Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 47)

Total Hydrocarbon Analyzer Operation
Teledyne Analytical Instruments 29
Operation
This section of the manual describes how to setup and operate the
Model 4020 Analyzer. Sections 4.1 through 4.5 describe preliminary
steps and equipment needed to operate the analyzer. Beginning with
Section 4.7, the actual operation of the analyzer is described along with
descriptions of the display prompts, messages and options available to
the user within a menu or sub menu.
4.1 Equipment
The following supporting gases and hardware will be required to
operate the (standard) analyzer:
1. Fuel: A cylinder containing a 40% hydrogen, 60% nitrogen
composition will be required to supply the fuel for the flame
ionization burner. The cylinder is to be equipped with an oil-free
metallic diaphragm regulator (dual stage).
Note: When hydrogen is the parent gas in the application, an
auxiliary source of fuel may not be required. See the
Appendix: Specifications for specific recommendations.
2. Blanket Air: A cylinder of water-pumped (low hydrocarbon)
compressed air will be required to maintain the proper
atmosphere within the cell. The cylinder is to be equipped with
an oil-free, dual stage, metallic diaphragm regulator. Less than
1% of the full scale reading (in the selected measurement range)
of hydrocarbon contamination is advisable, if the instrument’s
accuracy is to be realized.
3. Zero Gas: A cylinder of the parent (or background) gas,
containing less than 10% full scale (of the narrowest range)
hydrocarbon impurity, will be required to zero standardize the
analyzer. For example, if 10 PPM is the narrowest range of the
instrument, then the zero gas impurities are to be less than 1
PPM. The cylinder is to be equipped with an oil-free, dual stage,
metallic diaphragm regulator.