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Title: Primary Standards For Liquid Flow Rates From 2 mg/h To 1000 g/h
Author: Peter Lucas Harm Tido Pette Erik Smits
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: Micro and nanoflow rate calibrations are important in several applications such as liquid chromatography, (scaled down) process technology and health care for special applications. However, international traceability for micro and nanoflow rates is not properly taken care of. Therefore, the EMRP project Metrology for drug delivery (MeDD) was started in 2012 to develop and validate several primary standards for micro and nanoflow rates. The development focused on extending the flow rate down to nanoflow rates 1 mg/h, whereas the validation focused on validating primary standards in range of 600 g/h down to 1 mg/h. In this paper the two primary standards of VSL are discussed. One conventiona l primary standard based on the gravimetric method to cover flow rates from ( 0.25 to 1 5 00 ) g/h (uncertainty ranging from 0.1% to 0 .3%) and one less conventional standard based on volume expansion to cover flow rates from ( 2 to 100 ) mg/h (uncertainty around 2.5%) . Also the results of a near complete intercomparison (EURAMET project 1291) are discussed

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