Teledyne 7120 - NDIR analyzer - Manual (Page 78)

A-2
Appendix Model 7120
Teledyne Analytical Instruments
7120 Specifications
% Range(s) PPM Ranges
· 98-100% (CO2 purity) 0-500 ppm H2Ov in CL2, N2, CO or
COC/2
Other percent applications Other ppm applications
· 95-100% CO in H2, N2, O2 0-1000ppm CO in flue gas
· 90-100% CH4 Purity 0-500 ppm N2O
· 0-1% H2Ov in Air 0-100ppm CO2 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% + assay pure
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.