Teledyne 7300a - NDIR analyzer - Manual (Page 25)

Infrared Gas Analyzer Installation 2
2-13 Teledyne Analytical Instruments
1. Introduce zero fluid and set zero as referred in section 4.4.1
NOTE: When calibrating from 0% to an upper concentration gas, obtain
a zero gas (minus the analyte) that typically is as pure as the minimum resolution
needed to control to. This usually meets or exceeds the minimum full scale
accuracy of the measurement.
2. Introduce a span fluid and set the concentration of the span fluid.
Refer to the span procedure in section 4.4.2. (Note: The span gas should
typically be an 80% of full scale range gas similar to the 100% zero gas
background; i.e., 100% CO
2
zero gas and a span gas of 98.4% CO2 in N2 for
a 98-100%CO2 purity application.