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

Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016 2

3

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

4

Micro-Flow facility covers already 100 nl/min to 1 ml/min.

Motivation

But calibration times are long for flow rates below 1ml/min !


5

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


Milli-Flow Facility – working principle

6

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 %


Milli-Flow Facility – working principle

7

(A) syringe pump, (B) beaker on balance,

(C, D, E) pressure sensors, (F, G, H) temperature sensors,

(I) pressure security valve, (J) water reservoir


Milli-Flow Facility – homemade syringe pump

8

(A) high precision linear stage, (B) linear measuring system,

(C) syringe, (D) mounting syringe body, (E) mounting and

positioning for syringe plunger.


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

9 Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016

Flow rate determination Least square Linear Regression

10


Repeatability and Reproducibility of measurements with different syringes and water

100 ml syringe

11

10 ml syringe

Liquids other than water

12 Micro Nano 2016, Amsterdam NL, 13 – 14.12.2016

Liquids other than water

13

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


Conclusion

14

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


Thank you very much for your attention

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