Flow meters

The Norwegian Metrology Service (Justervesenet) inspects flow meters and volume measures (tanks/containers) used in commercial transactions. These instruments must undergo conformity assessment. Typical meters include fuel dispensers, meters on tank trucks and filling stations for tank trucks, meters used in the chemical industry, and large petroleum meters, as well as milk and beer meters. During an inspection, Justervesenet normally checks the accuracy of the meters and evaluates the results against the tolerances defined in the regulations.

To ensure that a meter performs satisfactorily under normal operating conditions, it is tested when installed at its point of use and with the same medium it measures during normal operation. It is therefore important that conditions are prepared to allow inspection at the time of installation. The maximum permissible error during inspection is, for most meters, less than or equal to ±0.5%. The repeatability requirement is less than or equal to 0.2%.

Volume trucks for inspections and services

To spesialbyggede volumbiler The Norwegian Metrology Service has two specially built volume trucks. These trucks function as mobile units for verification of large fuel meters, tank trucks, and storage tank facilities. This allows us to inspect tank filling facilities efficiently and with minimal disruption for the user.

Do you need documented verification of your measuring instruments – at a time that suits you?

The Norwegian Metrology Service offers on-request verification as one of our services. As a neutral third party, we can carry out verification and in-use inspections and issue documentation. We have the equipment and expertise to help your enterprise meet the requirements for measurements.

Frequently asked questions

Which measuring instruments are subject to surveillance? 

All measuring instruments used for financial settlement in trade and industry – for example, scales, fuel dispensers, and water meters – are subject to supervision.

Does surveillance involve costs? 

Many of the Norwegian Metrology Service’s supervision areas are financed via annual fees paid by the relevant industry. Other actors will receive an invoice after supervision. You can find pricing information here.

How are summons, decisions and receipts from the Norwegian Metrology Service sent? 

In connection with supervision of measuring instruments, the Norwegian Metrology Service sends summons, decisions and receipts digitally via Altinn. This follows from the Digitalisation Circular (Digitaliseringsrundskrivet), which requires businesses to receive digital correspondence from public authorities.

How do I find correspondence from the Norwegian Metrology Service in Altinn?

Select the correct enterprise/profile when logging in to Altinn, in the top right corner.
Check that you have the role “Post/Archive” for the enterprise you represent.
Look in folders such as “Archived” and “Deleted messages” – the correspondence may have been moved.
If you still cannot find the correspondence, contact Altinn user service:
- Telephone: 75 00 60 00
- www.altinn.no

How to find letters sent before 2025 in Altinn

If you cannot find letters from the Norwegian Metrology Service (Justervesenet) that were sent before 2025, they may be located in the “old Altinn”.

Altinn user support informs us that the documents should be available to users with the correct access rights.

If you need assistance, you can contact Altinn by phone at +47 75 00 60 00, by email, or via their website.

What is verified in flow meters? 

We verify that the measurement corresponds with the actual flow and that the meter is approved for its intended use.

What must I do after a supervision? 

If nonconformities are found, you will receive guidance on what must be corrected, a deadline for remediation, and information on any fees.

What happens during a supervision? 

Supervision may involve checking the measuring instrument or the measurement process, providing information on correct use, and guidance on the regulations. After supervision, the enterprise receives a report or a decision.

Why does the Norwegian Metrology Service carry out supervision of measuring instruments? 

Supervision ensures that measuring instruments used in trade and industry provide correct and fair measurements – for the benefit of both consumers and businesses.

Flow meters

Volume trucks for inspections and services

The SI unit for volume is the cubic metre

Do you need documented verification of your measuring instruments – at a time that suits you?

Frequently asked questions