THE DESIGN AND PERFORMANCE OF PRECISION OIL MICROMANOMETERS
Abstract
The micromanometers developed consist of a glass U-tube, a fluid reservoir, an optical system capable of reading the meniscus position with an accuracy of a hundredth of a millimeter, and a means of read out. The fluid found to be most suitable is the ten centistokes viscosity silicone oil, which is perfectly clear, very stable chemically, and has low vapor pressure and low kinematic viscosity. The use of this fluid instead of mercury increases the sensitivity by a factor of about 15. These micromanometers are generally accurate to about one micron Hg, or 0.1 percent, whichever is greater. The maximum practical range is about 50 mm Hg. A method for producing pressure differences of a few microns Hg which makes use of a heated air column is described for checking the accuracy of micromanometers at very low pressures. The application of the micromanometer in making measurements of small volumes such as those associated with pressure transducers and valves is described. Some detailed suggestions for the practical use of micromanometers are given. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 29, 1961
- Accession Number
- AD0267656
Entities
People
- J.m. Kendall
Organizations
- Naval Ordnance Laboratory