Teledyne 7320 - NDIR analyzer - Manual (Page 27)

Infrared Gas Analyzer Installation 2
2-13 Teledyne Analytical Instruments
Power up the system, and test it by performing the following
operations:
1. Repeat the Self-Diagnostic Test, section 5.2
2.6 Calibration
2.6.1 Calibration Fluids
Zero fluids must be made by the chemistry lab or certified zero and span
gas bought from a gas supplier. The zero fluid must be the major component of
the sample, free from the component of interest..
Note: In Non-purity applications, the reference cell may be sealed
with clean air (consult factory).
The span fluid must be the major component of the sample mixed with
a small amount of the component of interest. The concentration must be 80 to
95% of the full scale range or the widest range of the instrument (if the instrument
provides more than one range).
2.6.2 Calibration
Refer to Section 4.4 of the manual to determine how to manipulate the
mode setting. The recommended calibration method is as follows:
Method:
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.