Part III | Model 6600 | |
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The procedure to set up the optical bench, the signal processing
2.3The Automatic Zero System
The sample may contain chemicals which are not oil, but absorb UV energy at the measuring wavelength used for oil analysis, thereby interfering with the oil analysis (their signals add to the oil signal, which is the only signal of interest).
The automatic zero system is included to discriminate the two signals. It involves an electronics circuit, which drives the signal developed by the interfering,
The electronics zero circuit works in conjunction with a specially designed sample system.
The sample, which contains oil and background chemicals, is fed to the sample return port, where it progresses to the various subsections for enhance- ment in order to present the sample to the measuring cell in such a way so as to maintain the highest degree of accuracy for oil measurements.
2.4 From B71046-0 (or customer’s) piping schematic
Each of these subsections with piping flow components are identified with rectangular dotted lines to indicate their importance based upon a particular oil measurement application.
For Example, there are 4 basic process sampling considerations:
1.Required use of a homogenizer/dearator and filter assemblies for high oil range (>20ppm high background applications).
2.Required use of filter assemblies for low oil (<20ppm oil, high background).
3.Required use of
4.Required use of a pump assembly for low pressure (<10 psig) or no gravity feed applications).
In general, but not without exceptions, the following applications could involve items 1 through 4 above or combinations thereof.A.
Note: Assume sample inlet contains dissolved oil and is homogeneous.
| Teledyne Analytical Instruments |