GB2345546A - Hall effect pressure transducer comprising a diaphragm and a connection rod - Google Patents
Hall effect pressure transducer comprising a diaphragm and a connection rod Download PDFInfo
- Publication number
- GB2345546A GB2345546A GB9900057A GB9900057A GB2345546A GB 2345546 A GB2345546 A GB 2345546A GB 9900057 A GB9900057 A GB 9900057A GB 9900057 A GB9900057 A GB 9900057A GB 2345546 A GB2345546 A GB 2345546A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- pressure transducer
- unit
- pressure
- rod
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0041—Transmitting or indicating the displacement of flexible diaphragms
- G01L9/007—Transmitting or indicating the displacement of flexible diaphragms using variations in inductance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
A pressure transducer unit to be attached to areas which are under pressure or in a vacuum. The unit measures using a galvanomagnetic medium. Through the movement of a rod ( Fig 18 ) connected to a flexing diaphragm ( Fig 24 ). Changes in pressure cause the diaphragm to distort. Movement of the rod is detected by changes in the magnetic field of a GaAs Hall chip mounted on the rod in position ( Fig 19 ). Two magnets ( Fig 15 ) provide a magnetic field which the rod and GaAs Hall chip pass through. There is no direct contact between the Hall chip and the magnets. Measurement is made though the linear relationship in the displacement of the Hall chip and the magnetic field. An LED display provides the information on magnetic linear movement created by diaphragm distortion. This information is displayed on the unit, or at a distance via electronic cable or radio transmission.
Description
PRESSURE TRANSDUCER USING THE HALL EFFECT (Technical
Field}
This invention relates to an instrument to measure without direct contact the existence of both positive and negative pressure psi and in the medium of a vacuum
Hg.
{Background} Pressure gauges have traditionally worked with the use
of a Bourdon gauge, which straightens under pressure
and moves a pointer round a scale. The pointer can also
be activated through the use of a liquid under pressure.
The pressure can be displayed on a LED unit connected
to the measuring unit or at an external site.
{Essential
Technical features}
According to the present invention a method of measuring pressure using a galvanomagnetic unit, separated from the fluid or gas under pressure or in a vacuum by a diaphragm, the diaphragm is connected to a shaft which moves when the diaphragm is under pressure or in a vacuum, movements in the shaft are measured using a galvanomagnetic method, the shaft has a GaAs Hall chip positioned at its end, as this moves through the linear region of a magnetic field the change of the Hall voltage output is directly proportional to any movement in the shaft cased by movement in the pressure element, an air gap separates the magnetic units from the end of the shaft, magnetic interference is reduced by using none ferromagnetic material in areas of magnetic measurement, there is no direct contact between the pressure elements and the measurement element of the unit, the linear relationship between the displacement of the Hall chip and the magnetic field over the air gap is determined for different ranges of pressure elements, the display of pressure is on a LED unit ether connected to the housing of the invention or in a different location connected via an electronic cable, a radio transmission of the linear displacement is also envisaged.
{Example} A specific embodiment of the invention will now be
described by way of example with reference to the
accompanying drawing in which:
Figure I shows the housing threaded holes for the front panel to
line up to.
Figure 2 shows the casing outer body.
Figure 3 shows a fixing hole in the magnetic holding block.
Figure 4 indicates a rubberised sealing hole for cable access.
Figure 5 indicates the magnetic holding block.
Figure 6 shows the recessed area of the holding block.
Figure 7 shows the threaded tube between the diaphragm unit
and the casing outer body as it enters the outer body.
Figure 8 shows guidence shank to outer casing body.
Figure 9 indicates the connecting tube between the diaphragm
housing and the casing outer body.
Figure 10 shows fixing hole brackets connected to the magnetic
holding block.
Figure 11 indicates location of pipe under enquiry.
Figure 12 shows location of connecting pipe between diaphragm
and pipe under enquiry.
Figure 13 shows connection pipe threaded.
Figure 14 indicates a positioning screw hole.
Figure 15 shows a magret.
Figure 16 shows the positioning screw.
Figure 17 shows a side view of the casing outer body.
Figure 18 indicates the moving rod connected to the diaphragm.
Figure 19 shows a recessed area in the rod into which the hall chip
is positioned.
Figure 20 shows the diaphragm which flexes under pressure or
in a vacuum.
Figure 21 indicates a securing hole in the top housing part of the
diaphragm hosing unit.
Figure 22 shows the Fig 9 connection to the diaphragm housing.
Figure 23 shows a top down view of the diaphragm unit.
Figure 24 shows a side view of the rod and diaphragm connection.
Figure 25 indicates the position of the sealant ring.
Figure 26 shows the securing bolts for the diaphragm unit.
Figure 27 indicates the area below the diaphragm which would
be under enquiry.
Figure 28 shows a side view of the pipe under enquiry and the
intrusion into the pipe be Fig 12.
Figure 29 shows front panel aligning hole.
Figure 30 Indicates a LED display unit.
Figure 31 shows front panel.
Claims (6)
- CLAIMS 1. A pressure transducer unit to be attache to areas which are under pressure or in a vacuum. The unit measures using a galvanomagnetic medium, this is achieved through the movement of a rod connected to a diaphragm. The diaphragm distorts under applied pressure and also when subjected to a vacuum. These movements in the diaphragm are transferred along the rod. A GaAs hall chip is attached to the rod at the opposite end to the diaphragm. A magnetic field generated by two fixed magnets is present in the area of the GaAs hall chip.Measurement is made through the linear relationship in the displacement of the Hall chip and the magnetic field. An LED display indicates the displacement detected in the diaphragm.This LED display can be connected to the unit via electronic cable or be situated at a distance and connected by radio transmission.
- 2. A pressure transducer unit as claimed in Claim 1 where a diaphragm is connected to the unit and housed in a diaphragm housing.
- 3. A pressure transducer unit as claimed in Claim 1 or Claim 2 where the diaphragm is put under pressure or vacuum through a connecting pipe.
- 4. A pressure transducer unit as claimed in Claim 1 or 2 or 3 which can be calibrated for different pressure or vacuum requirements through the use of differing diaphragms.
- 5. A pressure transducer unit as claimed in Claim 1 or 2 or 3 or 4 where the GaAs hall chip and the magnets have no direct contact and measurement is achieved over an air gap.
- 6. A pressure transducer unit as claimed in any preceding claim which is made from none ferromagnetic material in areas of magnetic measurement.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9900057A GB2345546A (en) | 1999-01-05 | 1999-01-05 | Hall effect pressure transducer comprising a diaphragm and a connection rod |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9900057A GB2345546A (en) | 1999-01-05 | 1999-01-05 | Hall effect pressure transducer comprising a diaphragm and a connection rod |
Publications (2)
Publication Number | Publication Date |
---|---|
GB9900057D0 GB9900057D0 (en) | 1999-02-24 |
GB2345546A true GB2345546A (en) | 2000-07-12 |
Family
ID=10845513
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9900057A Withdrawn GB2345546A (en) | 1999-01-05 | 1999-01-05 | Hall effect pressure transducer comprising a diaphragm and a connection rod |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2345546A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004053450A1 (en) * | 2002-12-10 | 2004-06-24 | Dresser, Inc. | Wireless transmitting pressure measurement device |
WO2005003713A2 (en) * | 2003-06-24 | 2005-01-13 | Cidra Corporation | Contact-based transducers for characterizing unsteady pressures in pipes |
US6986602B2 (en) | 2003-03-27 | 2006-01-17 | Dresser, Inc. | Temperature measurement device |
US7197938B2 (en) | 2003-06-24 | 2007-04-03 | Cidra Corporation | Contact-based transducers for characterizing unsteady pressures in pipes |
US7322744B2 (en) | 2003-03-27 | 2008-01-29 | Ashcroft, Inc. | Temperature measurement device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1109624A1 (en) * | 1983-04-29 | 1984-08-23 | Марыйская Государственная Районная Электрическая Станция Им.50-Летия Ссср (Марыйская Грэс) | Correction device for gaseous mixture composition and consumption pickup |
GB2159282A (en) * | 1984-05-21 | 1985-11-27 | Nat Nuclear Corp Ltd | Monitoring pressure within a vessel |
US4581941A (en) * | 1985-03-18 | 1986-04-15 | Controls Company Of America | Combined electronic pressure transducer and power switch |
EP0250133A1 (en) * | 1986-06-12 | 1987-12-23 | Barry Wright Corporation | Overload protection device |
US4856339A (en) * | 1986-11-17 | 1989-08-15 | Centaur Sciences, Inc. | Medical infusion pump with sensors |
GB2256050A (en) * | 1991-05-16 | 1992-11-25 | David Alick Burgoyne | Transducer using hall effect sensor |
-
1999
- 1999-01-05 GB GB9900057A patent/GB2345546A/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU1109624A1 (en) * | 1983-04-29 | 1984-08-23 | Марыйская Государственная Районная Электрическая Станция Им.50-Летия Ссср (Марыйская Грэс) | Correction device for gaseous mixture composition and consumption pickup |
GB2159282A (en) * | 1984-05-21 | 1985-11-27 | Nat Nuclear Corp Ltd | Monitoring pressure within a vessel |
US4581941A (en) * | 1985-03-18 | 1986-04-15 | Controls Company Of America | Combined electronic pressure transducer and power switch |
EP0250133A1 (en) * | 1986-06-12 | 1987-12-23 | Barry Wright Corporation | Overload protection device |
US4856339A (en) * | 1986-11-17 | 1989-08-15 | Centaur Sciences, Inc. | Medical infusion pump with sensors |
GB2256050A (en) * | 1991-05-16 | 1992-11-25 | David Alick Burgoyne | Transducer using hall effect sensor |
Non-Patent Citations (1)
Title |
---|
WPI ACC. NO. 85-073 234 & SU 1 109 624 A * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004053450A1 (en) * | 2002-12-10 | 2004-06-24 | Dresser, Inc. | Wireless transmitting pressure measurement device |
US7140257B2 (en) | 2002-12-10 | 2006-11-28 | Ashcroft Inc. | Wireless transmitting pressure measurement device |
US6986602B2 (en) | 2003-03-27 | 2006-01-17 | Dresser, Inc. | Temperature measurement device |
US7165461B2 (en) | 2003-03-27 | 2007-01-23 | Ashcroft, Inc. | Pressure gauge having dual function movement plate |
US7322744B2 (en) | 2003-03-27 | 2008-01-29 | Ashcroft, Inc. | Temperature measurement device |
WO2005003713A2 (en) * | 2003-06-24 | 2005-01-13 | Cidra Corporation | Contact-based transducers for characterizing unsteady pressures in pipes |
WO2005003713A3 (en) * | 2003-06-24 | 2005-05-06 | Cidra Corp | Contact-based transducers for characterizing unsteady pressures in pipes |
US7197938B2 (en) | 2003-06-24 | 2007-04-03 | Cidra Corporation | Contact-based transducers for characterizing unsteady pressures in pipes |
Also Published As
Publication number | Publication date |
---|---|
GB9900057D0 (en) | 1999-02-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |