ГЭТ 95-2020 (НИО 231)
Standard name:
- ГЭТ 95-2020 State Primary Special Standard of the Unit of Pressure for Pressure Difference
Type of measurement:
- Pressure measurements, vacuum measurements
Structural division: name НИО\НИЛ:
- Research Department of State Standards in the Field of Pressure Measurements
Guardian Scientist:
- Vitkovsky Oleg Sergeevich, Ph.D.
Year of creation:
- 1975
Year of re-confirmation:
- 2020
Operating principle:
- The standard is based on a method for independently reproducing pressure differences using a set of micromanometers and piston gauges of various types with mutually overlapping measurement ranges, as well as equipment for creating and maintaining pressure.
- Micromanometer MVK: The principle of measurement of the micromanometer MVK is based on measuring the difference in pressure under the measuring bell of the micromanometer and the atmosphere using electronic scales.
- Micromanometer MKSh: Compensating micromanometer with a laser reference system MKSh is based on the principle of balancing the action of pressure by a column of liquid.
- The MGP piston pressure gauge uses the principle of dynamic interaction of a piston in a cylinder with an air flow.
Composition of the standard:
The standard consists of a set of the following technical measuring instruments and auxiliary devices:
- Weighing bell micromanometer No. 01 MVK;
- Micromanometer with laser reference system No. 01 MKSH;
- Piston pressure gauge No. 231- I MGP;
- Piston micromanometer No. 231- II MGP – a means of transmitting the unit size.
- Equipment for creating and maintaining a pressure difference and transmitting the pressure unit.
Main metrological characteristics
| Characteristic name | Name of micromanometer | ||
|---|---|---|---|
| MVK | MKS | IHL | |
| Reproducible pressure range, Pa | 0.05 – 1 102 | 1 102 – 5 103 | 5 103 – 1 105 |
| Standard deviation of the measurement result, S0, Pa, no more than | 0.025 | 0.04 | 0.2 |
| Unexcluded systematic error, Θ0, Pa, no more than | 0.025 | 0.1 | 0.4 |
| Standard uncertainty, Type A, Pa | 0.025 | 0.04 | 0.2 |
| Standard uncertainty, Type B, Pa | 0.01 | 0.06 | 0.23 |
| Total uncertainty, Pa | 0.03 | 0.07 | 0.31 |
| Expanded uncertainty, Pa (k=2) | 0.06 | 0.14 | 0.62 |
Verification diagram:
- State verification scheme for instruments measuring pressure differences up to 1 10^5 Pa (Order of Rosstandart No. 472 of March 10, 2025)
Scope of application:
Mechanical engineering, instrument making, medicine, transport, aerospace technology, fuel and energy complex, etc.
Results of applying the standard:
The standard leads the State Verification Scheme for Differential Pressure Measuring Instruments up to 1 105 Pa, approved by Rosstandart Order No. 472 of March 10, 2021.
The standard transfers its unit to national institutes in Belarus and Kazakhstan.
The total number of measuring instruments traceable to ГЭТ 95-2020:
Hundreds of thousands of SI units
Ensuring the uniformity of measurements, participation in the CIPM MRA program:
The standard participated in the Key Comparisons of National Pressure Standards in the Range of 100-5000 Pa, COOMET.M.P-K14
Participating countries: Germany (pilot country), Russia, Czech Republic, Lithuania
Russia's metrological capabilities in the differential pressure range are indicated in the SMC tables
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PHOTO:
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reference ГЭТ 95-2020