Teledyne 6600 2.3The Automatic Zero System, From B71046-0or customer’s piping schematic, 1-4Part

Part III Model 6600

The procedure to set up the optical bench, the signal processing front-end amplifiers, the standardization of outputs, and alarm systems are described in separate sections for each access.

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, non-oil, background chemicals below zero on an hourly basis.

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 back-flush solenoids for low oil range, very low background applications

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. 0-20ppm oil down to 0-10ppm oil in very clean waters such as steam condensates, cool- ing waters, clear sea waters: (3 and 4, if no sample pressure or gravity feed available).

Note: Assume sample inlet contains dissolved oil and is homogeneous.

1-4 Part III Teledyne Analytical Instruments