Teledyne 7600 operating instructions Flowrate, Preparation of Calibration Gas

Infrared Gas Analyzer Installation

•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.

2.5.4Flowrate

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	Analyzer with built-in	Analyzer with external
	O2	O2	zirconia O2 sensor
Zero gas	N2 gas	N2 gas	Dry air
Span gas	Gas concentration	Gas concentration of	Gas concentration of 90%
other than for	of 90% or more of	90% or more of full	or more of full scale
O2	full scale	scale
t		Gas concentration of	1 to 2% O2
Span gas for	NA
O2 analysis		90% or more of full
		scale

Teledyne Analytical Instruments 29