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Temperature Calibration - UKAS
Contact Thermometer and Infrared Thermometer Calibration

Our UKAS temperature laboratory uses a range of reference platinum resistance thermometers, noble metal thermocouples, stirred liquid baths, specially designed isothermal calibration furnaces and black body sources to provide a comprehensive facility for cost effective thermometer calibration or temperature probe calibration over the range -80C to 1,200C.

Both contact thermometers or temperature probes such as thermocouples, prts and dial thermometers; and non-contact infrared thermometers and thermal imaging cameras are covered. We can even calibrate temperature sources such a dry block calibrators or calibration baths.

We are also able to offer stand alone UKAS calibration of digital thermometer readouts (without a temperature probe). As these are essentially an electrical instrument they are calibrated in our electrical laboratory.

The calibration uncertainties detailed below are typical examples of our best calibration and measurement capability for a reasonably repeatable thermometer. The final uncertainties quoted on the calibration certificate will include an allowance for the actual repeatability of the thermometer under test during the calibration. If the thermometer was submitted with its own readout and hence calibrated as a system, then an additional allowance will be included in the uncertainty budget to cover the resolution of the thermometer readout.

For more information, give us a call on 0845 241 1533 or send an enquiry from our contact page.

Platinum Resistance Thermometer Calibration (PRTs / RTDs)

Best UKAS Temperature Calibration Uncertainties (for a stable 4 wire PRT)...

0.013C at -80C
0.011C at -50C
0.007C at 0C
0.010C at 20C
0.015C at 160C
0.016C at 260C
0.032C at 420C
0.055C at 660C

Industrial 2, 3 and 4 wire PRTs will have a larger uncertainty.

Thermocouple Calibration (Base Metal Types)

Thermometer probes and also thermocouple compensation or thermocouple extension cable, over the relevant range.

Typical UKAS Calibration Uncertainties...

0.15C from -80C to 420C
0.20C from 420C to 660C
1.20C from 660C to 1100C
2.10C from 1100C to 1200C

The above uncertainties are typically our best for most high quality stable base metal thermocouples. A typical industrial thermocouple will attract a larger uncertainty. Over the -80C to 250C temperature range we able able to significantly improve on these uncertainties for thermocouples that have an integral cold junction. The process is however time consuming and quite expensive, and for most applications, unnecessary.

Platinum Thermocouple Calibration

Thermometer probes and also noble metal extension cable or type 'U' thermocouple compensation cable, over the relevant range.

Typical UKAS Calibration Uncertainties...

0.50C from 20C to 660C
1.20C from 660C to 1100C
2.10C from 1100C to 1200C

Again, these are typically our best uncertainties for most high quality stable platinum thermocouples. Typical industrial thermocouples will attract a larger uncertainty. Over the 0C to 250C temperature range we can significantly improve on these uncertainties for thermocouples or that have an integral cold junction.

Calibration of Indicating Thermometers (temperature probes with readout, calibrated as a system)

The device under test may be an electronic display with an attached probe. All temperature probe or thermometer types are covered, including PRT, thermistor or thermocouple.

Dial thermometer and chart recorder type devices are also covered.

The basic calibration uncertainty will usually be a little better than the uncertainties achievable for 4 wire PRTs, but with an additional allowance for repeatability of the device under test and resolution of its readout.

Calibration of Dry Block Temperature Calibrators or Calibration Baths

Typical UKAS Temperature Calibration Uncertainties...

0.035C from -80C to 0C
0.032C from 0C to 100C
0.04C from 100C to 250C
0.06C from 250C to 425C
0.09C from 425C to 660C
1.1C from 660C to 1100C
2.0C from 1100C to 1200C

Infrared Thermometer Calibration (Radiation Thermometer)

Typical UKAS Infrared Thermometer Calibration Uncertainties...

0.8C from 20C to 100C
1.2C from 100C to 200C
1.9C from 200C to 300C
2.1C from 300C to 400C
2.6C from 400C to 500C

UKAS accredited infrared thermometer calibration can currently be undertaken over the above range. Any infrared results that fall outside of the above range may be included on the UKAS calibration certificate for completeness but will not be UKAS accredited.

Calibration of Thermal Imagers (Infrared Thermal Imaging Camera)

Thermal imaging cameras that are able to display a measured radiant temperature should be calibrated. Our temperature ranges and uncertainties for UKAS thermal imager calibration will be similar to those quoted for an infrared thermometer calibration.

For more information, give us a call on 0845 241 1533 or send an enquiry from our contact page.

ITS-90
The International Temperature Scale of 1990

The international measurement community defines a temperature scale which is sufficiently reproducible and accurate to satisfy most practical requirements. This scale is revised periodically, the latest revision being the International Temperature Scale of 1990 (ITS-90).

ITS-90 approximates the true thermodynamic scale by specifying a number of fixed points along the scale, such as the triple point of mercury -38.8344C , the triple point of water 0.01C , the melting point of gallium 29.7646C, and so on. These fixed points are selected because their temperatures are fixed by a physical process and hence are highly reproducible anywhere in the world. ITS-90 also specifies highly reproducible types of thermometers to interpolate between these fixed points.

We use ITS-90 as the reference scale when carry out temperature calibration work.

Temperature Calibration
Typical Manufacturers
Ametek, Braun, Comark, Cropico, Digitron, Druck, Eurotherm, Flir, Fluke, Hart, Isotech, Jofra, Land, Omega, Omron, Raytek, Testo
Typical Instrument Types
Dial Thermometer, Digital Thermometer Readout, Dry Block Calibrator, Ear Thermometer, Freezer, Hot Block, Infrared Thermometer Calibration, Oven, Platinum Thermometer, PRT, RTD Probe, Soldering Iron, Temperature Probe, Temperature Chart Recorder, Temperature Sensor, Thermal Imager, Thermocouple, Thermistor, Tympanic Thermometer