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TOOLS & INSTRUMENTS

# Gravimetric Standard for Liquid Micro-Flow

The dynamic gravimetric standard is used to calibrate micro-flow meters and to conduct research on new flow sensors.  This micro-flow standard measures mass flows *dm*/*dt* of water from 0.16 μg/s to 16 mg/s with uncertainty of 0.1 μg/s +0.002×*dm*/*dt* [μg/s], at a 95 % confidence level. The standard has been validated by informal comparisons with the national metrology institutes of Switzerland and Denmark.  NIST’s micro-flow standard uses either an elevated reservoir or a syringe pump to generate the flow that passes through a meter under test and it is then collected in beaker resting on a (6 g full scale) micro-balance that weighs the beaker every 0.4 s.  The time-rate-of-change of the buoyancy-corrected weight gives the mass flow.  The water flows from the meter under test into a glass pipette that passes through the free surface of the collected water.  Evaporation of water from the collection beaker is retarded by covering the free surface with a low-vapor-pressure oil layer.

Flow metrology and rheology

## Organizations

                          - NIST Headquarters
                            - Laboratory Programs
                              - Physical Measurement Laboratory
                                - Sensor Science Division
                                  - Fluid Metrology Group

## Details

## Related Publications

Micro-Flow Calibration Facility at NIST

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