Recent Innovations in the field of traceable calibration ... · Recent Innovations in the field of...
Transcript of Recent Innovations in the field of traceable calibration ... · Recent Innovations in the field of...
Recent Innovations in the field of traceable calibration of liquid
milli-flow rates with liquids other than water
Hugo Bissig, Martin Tschannen, Marc de Huu
Agenda
1. Motivation
2. Milli-Flow Facility
3. Liquids other than water
4. Conclusion
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Motivation
Accuracy: ± 5 %
Benefits of internationally
traceable calibrations
High-end
calibration lab
0.05 %
0.10 - 0.15 %
0.15 - 0.30 %
~ 1 %
2 ~ 5 %
Less
Un
ce
rtain
ty
More
NMI
Primary reference values
End-User
International traceability
Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016
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Micro-Flow facility covers already 100 nl/min to 1 ml/min.
Motivation
But calibration times are long for flow rates below 1ml/min !
Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016
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Micro-Flow and Milli-Flow Facilities
Motivation
Accurate and fast calibration method
for flow rates from 100 nl/min to 400 ml/min !
Water
Liquids
Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016
Milli-Flow Facility – working principle
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Gravimetric and volumetric standard
Flow rate range: 0.2 ml/min – 400 ml/min
Pressure range: 0 bar – 8 bar (upstream DUT)
Temperature: 22 °C (ambient)
Uncertainties: 0.07 %
Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016
Milli-Flow Facility – working principle
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(A) syringe pump, (B) beaker on balance,
(C, D, E) pressure sensors, (F, G, H) temperature sensors,
(I) pressure security valve, (J) water reservoir
Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016
Milli-Flow Facility – homemade syringe pump
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(A) high precision linear stage, (B) linear measuring system,
(C) syringe, (D) mounting syringe body, (E) mounting and
positioning for syringe plunger.
Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016
Milli-Flow Facility– control of evaporation rate
(A) outlet needle, (B) beaker with cover, (C) glass filter,
(D) water in evaporation trap, (E) mount for T and rH sensor,
(F) balance, (G) tubing for humidity exchanger
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Flow rate determination Least square Linear Regression
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Repeatability and Reproducibility of measurements with different syringes and water
100 ml syringe
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10 ml syringe
Liquids other than water
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Liquids other than water
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The flow rate range of the milli-flow facility is limited by:
• pressure drop at the DUT
• liquid properties (viscosity)
Advantages
use any liquid
faster calibration procedure
Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016
Conclusion
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Syringe Pump Micro-Flow Milli-Flow
Flow rates: 100 nl/min – 5 ml/min 0.2 ml/min – 400 ml/min
Pressure range
(upstream DUT):
0 – 8 bar (2.5 bar) 0 – 8 bar
Temperature: 22 °C (ambient) 22 °C (ambient)
Uncertainty (k=2): 0.70 % – 0.15 % 0.07 %
portable flow generator
any liquid
Capability
to calibrate
Method
Flow
sensors
or
Flow
generators
Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016
Thank you very much for your attention