Non Automatic Weighing Instruments Instruction

Non Automatic Weighing Instruments (NAWI’s), (weighing instruments that require the action of gravity to determine the mass and require the intervention of an operator during weighing), which are first placed on the EU market and put into use in EU member states must comply with the Non-Automatic Weighing Instrument Instruction 90/384/EEC as amended by Instruction 93/68/EEC. whatever their intended use.

In the UK the Instruction has been implemented through the Non-Automatic Weighing Instrument Regulations 2000 (SI 2000/323). Other member states have their own implementation legislation.  

BSI has been involved with the NAWI Instruction since its implementation in 1993. It was the first UK assessment body to become a Notified Body for the purposes of NAWI Instruction quality system assessment. We have built up considerable knowledge on the implementation and application of the Instruction.

We can provide further information on the type examination requirements and routes, compliance requirements and assessment procedures, and NAWI quality system requirements, NAWI quality system assessment, application and approval process and quotations.

For some instruments e.g. kitchen or bathroom scales for personal use at home, the requirements are simple, only the manufacturers name and the weighing capacity need be marked on the instrument.

For other instruments e.g. retail and industrial weighing machines, supermarket checkout weighing systems, weighbridges, laboratory and pharmaceutical balances, medical weighing machines, intended to be first placed on the EU market and used for other purposes: i.e. commercial transactions; calculations of a toll, tariff, tax, bonus, penalty, remuneration, indemnity, or similar type of payment; determination of mass for the application of laws or regulations and expert opinion given in court proceedings; determination of mass in the practice of medicine for weighing patients for the purposes of monitoring, diagnosis and medical treatment; determination of mass for making up medicines on prescription in a pharmacy and determination of mass in analyses carried out in medical and pharmaceutical laboratories; determination of price on the basis of mass for the purposes of direct sales to the public and the making-up of pre-packages;

The requirements are considerably greater:

NAWI’s must have gone through EC type-examination (the procedure whereby a NAWI notified body verifies and certifies that an instrument, representative of the production envisaged, meets the requirements of the Instruction that apply to it) and been given an EC Type Approval Certificate.

NAWI’s must be manufactured in accordance with the EC Type Approval Certificate and correctly labelled and CE marked in accordance with the NAWI Instruction and other applicable instructions.

NAWI’s must be subject to initial compliance assessment procedures whereby either:  

  • A NAWI notified body examines and tests the instrument and applies the compliance assessment mark or
  • A manufacturer who has in place a quality system which has been approved by a NAWI notified body (e.g. BSI  as complying with the Instruction gives his own EC Declaration of Type Conformity and applies the compliance assessment mark.

NAWI’s after being placed on the market and put into use are subject to member state compliance re-assessment procedures following repair.