Flow Measurement and Calibration

Flow calibration standard at Instrument Calibration Center.

Principle
- 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