Editing Pressure measurement (section)

==Calibration and standards==
[[File:Dead weight tester, Type PD23, Nagano Keiki Co., Ltd. - National Museum of Nature and Science, Tokyo - DSC07787.JPG|thumb|Dead-weight tester. This uses known calibrated weights on a piston to generate a known pressure.]]

The American Society of Mechanical Engineers (ASME) has developed two separate and distinct standards on pressure measurement, B40.100 and PTC 19.2. B40.100 provides guidelines on Pressure Indicated Dial Type and Pressure Digital Indicating Gauges, Diaphragm Seals, Snubbers, and Pressure Limiter Valves. PTC 19.2 provides instructions and guidance for the accurate determination of pressure values in support of the ASME Performance Test Codes. The choice of method, instruments, required calculations, and corrections to be applied depends on the purpose of the measurement, the allowable uncertainty, and the characteristics of the equipment being tested.

The methods for pressure measurement and the protocols used for data transmission are also provided. Guidance is given for setting up the instrumentation and determining the uncertainty of the measurement. Information regarding the instrument type, design, applicable pressure range, accuracy, output, and relative cost is provided. Information is also provided on pressure-measuring devices that are used in field environments i.e., piston gauges, manometers, and low-absolute-pressure (vacuum) instruments.

These methods are designed to assist in the evaluation of measurement uncertainty based on current technology and engineering knowledge, taking into account published instrumentation specifications and measurement and application techniques. This Supplement provides guidance in the use of methods to establish the pressure-measurement uncertainty.

===European (CEN) Standard===
* EN 472 : Pressure gauge - Vocabulary.
* EN 837-1 : Pressure gauges. Bourdon tube pressure gauges. Dimensions, metrology, requirements and testing.
* EN 837-2 : Pressure gauges. Selection and installation recommendations for pressure gauges.
* EN 837-3 : Pressure gauges. Diaphragm and capsule pressure gauges. Dimensions, metrology, requirements, and testing.

===US [[ASME]] Standards===
* B40.100-2013: Pressure gauges and Gauge attachments.
* PTC 19.2-2010 : The Performance test code for pressure measurement.