Accession Number : ADD014003

Title :   Automatic Oxygen Measuring System.

Descriptive Note : Patent, Filed 27 Feb 85, patented 19 Jul 88,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Krawetz, Arthur A ; Tovrog, Theodore

Report Date : 19 Jul 1988

Pagination or Media Count : 30

Abstract : This invention relates generally to an automated measuring system for determining gas contents of fluids, and, in particular, relates to a system for determining the inherent oxidation stability of base oils and lubricants over a temperature range and for a period of time. A great variety of standardized tests have been developed over the years in an attempt to simulate in the laboratory the conditions of oxidation to which lubricants are exposed during the course of their operative life. Described is an automatic oxygen absorption measuring system having a controllable source of pressurized oxygen, a controllable venting device, and a device for indicating incremental gas volume changes connected through a controlled gas reservoir to an oxygen circulating testing section where oxygen is passed through a liquid sample at a fixed temperature. Upon the liberation of other gases than oxygen or absorption of oxygen, the gas pressure changes a liquid fluid level in the device for indicating incremental gas changes. An electronic circuit causes the venting or inputting of gas until an equilibrium pressure is obtained. Each change is noted on a recording device. The device for indicating incremental gas volume changes has two glass bulbs attached in line with a manometer filled with electrically conductive liquid fluid. Four electrical contacts placed about the bulbs indicate the level of the liquid fluid. In response to the liquid contacting these contacts, the electronic circuit operates the controllable devices to achieve an equilibrium pressure. Patents. (kt)

Descriptors :   *LUBRICANTS, *OXYGEN, *PATENTS, *MEASURING INSTRUMENTS, ABSORPTION, AUTOMATIC, AUTOMATION, CIRCUITS, CIRCULATION, CONDUCTIVE LIQUIDS, CONTROL, ELECTRIC CONTACTS, ELECTRICAL CONDUCTIVITY, ELECTRONICS, EQUILIBRIUM(GENERAL), FLUIDS, GASES, GLASS, INDICATORS, LIQUIDS, MANOMETERS, MEASUREMENT, OILS, OXIDATION, PRESSURE, PRESSURIZATION, RECORDING SYSTEMS, RESERVOIRS, RESPONSE, STABILITY, STANDARDIZATION, TEMPERATURE, TEST AND EVALUATION, TIME, VENTING

Subject Categories : Lubricants and Hydraulic Fluids
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE