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Title: Precision manometer gauge

Abstract

A precision manometer gauge which locates a zero height and a measured height of liquid using an open tube in communication with a reservoir adapted to receive the pressure to be measured. The open tube has a reference section carried on a positioning plate which is moved vertically with machine tool precision. Double scales are provided to read the height of the positioning plate accurately, the reference section being inclined for accurate meniscus adjustment, and means being provided to accurately locate a zero or reference position.

Inventors:
;
Publication Date:
OSTI Identifier:
5823456
Application Number:
ON: DE83018045
Assignee:
ERA-08-054777; EDB-83-179037
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; PRESSURE GAGES; DESIGN; TUBES; WATER; HYDROGEN COMPOUNDS; MEASURING INSTRUMENTS; OXYGEN COMPOUNDS; 440300* - Miscellaneous Instruments- (-1989)

Citation Formats

McPherson, M.J., and Bellman, R.A.. Precision manometer gauge. United States: N. p., 1982. Web.
McPherson, M.J., & Bellman, R.A.. Precision manometer gauge. United States.
McPherson, M.J., and Bellman, R.A.. Mon . "Precision manometer gauge". United States. doi:.
@article{osti_5823456,
title = {Precision manometer gauge},
author = {McPherson, M.J. and Bellman, R.A.},
abstractNote = {A precision manometer gauge which locates a zero height and a measured height of liquid using an open tube in communication with a reservoir adapted to receive the pressure to be measured. The open tube has a reference section carried on a positioning plate which is moved vertically with machine tool precision. Double scales are provided to read the height of the positioning plate accurately, the reference section being inclined for accurate meniscus adjustment, and means being provided to accurately locate a zero or reference position.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Sep 27 00:00:00 EDT 1982},
month = {Mon Sep 27 00:00:00 EDT 1982}
}
  • A precision manometer gauge which locates a zero height and a measured height of liquid using an open tube in communication with a reservoir adapted to receive the pressure to be measured. The open tube has a reference section carried on a positioning plate which is moved vertically with machine tool precision. Double scales are provided to read the height of the positioning plate accurately, the reference section being inclined for accurate meniscus adjustment, and means being provided to accurately locate a zero or reference position.
  • A precision manometer gauge which locates a zero height and a measured height of liquid using an open tube in communication with a reservoir adapted to receive the pressure to be measured. The open tube has a reference section carried on a positioning plate which is moved vertically with machine tool precision. Double scales are provided to read the height of the positioning plate accurately, the reference section being inclined for accurate meniscus adjustment, and means being provided to accurately locate a zero or reference position.
  • An ionization vacuum gage is described which offers ease and uniformity of manufacture and degassing by heating. The central straight collector wire is surrounded by a cylinder of spiral grid wires. This arrangement is enclosed in a circular wire cathode and a screening electrode. (T.R.H.)
  • Bipolar inputs are afforded by the plus inputs of first and second differential input amplifiers. A first gain determining resister is connected between the minus inputs of the differential amplifiers. First and second diodes are connected between the respective minus inputs and the respective outputs of the differential amplifiers. First and second FETs have their gates connected to the outputs of the amplifiers, while their respective source and drain circuits are connected between the respective minus inputs and an output lead extending to a load resister. The output current through the load resister is proportional to the absolute value ofmore » the input voltage difference between the bipolar input terminals. A third differential amplifier has its plus input terminal connected to the load resister. A second gain determining resister is connected between the minus input of the third differential amplifier and a voltage source. A third FET has its gate connected to the output of the third amplifier. The source and drain circuit of the third transistor is connected between the minus input of the third amplifier and a voltage-frequency converter, constituting an output device. A polarity detector is also provided, comprising a pair of transistors having their inputs connected to the outputs of the first and second differential amplifiers. The outputs of the polarity detector are connected to gates which switch the output of the voltage-frequency converter between up and down counting outputs.« less