Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) User Manual
Page 98
Appendix Model
4020
Teledyne
Analytical
Instruments
80
Application Data
Model
Number:
Serial
Number:
Ranges
Of
Analysis:
Output
Signal:
Start-Up Span Setting:
Control Panel Pressure Settings:
Comments:
Blanket Air:
Fuel:
Sample:
Bypass Flowrate: A minimum of 0.25 SCFH is indicated on
the integral flowmeter
Recommended Support Gases: The accessory gases should all be
laboratory analyzed and certified as to
their hydrocarbon content.
Blanket Air: Water pumped, hydrocarbon free,
compressed air.
Zero Gas: Water pumped, hydrocarbon free
(certified)
Span Gas: ppm methane in
(certified)
The span gas contains a known amount of methane impurity. The
span gas must be certified as to its methane equivalent impurity.
IMPORTANT: For the best possible results, zero and span
gases that are representative of the parent (or
background) gas should always be used.
This is particularly true in applications where the analyzer is being used
to analyze a number of different samples with varying concentrations of
oxygen. The geometry and temperature of the flame will be somewhat
dependent on the oxygen content of the sample. Alterations in the flame
configuration will lead to differences in output readings. For the best possible
results, TAI recommends that zero and span gases representative of each of
these samples be used to standardize the analyzer.