Flow Measurement and Calibration
Flow calibration standard at Instrument Calibration Center.
- Liquid flow meter, rotameter , turbine , vortex , magnetic etc.
- Gas flow meter , dp-cell , mass flow (Coriolis effect)
Flow Calibration Diagram (Gas-flow : Nitrogen)
Flow standard : DryCal DC-2 from BIOS
Under test : Rota-meter
Temperature : Hart Thermometer
Pressure : Druck DPI305
Flow Calculation Example
Volume flow rate (qv) Units
SI Gases: m3/hr Liquids: l/min.
IP Gases:
ft3/hr Liquids: USG/min.
Mass flow rate
(qm) Units
SI Gases:
kg/s Liquids: kg/min.
IP Gases:
lb./s Liquids: lb./min.
Determine
the flow rate of Nitrogen at standard conditions given. (NAIT Sheet at TTC Thailand)
qvf = 35 m3/s
Tf = 45°C
Pf = 400 kPag
Patm = 100 kPaa
Standard
Conditions 15°C, 101.325 kPaa
Uncertainty Calculation (For Pressure Volume Temperature and time : PVTt Method from KMUTT)
Mass of Air Change with Temperature change
Put all Uncertainty into budget
เขียนโดย Wcharnsuk @ 09:17
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Many of the principles of calibration apply equally across liquid control distributorand this guide re-iterates these principles and puts them in the context of flow calibrations. Vocabulary is important to the understanding of the principles and the key definitions of terms have been reproduced from the ‘International Vocabulary of Metrology — Basic and general concepts and associated terms’ (VIM) 2008, and this is freely available from the BIPM web site.
Thanks for sharing. Gas controller plays a crucial role in maintaining the delicate balance between energy supply and safety.
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