Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
  • G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
  • G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
  • G01L27/005—Apparatus for calibrating pressure sensors

Definitions

• the present invention relates to pressure gauge testing apparatus.
• Such apparatus are primarily used in testing laboratories to calibrate or re-calibrate pressure measuring instruments, but can also be used to ascertain the ability of other instruments to withstand high pressures.
• An object of the present invention is to enable calibrations and tests to be done, remote from the usual testing laboratories, by providing an accurate portable pressure testing apparatus.
• the present invention consists in a pressure testing and calibrating apparatus comprising: a fluid filled pressure vessel including an observation port and a sealable hatch; a pump means attached to or integral with said pressure vessel and connected for fluid flow communication therewith, to raise the pressure within said vessel above ambient; a means to release the raised pressure within said vessel prior to unsealing said hatch; and a means to accurately ascertain the pressure within said vessel.
• said hatch includes said observation port.
• a water filled pressure vessel comprises an upstanding cylindrical pot 2, closed at one end and a circular toughened glass hatch 3 adapted to sealingly engage an open end of the pot 2.
• An annular locking collar 4 includes a plurality of circumferentially spaced, inwardly radially projecting screw-down flanges 5, mutually interengageable with respective outwardly radially projecting screw-down flanges 6, disposed adjacent the open end of the pot 2.
• the collar 4 is thus adapted to clampingly engage the hatch 3 with the open end of the pot 2 upon rotation relative to the pot 2, so as to seal thereagainst by way of a sealing gasket or ring 7.
• any suitable sealing means may be used.
• the glass hatch 3 has a convex surface 8 adapted to displace most of the air from the pot 2 upon engagement therewith when the pot is substantially full of water. The purpose being to expel air from within the pressure vessel which would otherwise impede its efficient pressurisation.
• the convex glass hatch provides a magnified image of the contents of the vessel.
• a pump piston 11 Repeatedly depressing a pump piston 11 causes water to flow unidirectionally by way of a non-return valve into the vessel 1 from a pump reservoir, thus compressing any residual air and raising the pressure within the vessel 1.
• the pump may comprise a screw-down piston and cylinder in the manner of a syringe, in which case, rotation in one direction may cause pressurization whilst rotation in the opposite direction will cause depressurization.
• Opening a valve 12 allows the pressurised water within the pressure vessel to flow back into the reservoir under the action of the compressed air.
• a pressure gauge in the form of an arcuate air filled capillary tube 13 is disposed within the glass hatch and when in use provides a measure of the pressure in the pot 2.
• any suitable type of pressure gauge which can be read through the hatch or from a remote indicator may be used.
• the pot 2 In operation the pot 2 is filled with water and an instrument to be calibrated is placed in the pot.
• the hatch 3 is fitted to the pot 2 and secured by rotation of the locking collar 4 relative to the pot.
• the valve 12 is closed by clockwise rotation and the pump is operated until a desired pressure within the pot is reached, as indicated by the capillary tube 13. This value is then compared with that indicated by the instrument as seen through the hatch.

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• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Measuring Fluid Pressure (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=3697020

Family Applications (1)

Country Status (3)

Family Cites Families (2)

• 1985
  • 1985-08-09 EP EP19850904063 patent/EP0191065A1/de not_active Withdrawn
  • 1985-08-09 WO PCT/AU1985/000185 patent/WO1986001292A1/en not_active Ceased
  • 1985-08-09 JP JP60503611A patent/JPS61502981A/ja active Pending

Non-Patent Citations (1)

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