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

CaRo26 - Progress

• CaRo26 interim report - protected area

Calibration-Round-Robin CaRo26 announcement

After our previous world-wide round robin tests we will carry out the new „CaRo26“.

CaRo93:   77 apparatuses		CaRo09:   90 apparatuses		CaRo20:   41 apparatuses
CaRo96:   68 apparatuses		CaRo11: 122 apparatuses		CaRo21: 125 apparatuses
CaRo98:   63 apparatuses		CaRo13: 112 apparatuses		CaRo22:   50 apparatuses
CaRo00:   69 apparatuses		CaRo15: 131 apparatuses		CaRo23: 130 apparatuses
CaRo03:   93 apparatuses		CaRo17: 144 apparatuses		CaRo24:   65 apparatuses
CaRo05:   98 apparatuses		CaRo18:   41 apparatuses		CaRo25: 120 apparatuses
CaRo07:   77 apparatuses		CaRo19: 127 apparatuses

Goal:

Determination of the following parameters according to standardized test methods:

Pmax		maximum explosion overpressure
Kmax		product-specific constant
LEL/MEC		lower explosion limit
LOC		limiting oxygen concentration
MIE		minimum ignition energy
MIT-C		minimum ignition temperature of a dust cloud New
MIT-L		minimum ignition temperature of a dust layer New
and calibration/certification of the relevant testing equipment.

Reason:

According to international standards, safety testing equipment - such as the 20-l-apparatus, the 1-m3-vessel 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). That is why we have been carrying out the international CaRo since 1993.

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 …
EN 14034-3		Determination of the lower explosion limit LEL …
EN 14034-4		Determination of the limiting oxygen concentration LOC …
ASTM E1226		Explosibility of Dust Clouds
ASTM E1491		Minimum autoignition temperature of dust clouds
ASTM E1515		Minimum Explosible Concentration MEC of Combustible Dusts
ASTM E2019		Minimum Ignition Energy MIE of a Dust Cloud in Air
ASTM E2021		Hot-surface ignition temperature of dust layers
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 will receive a calibration-certificate from us. If results deviate significantly, we help identify and rectify any errors.

Our service:

The test dust will be selected, homogenized, packed under nitrogen and mailed by us. All test results are continuously evaluated and will be published online in a secure area exclusively for CaRo26 participants. This allows you to check your own test results in advance. Once the test period has ended, Cesana AG will carry out a detailed overall evaluation, including the calculation of standard values and the associated tolerance band. All results will then be summarized in tabular form (anonymously) and mailed to the participants along with the final certificate for each apparatus.
New  We offer the option of receiving interim certificates from us based on the results obtained (at least 10 per apparatus) in urgent cases, e.g. as part of an audit.

Software:

Participants in CaRo26 will receive a free update to the latest PC software for KSEP and MIKE

Costs:

The fee for participation depends on the number of apparatuses:

order no.		calibration of:		price in CHF
SP9141		1 apparatus		3‘020.-
SP9142		2 apparatuses		4‘590.-
SP9143		3 apparatuses		5‘690.-
SP9144		4 apparatuses		6'510.-
The prices include test dust (0.5kg/1kg per apparatus), certificate and 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 and MIE-apparatus: 1kg each
• MIT/LIT-apparatus: 0.5kg each
• 1m3-vessel: 10kg (SP9151 extra costs = CHF 3‘070.-) Pmax, Kmax, MEC/LEL
• 1m3-vessel: 15kg (SP9152 extra costs = CHF 4‘610.-) Pmax, Kmax, MEC, LOC

Schedule:

Mailing of test dust:		starting end of May 2026
Deadline for receipt of test results:		end of January 2027
Final report of CaRo26, certificates:		February 2027

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