Calibration-Round-Robin CaRo (since 1993)

1993 - 2016 realized by Adolf Kuhner AG, Birsfelden, Switzerland

for determination of the explosion characteristics of dusts

Final Report CaRo 19

The Calibration-Round-Robin CaRo 19 has now been successfully completed.
More detailed information can be found in the Final Report CaRo 19.

Calibration-Round-Robin CaRo19 announcement

After our previous world-wide round robin tests

CaRo93: 77 apparatuses CaRo05:   98 apparatuses CaRo15: 131 apparatuses
CaRo96: 68 apparatuses CaRo07:   77 apparatuses CaRo17: 144 apparatuses
CaRo98: 63 apparatuses CaRo09:   90 apparatuses CaRo18:   41 apparatuses
CaRo00: 69 apparatuses CaRo11: 122 apparatuses
CaRo03: 93 apparatuses CaRo13: 112 apparatuses

we will carry out on schedule the new calibration round robin "CaRo19".


Determination of the explosion characteristics using standard test methods:

  • Pmax maximum explosion overpressure
  • Kmax product-specific constant
  • MIE minimum ignition energy
  • and calibration of the relevant test apparatus.


According to international standards, test equipment must be calibrated regularly by comparison with a standard or calibrated testing apparatus. This calibration also applies to the 20-l-apparatus and the 1-m3-vessel for the determination of Pmax and Kmax and the apparatus for determination of the minimum ignition energy. The test procedure is an important part of this calibration. A general check at the component level is incomplete and hence inadmissible. Unfortunately there are neither internationally recognized reference samples nor reference equipment available for the determination of these explosion characteristics. Therefore, a calibration round robin test (CaRo) is carried out every year.

  • EN 13821: Determination of minimum ignition energy of dust/air mixtures
  • EN 14034-1: Determination of max. explosion pressure Pmax …
  • EN 14034-2: Determination of max. rate of explosion pressure rise (dp/dt)max …
  • ASTM E1226: Standard Test Method for Explosibility of Dust Clouds
  • EN ISO/IEC 80079-20-2: … Material characteristics. Combustible dust methods

Calibration method:

The mean values of the explosion indices, measured by the participating laboratories, will be calculated as reference values. All apparatuses, with results lying within the given tolerance range, meet the calibration requirements and will receive a calibration-certificate from us. Based on experience with previous round robin tests, we are certain that we will be able to discover and rectify the cause of any errors with installations producing results deviating significantly from the reference values.

Our service:

The test dust will be selected, homogenized, packed under nitrogen and mailed by us. Additionally, you will be provided with preliminary reference-results for the CaRo19 (20-l-apparatus and MIKE 3 minimum ignition energy apparatus). This allows you to pre-check your own test results. All test results are continually evaluated and will be published in the internet in a protected area exclusively for CaRo19 participants. On elapse of the test deadline, Cesana AG will make a detailed overall evaluation with calculation of the standard values and the associated tolerance range. Those apparatuses which meet the calibration requirements will receive a certificate. All results will then be summarized in tabular form (anonymously) and mailed to the participants.


CaRo19 Participants will get a free upgrade to software KSEP 7.1 and MIKE 3.5


The fee for participation depends on the number of apparatuses:

order no. calibration of: price in CHF price in EUR
SP9001 1 apparatus 2‘284.- 2‘030.-
SP9002 2 apparatuses 3‘480.- 3‘090.-
SP9003 3 apparatuses 4‘320.- 3‘840.-
The price includes packaging, but not the delivery-, customs- and VAT charges (value added tax).

Test dust:

The amount of test dust depends on the type of apparatus:

  • 20-l-apparatus, MIE-apparatus: 1kg each
  • 1m3-vessel: 10kg (SP9011 extra costs = CHF 2‘330.- / EUR 2‘070.-)


Mailing of test dust: starting mid-March 2019
Deadline for receipt of test results: end of November 2019
Final report of CaRo19, certificates: December 2019

The reports of the CaRo tests will be published here.

CaRo - Final Reports

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Realization and Distribution