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An accurate means of reading pressure in digital form in the 0 to 4000 ℗ł 2 psi range has been developed for Applied Research. The device was needed for a fast, accurate method of reading the pressure of storage and shipping containers. The device consists of four basic components which were integrated to produce a highly accurate system. The system consists of a transducer, transducer power supply, amplifier, and digital voltmeter.
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Previews available in: English
Showing 3 featured editions. View all 3 editions?
Edition | Availability |
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1
Helium Research Center internal report: a 10-channel automatic scanner with individually selectable channel times
1968, U.S. Department of the Interior, Bureau of Mines, Branch of Laboratory Services
in English
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2
Helium Research Center internal report: an RC bridge and detector for the measurement of small capacitance changes
1964, U.S. Department of the Interior, Bureau of Mines, Branch of Laboratory Services
in English
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3
Helium Research Center internal report: a digital pressure-readout device
1964, U.S. Department of the Interior, Bureau of Mines, Branch of Laboratory Services
in English
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Libraries near you:
WorldCat
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Book Details
Edition Notes
"October 1964."
"Branch of Laboratory Service, Project 820.1."
Includes bibliographical references (leaf 9).
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Work Description
An instrument for the purpose of detecting small changes in air dielectric capacitance is described. It consists of an RC bridge circuit with the associated power supply and detector. The bridge has a 26 VAC input and sine wave output which is compared with a square wave in the detector. The dc output from the detector is a measure of bridge unbalance in millivolts, with a minimum sensitivity of 10́℗đ pico-farads at 200 pico-farads. The bridge and detector assembly were designed to monitor the rate of diffusion of gases and were used successfully for this purpose. A small change in gas mixture composition changes the gas-dielectric constant; therefore, the capacitance value of a small air-type capacitor inserted into the gas mixture changes proportionally, and is recorded as a function of time.
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October 3, 2019 | Created by ImportBot | Imported from Internet Archive item record |