GB592379A - Improvements in vacuum gauges - Google Patents
Improvements in vacuum gaugesInfo
- Publication number
- GB592379A GB592379A GB1213845A GB1213845A GB592379A GB 592379 A GB592379 A GB 592379A GB 1213845 A GB1213845 A GB 1213845A GB 1213845 A GB1213845 A GB 1213845A GB 592379 A GB592379 A GB 592379A
- Authority
- GB
- United Kingdom
- Prior art keywords
- piston
- block
- gas
- mercury
- casing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000011521 glass Substances 0.000 abstract 5
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 abstract 5
- 229910052753 mercury Inorganic materials 0.000 abstract 5
- 230000008878 coupling Effects 0.000 abstract 2
- 238000010168 coupling process Methods 0.000 abstract 2
- 238000005859 coupling reaction Methods 0.000 abstract 2
- 239000007788 liquid Substances 0.000 abstract 2
- 239000007787 solid Substances 0.000 abstract 2
- 229910001361 White metal Inorganic materials 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 abstract 1
- 239000004519 grease Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000010969 white metal Substances 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L21/00—Vacuum gauges
- G01L21/02—Vacuum gauges having a compression chamber in which gas, whose pressure is to be measured, is compressed
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
592,379. Vacuum gauges. EDWARDS & CO. (LONDON), Ltd., W., TILLS, J. W., and POTTS, F. C. May 15,1945, No. 12138. [Class 106 (ii)] In a compression-type vacuum gauge, a standard volume of gas at the pressure to be measured is compressed partly by the displacing action of a solid member in direct contact with the gas and partly by the displacing action of an operating liquid. In the gauge shown, the solid member comprises a piston 21 movable in a liner pressed into a block 23 mounted on a base block 24 which has an axial bore or reservoir to receive loosely a portion of the piston having a reduced diameter. A cylindrical casing 22 is mounted, by means of a lower joint ring, upon the block 23 and is sealed at its upper end by a diaphragm 87 which is held in position in an upper joint ring by means of a cap 85, the latter being clamped down by several holding-down bars 18, the lower ends of which are secured in the block 23. Rotation of a hand wheel 83, mounted in the cap 85, moves a cranked arm 91 vertically and so, by means of multiplying levers, moves a coupling block 100 secured to a pipe 34 which has a header cup 35 and is a sliding fit in a bore in the piston 21. A bolt 93, engaged in the piston, slides freely in a bore in the coupling block and a tension spring (not shown) extends from the piston to the upper joint ring of the casing. Gas at the pressure to be determined communicates with the interior of the casing by means of a flanged connection 36 and bores or grooves in the block 23 and lower joint ring. A gauge glass 28 has its ends sealed into adaptors 40, 46 mounted in lugs 25 and 29 respectively welded to the block 23 and casing 22 and is in communication with the space surrounding the reduced end of the piston by means of holes bored in the lug 25, block 23 and liner. The upper adaptor 46 is in contact with a plunger 45 movable by means of a cam 81 which is bored eccentrically to receive a cranked guard 80, the lower end of which is secured in the lug 25. By rotating the cam 81 by means of a tool, the tension in the guard 80 is released and the gauge glass may be removed so that mercury may be introduced into the reservoir in the base block 24. Such liquid may be drained off by means of a screw plug. In use, the hand wheel 83 is rotated and a standard volume of gas at the pressure to be measured is trapped when the lower end of the pipe 34 dips into the mercury. The trapped gas is then compressed initially by the movement of the piston itself and then by the displacement of mercury from the reservoir by the reduced portion of the piston. The lower edge of the larger portion of the piston is chamfered and has a recess 21c to enable the compressed gas to escape into the gauge glass. The quantity of mercury and the position of a plug 47 in the upper end of the gauge glass are adjusted so that, when the piston is in its lowermost position, the level of mercury in the header cup 35 coincides with the lower end of the plug 47. A scale plate, against which the final volume of the gas may be read, is attached to the casing 22. In a modification, the lower joint ring is sealed to the block 23 by means of a lead or white-metal grummet having annular grooves in association with a grease cup, and, moreover, the gauge glass is surrounded by a protective tube held between the adaptors 40 and 46.
Publications (1)
Publication Number | Publication Date |
---|---|
GB592379A true GB592379A (en) | 1947-09-16 |
Family
ID=1715564
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1213845A Expired GB592379A (en) | 1945-05-15 | Improvements in vacuum gauges |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB592379A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3145569A (en) * | 1960-09-29 | 1964-08-25 | Monostat Corp | Open end mcleod-type gauge and method |
DE102011106111A1 (en) * | 2011-06-09 | 2012-12-13 | Fresenius Medical Care Deutschland Gmbh | Method and device for determining at least one absolute pressure-dependent operating parameter of an extracorporeal blood treatment device, device for extracorporeal blood treatment |
-
1945
- 1945-05-15 GB GB1213845A patent/GB592379A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3145569A (en) * | 1960-09-29 | 1964-08-25 | Monostat Corp | Open end mcleod-type gauge and method |
DE102011106111A1 (en) * | 2011-06-09 | 2012-12-13 | Fresenius Medical Care Deutschland Gmbh | Method and device for determining at least one absolute pressure-dependent operating parameter of an extracorporeal blood treatment device, device for extracorporeal blood treatment |
DE102011106111B4 (en) * | 2011-06-09 | 2013-11-21 | Fresenius Medical Care Deutschland Gmbh | Method and device for determining at least one absolute pressure-dependent operating parameter of an extracorporeal blood treatment device, device for extracorporeal blood treatment |
US9656012B2 (en) | 2011-06-09 | 2017-05-23 | Fresenius Medical Care Deutschland Gmbh | Method and device for determining at least one operating parameter of a device for extracorporeal blood treatment as a function of absolute pressure; the device for extracorporeal blood treatment |
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