Loading...
Please wait, while we are loading the content...
Similar Documents
Performance tests of a gas blending system based on mass-flow controllers
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Evans Jr., A. |
| Copyright Year | 1981 |
| Description | The system provides many of the gas mixtures required for calibrating analytical instruments used in engine exhaust gas analysis and is capable of blending from one to four additive gases with either of two carrier gases in concentrations from 20 ppm to 50%. Two mixtures can be flowing simultaneously. Performance tests were made to determine the stability accuracy of the system while it was in limited use for a period of 2 years. The accuracy of the blender was measured by comparing binary mixtures from the blender with National Bureau of Standards standard reference materials. Analytical instruments were used to make these comparisons. The expected accuracy of 2% was obtained in some of the tests, by the majority showed a systematic biAs of -5%. Although these tests revealed subtle instabilities in the flow controllers that contributed to the random scatter of data, the accuracy of wet test meters and bubble flowmeters used for calibration is marginal for this purpose. A simple procedure is recommended that should enable the full potential of the system to be realized. |
| File Size | 977481 |
| Page Count | 17 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810020708 |
| Archival Resource Key | ark:/13960/t71w0b91n |
| Language | English |
| Publisher Date | 1981-08-01 |
| Access Restriction | Open |
| Subject Keyword | Propellants And Fuels Mixing Performance Tests Accuracy Chemical Analysis Mass Flow Rate Gas Flow Calibrating Exhaust Gases Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
