Approved for Trade Scales
All weighing equipment in use for trade must be suitable for its
intended purpose and be sufficiently accurate. Non-automatic weighing
machines are either 'passed as fit for use for trade' by an inspector of
weights and measures (trading standards officer) or an 'approved
qualifier'. If the equipment does not bear the stamp or stickers, it
must not be used for trade purposes.
There are a number of checks to ensure scales are always working properly, and it's recommended that some form of external service is carried out dependant on use or application i.e. portable scales are more likely to require more frequent calibration than static scales.
Approved scales are sealed and use a set of approved Tolerances, typically 2 X e for a class III scale without needing adjustment, as the seals would need replaced, re calibration is usually necessary if damage has taken place and a annual calibration check covering linearity, eccentrics and repeatability with certified test weghts, as this will determine what repairs / adjustments are required.
Automatic weighing machines are not normally passed as 'fit for use for trade' but are still required to be suitable for the process and sufficiently accurate. Checks should be carried out to ensure the machine is maintained and accurate.
Scales used in the following applications require to be approved for trade
(a) Commercial transactions based on weight such as buying selling Gold, Silver,Jewelry ,Clothing ,Food,Commercial charges etc
(b) The determination of the amount of certain payments such as tolls or taxes
(c) The purposes of court proceedings and legal requirements;
(d) The weighing of patients for medical purposes
(e) Making up medicines and other medical and pharmaceutical laboratory purposes
(f) Direct sales to the public and the making up of pre-packages and the determination of price on the basis of weight
Approved for trade weighing equipment is manufacturered to an approved pattern standard issued by the country where the equipment was manufactured or the National Measurement Office in the UK. Generally scales used in retail, medical, food or gold, or payments where the value of the weight is used in the computation of a price.
Approved equipment is identified with stickers and a verifiers mark, product approval Number. All approved / Verified / Stamped scales comply with the pattern approval they were issued with, to ensure the equipment is within limits affecting zero drift, voltage variances, temperature and humidity and ensures the weighing equipment meets the legal requirements, please also ensure that the scale pattern is still in force for the time you wish to use the scales, as the approval certificate will be valid until a certain date.
All approved products we supply comply with UK NAWI (non automatic weighing instruments) directive 2016 regulations, and meet the tolerences allowed and as a second line of service we checked all scales prior to despatch with certified F1 and M1 weights and apply a sticker to prove the work is compliant with 2016 regulations , this is not universal and some companies may charge you extra .
Used Equipment should be checked prior to placing in use to ensure it still meets current legislation make,model and serial number and must be recorded by distributors in accordance with 2016 regulations - we can only advise what the law is, its up to you to comply with it.
Most of our industrial scales can also be supplied approved to order, and require initial verification by weights and measures when assembled, in this event use the contact form and we'll send you a separate quote for this work
Approved equipment are custom products and due to 2016 weights and measures regulations must be tested in accordance withe these prior to dispatch. Some features may be disabled to comply with the weights and measures act, and we recomend contacting us for assistance.
Class I and II balances i.e. finer that 1g may exhibit an additional error in the performance of the instrument due to the incremental increase in the value for gravity where calibration is carried out using external weights.
These are ordered for place of use specific for place of use (postcode). Balances with internal calibration will automatically compensate for place of use but please use a suitable carry case to protect the equipment.
The information on this page is pretty complexed and is provided as general information for customers that are needing some guidance prior to order and is not an authoritative interpretation of the law, for all matters relating to the use of approved equipment please contact your local authority trading standards service.
Last reviewed/updated: July 2016