BMI Measuring Instruments Page 29
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Accuracy: Tolerance/Error Limits In the European Measuring Instruments Directive, MID, the tolerance/ error limits must be kept within certain reference conditions. This includes the temperature and traction. If a traction measurement is necessary, it is indicated on the device. The reference temperature is 20 °C, unless otherwise stated. Accuracy class Formula I II III 0,1 + 0,1 x L 0,3 + 0,2 x L 0,6 + 0,4 x L from 0 ...1 m* ± 0,2 mm ± 0,5 mm ± 1,0 mm from 1 ...2 m* ± 0,3 mm ± 0,7 mm ± 1,4 mm from 2 ...3 m* ± 0,4 mm ± 0,9 mm ± 1,8 mm from 4 ...5 m* ± 0,6 mm ± 1,3 mm ± 2,6 mm from 7 ...8 m* ± 0,9 mm ± 1,9 mm ± 3,8 mm from 9 ...10 m* ± 1,1 mm ± 2,3 mm ± 4,6 mm from 19 ...20 m* ± 2,1 mm ± 4,3 mm ± 8,6 mm from 29 ...30 m* ± 3,1 mm ± 6,3 mm ± 12,6 mm from 49 ...50 m* ± 5,1 mm ± 10,3 mm ± 20,6 mm from 99 ...100 m* ± 10,1 mm ± 20,3 mm ± 40,6 mm Length Correction/Temperature Compensation Linear expansion of long tapes Length measurements are subject to – like all phyiscal bodies – volume or length changes with a temperature increase or decrease. The tolerance/error limits apply to a reference temperature of 20 °C, unless otherwise stated. A measurement correction may be necessary for long tape measures and pocket tapes. Measurement corrections should be made when: • The ambient temperature greatly deviates from the reference temperature. • The linear expansion coefficient of the object being measured differs greatly from the tape. • A high measuring accuracy is required by the user. To calculate the length variation L: L = L x T x L = Length at the measuring point. T = Difference of the actual temperature at the time of measurement. = Linear expansion coefficient (usually printed on the end of the tape). The length can be corrected by using the temperature compensation table below. * up to ( including) length L If the end of the measuring device has an area such as a tape measure with a hook or the end of a folding rule where the measurement begins at the end of the device, the tolerance/error limit increases by: Accuracy class Value c I II III 0,1 mm 0,2 mm 0,3 mm For folding rules an additional deviation is allowed for the joints: Accuracy class Value d The temperature compensation table details how temperature effects a steel tape made of carbon steel with a linear expansion coefficient of = 1,1 x 10-5 1/ °C: Variation in length Tape length Variation in temperature T based on 20 °C ± 10 °C ± 20 °C ± 30 °C 1m ± 0,11 mm ± 0,22 mm ± 0,33 mm 2m ± 0,22 mm ± 0,44 mm ± 0,66 mm 3m ± 0,33 mm ± 0,66 mm ± 0,99 mm I II III 4m ± 0,44 mm ± 0,88 mm ± 1,32 mm –– 0,3 mm 0,5 mm 5m ± 0,55 mm ± 1,10 mm ± 1,65 mm 8m ± 0,88 mm ± 1,76 mm ± 2,64 mm 10 m ± 1,10 mm ± 2,20 mm ± 3,30 mm 20 m ± 2,20 mm ± 4,40 mm ± 6,60 mm 30 m ± 3,30 mm ± 6,60 mm ± 9,90 mm 50 m ± 5,50 mm ± 11,00 mm ± 16,50 mm 100 m ± 11,00 mm ± 22,00 mm ± 33,00 mm Example of how to use the table: The linear expansion coefficient of a tape measure made of carbon steel is approx. 1,1 x 10-5 / °C oder 0,011 mm/m °C. At an ambient temperature of 30 °C, the deviation from the reference temperature is 10 °C. A 10 m tape measure therefore lengthens by 1.1 mm so that the measurement should be corrected by -1.1 mm. Refer to our General Terms of Payment and Delivery 29
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