EUROMET Project 692

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EUROMET Project 692
Volume calibration of a 100 ml Gay-Lussac
Pycnometer
Portuguese Institute for uality
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Run in parallel and in close co-operation
EUROMET Project 691
Calibration Inter-comparison of a 5-litre volume
glass standard
SP - Swedish Testing and Research Institute
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EUROMET Project 691 and 692
Projects purpose

• Compare experimental methods

• Compare uncertainties calculation in the
  calibration of the pycnometer and flask

• Will be representative for all type of laboratory
  glassware

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EUROMET Project 691 and 692
Projects Details
The instruments
100 ml Pycnometer
5 litre Flask
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EUROMET Project 691 and 692
Projects Details
The instruments

• Easy handling

• Easy to see air bubbles

• Easy to clean

• The volume can not be changed without breaking it

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EUROMET Project 691 and 692
The suggest method

• Gravimetry

• Volume calculation formula for a temperature of
  20ºC

• Perform 10 measurements

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EUROMET Project 691 and 692
Results and uncertainty

• A spreadsheet will be supplied

• The uncertainty budget according to GUM

• Discussion of results and uncertainty components

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EUROMET Project 691 and 692
Preliminary results for the Pycnometer
/-0,01
Mean
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EUROMET Project 691 and 692
Time Table
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EUROMET Project 691 and 692
Transportation

• The transportation of the instruments are done
  simultaneously

• The carnet is paid by the pilot lab

• Each laboratory are requested to take care of the
  transportation to the next one

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EUROMET Project 691 and 692
Problems
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EUROMET Project 691 and 692
Resolution

• A new pycnometer was sent as soon as the damage
  occurred

• Find and Correct the difference found due to the
  damage, if needed, at the end of the measurements

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EUROMET Project 691 and 692
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EUROMET Project 691 and 692
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The coming key comparison

• At least 2 volume standards.

• In discussion a 100 ml pycnometer.

• Tested a 20-l vessel for delivered volume
• in the state of cloning organised by CENAM in
  Mexico.

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Key Comparison Project
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Key Comparison Project
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Key Comparison Project
20-l volume standard
? 0,0057
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Key Comparison Project