The Norwegian Metrology Service offers calibration of weights in accuracy classes E2, F1 and F2 with masses from 1 mg to 50 kg, in accuracy classes M1, M2 and M3 with masses from 1 mg to 500 kg, and unclassified weights with masses from 1 mg to 500 kg.
Our department of National Laboratory (NL) is responsible for performing weight calibrations. All formal requirements for traceability in measurements related to accreditation or certification are fulfilled when using our calibration services.
| Accuracy class | Nominal mass | Measurement uncertainty (k = 2)
|
| E2, F1 and F2 | 1 mg – 50 kg | 1/5 of the tolerance |
| M1, M2 og M3 | 1 mg – 500 kg | 1/3 of the tolerance |
| Uklassifiserte | 1 mg – 500 kg | 1/1000 – 1/10000 of nominal mass |
The division into accuracy classes is based on OIML R 111-1, Weights of classes E1, F1, F2, M1, M1-2, M2, M2-3 and M3. This recommendation contains a tolerance table describing the maximum permissible error (± deviation from the nominal value) that weights may have. The recommendation also provides other useful information on weights.
Unclassified weights include weights that are either not classified or classified according to a standard other than OIML R 111-1. When calibrating unclassified weights, the condition of the weights is assessed in relation to the usefulness of calibration and the customer’s needs. The Norwegian Metrology Service reserves the right to refuse calibration assignments for weights that are in poor condition or deemed unsuitable for calibration.
Weight is the force a mass generates due to gravity. The unit of weight is the newton (N), but in everyday use we commonly use the unit of mass: kilogram (kg).
Mass is one of the seven fundamental physical quantities in the SI system. It is the property of matter that gives it inertia and weight. The unit of mass is the kilogram (kg).
All customers have the right to submit a complaint if they are dissatisfied with a calibration service from the Norwegian Metrology Service. Complaints may be submitted in writing or verbally, and are handled impartially and constructively.
Procedure:
Send written complaints to postmottak@justervesenet.no.
Yes. We offer calibration agreements for customers seeking predictability and efficiency. Through such an agreement, we plan calibrations in advance and schedule your equipment for fixed intervals. Delivery time and price are agreed in advance and stated in the order confirmation before work begins. For customers with several similar instruments, we can arrange batch calibration and provide discounts for efficient execution. Please contact us to discuss a customised agreement.
You can order calibration by contacting the Norwegian Metrology Service via email, telephone or our order form. We are happy to help you identify the correct service and provide practical information on how to send in your instrument.
The price depends on the type of instrument and the scope of the assignment. You can find indicative prices in the Norwegian Metrology Service’s price list.
After calibration, you will receive a calibration certificate documenting the measurement results, uncertainty and references used. The certificate also shows traceability to national or international standards and may be used for audits or quality assurance.
The calibration interval should be based on the required accuracy, frequency of use, and the consequences of potential measurement errors. Instruments used frequently, under demanding conditions, or for critical measurements should be calibrated more often than those used rarely or under stable conditions. For instruments used in commercial transactions, legal control intervals may be set by regulation. For other types of instruments, recommendations can be found in Norwegian Accreditation guidelines (e.g. NA-Dok 26a for scales) and international documents such as ILAC-G24.
We recommend assessing your specific needs and contacting us for advice on calibration intervals suited to your instruments and applications.
When you order a calibration, we first agree on the instrument type and the tests required. You then send the instrument to us, or we arrange on-site calibration if necessary. Our experts perform the calibration in accordance with international standards, and you receive a certificate showing the results, uncertainty and traceability. The instrument is then returned to you safely.
Phone:
64 84 84 84
E-mail:
postmottak@justervesenet.no
Contact form:
Fill in our contact form, and we will respond as quickly as possible.
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