Automatic weighing instruments

Automatic weighing instruments are tested according to international OIML recommendations. National Swedish type approvals and international OIML-certificates are issued by SP for all types of automatic weighing instruments.

Today, the harmonising legislation in Europe for non-automatic weighing instruments has no equivalent in this area. However, all countries who are members of WELMEC (European cooperation in legal metrology) have agreed on accepting conformity with an OIML recommendation as the basis for a national type approval with little or no further examination where the instrument has already been granted approval in another signatory country.

According to WELMEC 4 (issue 2) March 1997, eighteen countries have signed the agreement. This means that a type approval from SP makes it easy to obtain national approvals for automatic weighing instruments in most European countries.

The relevant OIML recommendations are listed here:

  • OIML R 50 "Continuous totalizing automatic weighing instruments",
    belt weighers
  • OIML R 51 "Automatic catchweighing instruments (catchweighers)",
    checkweighers, weigh price labellers, wheel loader scales etc.
  • OIML R 61 "Automatic gravimetric filling instruments"
  • OIML R 106 "Automatic rail-weigh bridges"
  • OIML R 107 "Automatic discontinuous filling instruments",
    hopper weighers

SP also performs tests and issues national Swedish type approvals based on the second draft of the OIML recommendation for "Automatic instruments for weighing road vehicles in motion".


Related Information

Business Areas

RISE Safety and Transport

Contact Persons

Bengt Gutfelt

Phone: +46 10 516 54 76

RISE Research Institutes of Sweden, Phone 010-516 50 00, E-mail

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