ГЭТ 131-2023 (НИО 231)

Standard name:

ГЭТ 131-2023 State primary special standard of the unit of pressure for the area of variable pressure in the range from 5·10[^8] to 10 Pa, durations from 5·10[^-6] to 10 s and frequencies from 5·10[^-2] to 1·10[^4] Hz at constant pressure up to 8·10[^6] Pa

Type of measurement:

Pressure measurement, vacuum measurements

Structural division: name НИО\НИЛ:

Research Department of State Standards in the Field of Pressure Measurements

Guardian Scientist:

Firsanov Nikita Alexandrovich

Year of creation:

1981

Year of re-confirmation:

2023

Operating principle:

The standard includes setups that reproduce variable pressure, based on the following methods:
- Liquid pressure jump in a chamber with a quick-acting valve;
- Shock wave for a gas medium in a shock tube;
- Liquid pressure jump in a chamber with a falling weight;
- Reciprocity in a small closed chamber;
- Liquid pressure pulsations in a chamber with a piezoelectric piston drive;
- Piston movement in a closed chamber.

Composition of the standard:

ГЭТ 131-2023 consists of a set of the following measuring instruments:

Reference installation for reproducing variable pressure in liquid UGPD-14 in the range from 1·10[^2] to 1·10[^4] Pa, frequencies from 5·10[^-1] to 1·10[^3] Hz;
Reference installation for reproducing variable pressure in liquid DPE-03 in the range from 8·10[^3] to 1·10[^6] Pa, frequencies from 5·10[^-2] to 1·10[^4] Hz;
Standard installation for reproducing variable pressure in liquid BK-7 in the range from 1·10[^4] to 3·10[^7] Pa, durations from 3·10[^-3] to 10 s;
Reference setup for reproducing variable pressure in liquid 6909 in the range from 2.5 x 10[^6] to 5 x 10[^8] Pa, durations from 5 x 10[^-3] to 1 x 10[^-2] s;
A standard installation for reproducing variable pressure in gas UUT-9 in the range from 1·10[^5] to 1·10[^6] Pa, durations from 5·10[^-6] to 2·10[^-5] s;
Reference installation for reproducing variable pressures in liquids 6904A1 in the range from 1·10[^6] to 3·10[^7] Pa;
Reference installation for reproducing variable pressures in liquid 6906 in the range from 2·10[^7] to 5·10[^8] Pa;
A set of equipment for transmitting a pressure unit for a variable pressure region;
A complex of auxiliary devices and special engineering structures.

Main metrological characteristics

Characteristic name	Characteristic value
Pulse pressure amplitude range	from 1 x 10⁴ to 5 x 10⁸ Pa
Harmonic pressure amplitude range	from 1 10² to 1 10⁶ Pa
Amplitude range of variable pressures	from 1 x 10⁶ to 5 x 10⁸ Pa
Harmonic pressure frequency range	from 5 10^-2 to 1 10⁴ Hz
Range of alternating pressure durations	from 5 10^-6 to 10 s
Standard deviation of the measurement result (based on 11 independent measurements), S₀, %	from 0.1 to 0.5
Unexcluded systematic error, ϴ₀, no more than, %	1.4
Relative standard uncertainty of Type A (based on 11 independent measurements), u_0A, %	from 0.1 to 0.5
Relative standard uncertainty, type B, u_0B, no more than, %	0.6
Total standard uncertainty, u_0C, no more than, %	0.8
Expanded uncertainty U₀ (k = 2), no more than, %	1.6

Verification diagram:

"State Verification Scheme for Variable Pressure Measuring Instruments," approved by Order No. 2417 of the Federal Agency for Technical Regulation and Metrology dated November 21, 2023

Scope of application:

Hydrophysical research; space and defense technologies;
instrument making and precision engineering;
shipbuilding, aircraft and rocket engineering;
energy and oil and gas industries, etc.

Results of applying the standard:

Measurements performed on the improved standard are harmonized with modern international practice and meet modern requirements for accuracy and the range of reproduction and transfer of units. The standard implements all functions related to maintaining the uniformity of measurements in the country in accordance with global metrological standards: verification and calibration of measuring instruments, testing and certification of instrument-making products. Comparisons are also possible.

Total number of measuring instruments traceable to ГЭТ 131-2023::

several thousand

Ensuring the uniformity of measurements, participation in the CIPM MRA program:

The search for possibilities for comparing standards reproducing dynamic quantities is being developed by the advisory committee

Unique technical installations as part of the standard:

none

PHOTO:

Information in the Federal State Information System "ARSHIN"