National standard of the unit of the mass and volume liquid (water) flow rate
Developed and in use since 2009, approved as standard in 2015
Standard composition:
- Working table with two branches of measuring pipelines;
- Flow generators on the basis of pumps Grundfoss;
- Head tank with permanent level;
- Three weight measuring devices on the basis of balances Mettler Toledo;
- Four devices for flow switch over;
- Three standard mass flow meters Micro Motion ELITE series;
- Flowrate regulators Siemens;
- Frequency drives for pumps operation VLT 6000 HVAC;
- Automated measuring systems and automated control systems for technological process on the basis of programmable industrial controllers iCPcon (Taiwan);
- System for water preparation and change;
- System of compressed air supply;
- System for microclimate maintenance.
Metrological characteristics:
|
Nominal diameter of any type flow meters under examination DN
|
Method in use
|
Value (or value range), reproduced by the standard
|
Non-excluded systematic error, Θ
|
Random error S
|
Expanded uncertainty U (k = 2, Р = 95 %)
|
|
From DN10* to DN50 inclusive
|
Static weighing
|
From 60 000 to 7 000 incl. kg/h
|
0,028 %
|
0,014 %
|
0,029 %
|
|
From 7 000 to 10 incl. kg/h
|
0,031 %
|
0,023 %
|
0,031 %
|
|
From 10 to 1 kg/h
|
0,065 %
|
0,019 %
|
0,038 %
|
|
From DN10* to DN50 inclusive
|
Static weighing
|
From 60 to 7 incl. m3/h
|
0,044 %
|
0,014 %
|
0,044 %
|
|
From 7 to 0.1 incl. m3/h
|
0,046 %
|
0,023 %
|
0,031 %
|
|
From 0.1 to 0.001 incl. m3/h
|
0,066 %
|
0,018 %
|
0,045 %
|
* - installation of smaller nominal diameter when producing transfer with straight parts for greater diameter is possible.
Calibration and measurement capabilities in the field of measurement of mass and volume flowrate of liquid (flow) are confirmed by the results of international comparisons COOMET.M.FF-S2.
Sources of traceability:
- Belarus, BelGIM, National standard of mass unit within the range 1 mg – 1 kg NS RB15-05;
- Belarus, BelGIM, National standard of units: time - second, frequency – hertz and time scale NS RB 1-95;
- Belarus, BelGIM, National standard of the unit of temperature Kelvin NS RB 2-95;
- Belarus, BelGIM, Reference standard of the pressure unit – Pascal, in the field of absolute pressure RS RB 15-08;
- Belarus, BelGIM, Reference standard of the pressure unit IS RB 2-96;
- Germany, PTB, National standard of the unit of liquid density;
- Russia, FGUP «VNIIM D. I. Mendeleev», National primary standard of the units of molar and mass concentration of the components in gas mediums GET 154-01.
Scope:
The standard is used to reproduce and transfer of the unit of mass and volume liquid (water) flow rate within the range of mass flowrates from 1 to 60000 kg/h and volume flowrates from 0,001 to 60 m3/h to working standards and working liquid flow meters that are used in all fields of the national economy of the Republic of Belarus.
