1993 - 2016 realized by Adolf Kuhner AG, Birsfelden, Switzerland
for determination of the explosion characteristics of dusts

Final Report CaRo 25

The CaRo25 calibration round robin has been successfully completed.
More detailed information can be found in the Final Report CaRo25.

Calibration-Round-Robin CaRo26 announcement

Goal:

Determination of the following parameters according to standardized test methods and calibration of the corresponding test equipment:

Pmax		maximum explosion overpressure
Kmax		product-specific constant
LEL/MEC		lower explosion limit New
LOC		limiting oxygen concentration New
MIE		minimum ignition energy
MIT		minimum ignition temperature New

Reason:

According to international standards 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 must be calibrated at regular intervals (at least every 12 months or following any significant maintenance or repair). For this purpose, an international calibration round test (calibration round robin = CaRo) has been carried out periodically since 1993.

SN 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 …
EN 14034-3		Determination of the lower explosion limit LEL …
EN 14034-4		Determination of the limiting oxygen concentration LOC …
ASTM E2019		Minimum Ignition Energy MIE of a Dust Cloud in Air
ASTM E1226		Explosibility of Dust Clouds
ASTM E1515		Minimum Explosible Concentration MEC of Combustible Dusts
ASTM E2931		Limiting Oxygen Concentration LOC of Combustible 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.

The reports of the CaRo tests will be published here.

CaRo - Final Reports

• CaRo 25 Final Report
• CaRo 24 Final Report
• CaRo 23 Final Report
• CaRo 22 Final Report
• CaRo 21 Final Report
• CaRo 20 Final Report
• CaRo 19 Final Report
• CaRo 18 Final Report
• CaRo 17 Final Report
• CaRo 15 Final Report
• CaRo 13 Final Report
• CaRo 11 Final Report
• CaRo 09 Final Report
• CaRo 07 Final Report
• CaRo 05 Final Report
• CaRo 03 Final Report
• CaRo 01 Final Report
• CaRo 98 Final Report
• CaRo 96 Final Report
• CaRo 93 Final Report