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Everything You Need to Know About Primary Reference Pressure Standard

Everything You Need to Know About Primary Reference Pressure Standard

In the science of measurement, a standard is an object, system, or experiment with a defined relationship to a unit of measure of a physical quantity. These standards are the essential reference against which all other devices are compared. In pressure calibration, many terms are interchangeably used. One of them is the primary reference pressure standard.


What is the Primary Reference Standard?

Primary reference standard It is the primary instrument used as a reference to measure pressure in a standard way. The instruments are deadweight testers, pressure balances, and piston gauges. These are all traceable to SI units. Using any device is essential to a fully equipped pressure calibration lab.


Instruments Used for Pressure Reference

These instruments provide a pressure reference to compare the reading of a device under test during a calibration. A pressure transducer may measure a process pressure accurately or test and calibrate instruments on a production line.

These instruments require a more accurate calibration involving a primary reference standard to ensure consistent and precise measurement.

A reference standard must be as accurate as possible to ensure these field pressure devices meet their accuracy requirement for a specified interval.


Instruments Used for Pressure Reference

The measurements of indicators, handhelds, and other instruments used to calibrate pressure sensors in the field should be traced back to SI units.

This unbroken chain of traceability is achieved through the measurements of primary reference standards. These standards’ measurements are directly traceable to SI through the National Metrology Institute (NMI).

Traceability to SI is achieved because these instruments use the primary units, kilogram (kg), meter (m), and second (s), to realize their measurements of pressure. More accurate devices are used to calibrate each successive instrument along this traceability chain. All are ultimately traceable to SI.


Repeatability with Reference Standards

Another critical aspect of calibration is repeatability. Since these primary reference pressure standards use mass in a gravitational field and a dimensionally stable piston and cylinder system to measure and produce pressure, it’s essential in their operation that they are consistent and repeatable in all environmental conditions.

Primary standards provide uniformity to calibration that guarantees repeatability and contributes to the desired quality and accuracy to meet each requirement.

From piston gauge to primary reference pressure standard, providing consistent and reliable readings that meet your accuracy requirements is essential in pressure calibration.


SRP Control Systems Can Help

If you are still unsure about the standards you need for your lab, we can help. SRP control systems can help you care for your equipment with one of the largest pressure laboratories in Canada. We are an ISO 17025-accredited laboratory and can calibrate your equipment to meet your needs. There will be no surprises, and your instruments and equipment will be accurate and compliant.

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