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| Quantity - Volume flow - volume of
liquid passing through the meter divided by the time
unit. Mass flow - mass of liquid passing through the meter divided by the time unit. Delivered mass or volume. |
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| Unit - m3/h, l/h, l/min
(volume flow); kg/h, kg/min (mass flow). |
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| Tasks of the laboratory | |||||||||||||||||||||||
| The main task of the
Laboratory is realisation of volume flow, mass flow,
delivered mass and volume units for gas, calibration of
flow meters and volume meters. |
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| International comparisons | |||||||||||||||||||||||
| The SMU flow
standards are regulary compared to secondary standards of
authorized bodies in Germany, Switzerland and in the
other western countries. Transfer standards - a set of
critical nozzles is traceable to the primary standard of
the PTB, Braunschweig, Germany. |
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Available metrological services | ||||||||||||||||||||||
| Calibration
of gas flow volume and flowrate standards of 1. and 2.
orders (with a measurement range from 0.001 m3/h
to 400 m3/h). Calibration and verification of
gasmeters working with volumetric principle, of gas
flowrmeters (with a mearument range from 0.001 m3/h
to 400 m3/h). Calibration and verification of
gasmeters by nozles sonical (with a measurement range
from 0.01 m3/h to 270 m3/h).
Expanded uncertainty (k=2) for these given services is
0.2 %. Calibration and verification of conversion devices for gas (with a measurement range from 0.1 MPa to 6 MPa and (-20)°C to 60°C, expanded uncertainty (k=2) is 0.5 %. |
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| Methods of measurement: | |||||||||||||||||||||||
| - the calibration of standards and verification of ordinary instruments is performed in accordance with the National legislative and the OIML reccomendations. The verification is performed at standard devices of the SMU by a method of direct traceability or by reference standards. | |||||||||||||||||||||||
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Instuments in use | ||||||||||||||||||||||
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For a verification of standards of 1. and 2. orders and for pattern testing the primary standards are used as follows: equivalent volume of discharged liquid with a measurement range from (0.01 up to 3) m3/h and with a total uncertainty of 0.1 % of RDG Bell volume meter - with a measurement range from (1 up to 65) m3/h; a standard drum-type gas meter with a range up to 16 m3/h (a total uncertainty is 0.15 % of RDG); for pattern testing of gas meters rotary gas meters with a range of measurement up to 40 m3/h and 400 m3/h, resp. sets of critical nozzles are used; set of nozzles (0.06 to 63) m3/h - transfer standard, expanded uncertainty is 0.21% (kU=2). | ||||||||||||||||||||||
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