
full scale
Gas concentration of
90% or more of full
scale
Gas concentration of 90%
or more of full scale
Span gas for
O2 analysis NA Gas concentration of
90% or more of full
scale
1 to 2% O2