Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 48)

Operation Model 4020
Teledyne Analytical Instruments 30
4. Span Gas: A cylinder containing a composition consisting of the
parent gas and a specified (see Appendix: Specifications) amount
of methane will be required to standardize the sensitivity setting
of the analyzer. The cylinder is to be equipped with an oil-free,
dual stage metallic diaphragm regulator.
Note: The analyzer is capable of analyzing a sample in two
different background gases, O
2
and N
2
. To use this feature
you must calibrate the instrument with each background
gas. Therefore separate zero and span gases will be
required for each background gas.
5. Sample Pressure Regulation: An oil-free, metallic diaphragm
regulator must be installed at the sample point when possible; see
Section 3.3.5.1 Sample Gas.
6. Background Gas Selector: If using different sample
background gases, a suitable manifold for switching the gas to
the analyzer will be required. It can be either manual or
automatically operated valves.
4.2 Preliminary Power-Off Check List
Make the following checks of the installation before proceeding
further into the start-up procedure:
1. Check to see that the sample and supporting gas installation is in
accordance with the specifications called for in the installation
and application sections of the manual (Chapter 3). Be sure that
the supporting gases are of the proper composition and are
connected to the correct fittings at the rear of the analyzer.
2. Check to see that the electrical installation conforms to the
instructions contained in the installation section (Chapter 3) and
on the input-output diagram.
3. Open the door and check to see that the printed circuit boards
and cables are firmly seated in their respective sockets.
4. Confirm that recorder and alarm connections are properly made.
4.3 Placing the System in Operation
1. Turn the power switch to the ON position.