OIML Class E1, E2, F1, F2, M1, M2, M3 Calibration Weights The "OIML" Recommendations for Weights
The "Organisation International de Métrologie Légale" has defined exactly the metrological requirements for weights in the area of compulsory verification worldwide. Most countries are members of OIML. OIML Recommendation R111 (Edition 1994) refers to weights from 1mg to 50Kg. Declarations are made regarding among other aspects, accuracy, materials, geometric form, identification and preservation.
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.
Handling Accessories Weights should not be touched or handled as this will change the value and degrade the weight. Always use a handling glove or tool.
Calibration Certificates
Individual certificates of calibration are available. Prices on application. 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.
Nominal Weight
1mg 2mg 5mg
10mg 20mg 50mg
100mg 200mg 500mg 1g 2g 5g
10g 20g 50g
100g 200g 500g 1kg 2kg
E1
£60.00 £60.00 £60.00 £60.00 £60.00 £60.00 £60.00 £60.00 £60.00
£102.00 £107.00 £115.00 £120.00 £129.00 £150.00 £173.00
Price List - Calibration Weights E2
F1
£24.00 £24.00 £24.00 £24.00 £24.00 £24.00 £24.00 £24.00 £24.00 £48.50 £51.00 £55.00 £57.00 £65.00 £75.00 £80.00
£203.00 £100.00 £285.00 £168.00 £420.00 £245.00
F2
£11.85 £10.95 £11.85 £10.95 £11.85 £10.95 £11.85 £10.95 £11.85 £10.95 £11.85 £10.95 £11.85 £10.95 £11.85 £10.95 £11.85 £10.95 £22.75 £19.25 £23.65 £20.00 £25.50 £21.85 £28.25 £23.65 £30.00 £25.50 £32.75 £27.25 £36.50 £31.00
M1
£5.55 £5.55 £5.55 £5.55 £5.55 £5.55 £5.55 £5.55 £5.55 £5.55 £5.85 £6.25 £6.65 £7.00 £7.95 £9.65
M2 M3 F2 E2
E1 Weight Classifications & Materials
Weight Standards of the highest accuracy class, mostly only as Reference Standards for metrological services.
Stainless Steel
Weight Standards, the most accurate test or adjusting weights for high resolution, high precision balances I over n* = 100,000 d.
1mg to 5mg Aluminium 10mg to 500mg Nickel Silver 1g to 20Kg Stainless Steel
F1
High precision weights suitable for testing, calibrating and adjusting most high precision balances I up to approx. n* = 100,000 d.
1mg to 5mg Aluminium 10mg to 500mg Nickel Silver 1g to 20Kg Nickel Plated Brass
High precision weights suitable for very accurate precision balances II with a resolution up to approx. n* = 50,000 d.
1mg to 5mg Aluminium 10mg to 500mg Nickel Silver 1g to 20Kg Finely turned Stainless Steel
£5.15 £5.35 £5.75 £6.15 £6.55 £7.50 £9.20
£49.00 £40.00 £13.65 £12.75 £68.25 £57.50 £28.25 £26.35 £99.00 £79.00 £41.85 £40.00
£615.00 £385.00 £146.35 £120.00 £72.75 £65.50
5kg £1,025.00 £550.00 £253.65 £208.25 £56.35 £53.65 £51.85 10kg £1,472.00 £855.00 £471.85 £385.50 £74.50 £71.85 £80.00 20kg £2,275.00 £1,528.00 £1,182.85 £609.25 £103.65 £101.85
Price List - Handling Accessories Model No. Weight Size UF-100
UF-105 UF-205
UWF-2 UWF-5 UD-10
UHG-1
for weights 1mg to 200g for weights 1mg to 50g for weights 100g to 1kg
for 2kg Weights for 5kg Weights for 10kg Weights
Class F2
E1 E1 2 E2 Description M1 M2 E F1 F1 100mm Stainless Steel Forceps
Price £6.25
105mm Stainless Steel Forceps £13.65 250mm Stainless Steel Forceps £24.75
E1 E1 E1 White cotton/lint handling glove E2 E2 E2 F1 F1 F1 F2 F2 F2
Weight Forks Weight Forks
Gripping Device Handling Glove
@
sales@atp-instruments.co.uk
£48.00 £52.00 £78.00
£1.95
Classes of Accuracy OIML E1
Nominal Weight Tolerance mg
E2
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.
1mg to 5mg Aluminium 10mg to 500mg Nickel Silver 1g to 20Kg Finely turned Brass
M2
Precision weights for testing, calibrating and adjusting trade balances III and IV with a resolution of less than n* 5,000 d.
1g to 2Kg Finely turned Brass 5Kg to 20Kg Cast Iron
M3
Trade weights for everyday use with mechanical platform scales, decimal balances etc.
1g to 2Kg Brass 5Kg to 20Kg Cast Iron
F1
F2
M1
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
2 g ±0.012 ±0.04 ±0.12 ±0.4 5 g ±0.015 ±0.05 ±0.15 ±0.5 10 g ±0.02 ±0.06 ±0.2
100 g ±0.05 ±0.15 ±0.5 200 g ±0.1
500 g ±0.25 ±0.75 ±2.5 1 Kg ±0.5 2 Kg ±1 5 Kg ±2.5 10 Kg ±5 20 Kg ±10
±1.5 ±5 ±3
±0.3 ±1 ±3 ±1.2 ±4 ±1.5 ±5
20 g ±0.025 ±0.08 ±0.25 ±0.8 50 g ±0.03 ±0.1
±0.3 ±1 ±3 ±10 ±30 ±7.5 ±25 ±75
±0.6 ±2 ±6 ±2.5 ±8
±0.3 ±1 ±3 ±1.5 ±5
±10 ±15
±10 ±30
±7.5 ±25 ±75 ±15
±50 ±150 ±100 ±300
±250 ±750 ±2500
±15 ±50 ±150 ±500 ±1500 ±5000 ±30 ±100 ±300 ±1000 ±3000 ±10000
@
technical@atp-instruments.co.uk 59
M2
M3
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