OIML Calibration Weights

ATP Instrumentation offers a full range of OIML Class E1, E2, F1, F2, M1, M2, M3 Calibration Weights

ATP also provides calibration services for a wide variety of of its test equipment.

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Classes of Accuracy, E1 to M1
The classes of accuracy are graded in strictly hierarchical fashion in a ratio of 1:3, where E1 is the most accurate and M3 being the least accurate class of weights. When checking weights among themselves the next highest class is always the correct class for control.

Test Weights (Standard)
When a Company is certified for Quality Assurance to ISO 9001 - 9003 it accepts the obligation, in respect of control of measuring equipment, to periodically test or have all of its measuring instruments tested. This testing must be documented.
Correspondingly, this applies equally to Good Laboratory Practice (GLP) and Test Laboratories to EN 45001.

Calibration Certificates
Individual certificates of calibration are available. Prices on application.


Weight Classifications

E1 Weight Standards of the highest accuracy class, mostly only as Reference Standards for metrological services.

E2 Weight Standards, the most accurate test or adjusting weights for high resolution, high precision balances I over n* = 100,000 d.

F1 High precision weights suitable for testing, calibrating and adjusting most high precision balances I up to approx. n* = 100,000 d.

F2 High precision weights suitable for very accurate precision balances II with a resolution up to approx. n* = 50,000 d.

M1 Precision weights for precision balances II and trade balances III up to n* = 10,000 d. For weighing with mechanical gold and carat balances.

M2
Precision weights for testing, calibrating and adjusting trade balances III and IV with a resolution of less than n* 5,000 d.

M3
Trade weights for everyday use with mechanical platform scales, decimal balances, etc.

Prices include the following: -
E1 and 20Kg weights are supplied in a wooden box.
E2, F1, F2, M1 and M2 weights are supplied in a cushioned plastic box.
M3 weights are not supplied in a box

Weight Sets:
Customised weight sets of 7 or more boxed weights can be quoted for. Please apply for a quotation clearly stating the class & nominal value of the weights you require

To order weights the product code is made up of 2 parts
First the Class. Second the Nominal Value. Example: -
E1-50mg Equates to: - E1 Class, 50mg Nominal Value
M1-10kg Equates to: - M1 Class, 10Kg Nominal Value

Handling Accessories - See Related Products below
Weights should not be touched or handled as this will change the value and degrade the weight. Always use a handling glove or tool.

Classes of Accuracy OIML
Nominal
Weight		E1	E2	F1 	F2	M1	M2	M3
	 	     Mg   T   O   L   E   R   A   N   C   E  
1 mg		±0.002	±0.006	±0.02	±0.06	±0.2
2 mg		±0.002	±0.006	±0.02	±0.06	±0.2
5 mg		±0.002	±0.006	±0.02	±0.06	±0.2
10 mg		±0.002	±0.008	±0.025	±0.08	±0.25
20 mg		±0.003	±0.01	±0.03	±0.1	±0.3
50 mg		±0.004	±0.012	±0.04	±0.12	±0.4
100 mg		±0.005	±0.015	±0.05	±0.15	±0.5
200 mg		±0.006	±0.02	±0.06	±0.2	±0.6
500 mg		±0.008	±0.025	±0.08	±0.25	±0.8
1 g		±0.01	±0.03	±0.1	±0.3	±1	±3
2 g		±0.012	±0.04	±0.12	±0.4	±1.2	±4
5 g		±0.015	±0.05	±0.15	±0.5	±1.5	±5
10 g		±0.02	±0.06	±0.2	±0.6	±2	±6
20 g		±0.025	±0.08	±0.25	±0.8	±2.5	±8
50 g		±0.03	±0.1	±0.3	±1	±3	±10
100 g		±0.05	±0.15	±0.5	±1.5	±5	±15
200 g		±0.1	±0.3	±1	±3	±10	±30
500 g		±0.25	±0.75	±2.5	±7.5	±25	±75
1 Kg		±0.5	±1.5	±5	±15	±50	±150
2 Kg		±1	±3	±10	±30	±100	±300
5 Kg		±2.5	±7.5	±25	±75	±250	±750	±2500
10 Kg		±5	±15	±50	±150	±500	±1500	±5000
20 Kg		±10	±30	±100	±300	±1000	±3000	±10000