MEASUREMENT
CONTROL DEVICES
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TEST FACILITIES WITH SONIC NOZZLES AND BELL PROVER
PURPOSE
Facilities are used for calibration, verification and testing of gas (air) volume and flow rates meters.

PROPERTIES
Because the velocity of air flow through a sonic nozzle is limited to the local speed of sound at the nozzle throat, we can exactly know the volumetric flow rate. When in the test facility a set of sonic nozzles with different diameters of nozzles throats is used, we get the standard gas (air) flow rates and volumes in offered values scale.
The principle of the bell type prover operation is pushing the known air volume through the meters under testing or calibration.

TECHNICAL DATA
Facilities with sonic nozzles cover flow rate ranges from 0.016 m3/h to 310 m3/h. According to client's orders laboratory is able to produce facilities covering flow ranges till 1500 m3/h. The best measurement capability is better than ± 0.20 %.
Bell prover covers flow rate ranges from 0.016 m3/h
to 16.0 m3/h. The dry air pressure at front of calibrating gas meters near atmospheric. The best measurement capability is better than ± 0.15 %.
The facilities are equipped with computer programs for control of operating and calculation of results.

THE LEVEL OF TECHNOLOGY COMPLETION
Final stage, manufacturing upon individual orders.

POSSIBLE CO-OPERATION
Search for users and foreign markets.





CONTACTS:
LITHUANIAN ENERGY INSTITUTE
Heat Equipment Research and Testing Laboratory
Breslaujos str. 3, LT-3035 Kaunas, Lithuania
Tel. +370 37 401863
Fax +370 37 351271
E-mail: testlab@isag.lei.lt