Standard Platinum Resistance Thermometers (SPRT) and thermocouples, types S and R.
–189.3442 °C to 660.323 °C
–190 °C to 0 °C: triple points of argon, mercury and water
–190 °C to 420 °C: triple points of argon, mercury, water; freezing points of tin and zinc
–190 °C to 660 °C: triple points of argon, mercury, water; freezing points of tin, zinc and aluminium
–39 °C to 30 °C: triple points of mercury and water; melting point of gallium
0 °C to 30 °C: triple point of water and melting point of gallium
0 °C to 157 °C: triple point of water and freezing point of indium
0 °C to 232 °C: triple point of water; freezing points of indium and tin
0 °C to 420 °C: triple point of water; freezing points of tin and zinc
0 °C to 660 °C: triple point of water; freezing points of tin, zinc and aluminium
The measurement uncertainty depends on the thermometer being calibrated. Uncertainty is expressed as an interval which, assuming a normal distribution, corresponds to a confidence level of approximately 95% (k = 2).
Calibration is performed by determining the thermometer resistance R(t) at the respective fixed points by comparison with the laboratory’s reference resistors. The thermometer’s W-values at the fixed points are stated in the calibration certificate and are used to calculate the constants of the interpolation formula.
W is defined as:
W = R(t) / R(0.01 °C)
230 °C to 1100 °C: freezing points of tin, zinc, aluminium, silver and copper
230 °C to 962 °C: freezing points of tin, zinc, aluminium and silver
230 °C to 660 °C: freezing points of tin, zinc and aluminium
230 °C to 420 °C: freezing points of tin and zinc
Typical measurement uncertainty for a Type S thermocouple (Pt–Pt/10%Rh) is 0.2 °C to 0.3 °C (2 standard deviations).
Calibration is performed by measuring the thermoelectric voltage generated when one junction of the thermocouple is placed at the metal’s freezing plateau temperature, while the other is maintained at 0.00 °C.
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
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