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Primary Pressure Reference Standard

Primary pressure reference standards are used to measure and generate pressures to a high level of accuracy and repeatability for calibration purposes.

These instruments are used to ensure that the measurement uncertainty of all pressure instrumentation which are referred to the standard are kept within performance requirements.

For example water or mercury manometers which are liquid filled U tube columns, use the difference in height between columns to determine the weight (Force) of liquid. Since the diameter of the column is known the cross sectional area (Area) can be calculated and thus the pressure can be determined.

Another example is a Dead Weight Tester which uses a piston and cylinder of a known cross sectional area (Area) and weights of a known mass (Force) which are placed on top of the piston. Thus the pressure applied can be determined very accurately.

Since Primary Pressure Standards are the most accurate pressure measurement instruments available they are typically used as calibration instruments for pressure sensors and gauges.

Pressure calibration products
  • DPC Low Range Pressure Controller and Calibrator
  • Zero & Span calibration adjustable signal output pressure transducers
  • PGS40 Mid Pressure Calibration Hand Pump
  • 70,000 psi usb pressure sensor for calibration use with hydraulic screw press and PC computer

Calibration Related Terms

More pages related to calibration technical terms.

  • BSL – Best Straight Line
  • Compensated Temperature Range
  • Dead Weight Tester
  • NPL – National Physical Laboratory
  • Secondary Pressure Standard
  • Span Offset
  • Traceable Calibration
  • TSL – Terminal Straight Line
  • UKAS – The United Kingdom Accreditation Service
  • UKAS Calibration Certificate
  • Zero Offset
  • Zero Tare

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