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Appendix
% Range(s)
·
98-100% (CO2 purity)
Other percent applications
·
95-100% CO in H2, N2, O2 0-1000ppm CO in flue gas
·
90-100% CH4 Purity
·
0-1% H2Ov in Air
·
0-10% NH3 in Air
·
0-100% CH4 in Natural gas
·
0-10% CH4 in C2...C6 aliphatics
Above are typical percent and ppm ranges possible for a few sample gas
applications.
Other ranges and gases possible with optical cell path/optical filter changes
(consult factory).
Detector Type Lead salt as PbSe or PbS
Span Calibration
·
Calibration can be done in many ranges: choose a typical 80% of
range span gas.
Example: zero 99.995%CO2; span 98.40% CO2 in N2
·
Ultra pure Span calibration gas is recommended for purity applica-
tions.
Zero Calibration (Auto zero every 3 hours required)
·
Ultra pure Zero calibration to be performed using 99.99%
CO2
·
Flowing reference gas required at 20 ccm (purity must be same as
ultra pure zero gas)
·
Non-purity applications can use sealed air reference
·
Zero gas from 0% level; use analyte free Air or N2
·
Span gas: use an 80 % full scale analyte in typically Air or N2 for the
pertinent range of interest.
A-2
7120 Specifications
PPM Ranges
0-500 ppm H2Ov in CL2, N2, CO or
COC/2
Other ppm applications
0-500 ppm N2O
0-100ppm CO2 in Air
Teledyne Analytical Instruments
Model 7120
assay pure
+
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