Our temperature calibration work can be done either onsite or in our calibration laboratory. Onsite calibration is confined to work that cannot be transported to our lab or sensors that are not convenient to disconnect from other apparatus. High end calibrations requiring, for example, fixed point temperature cells are only done in our calibration laboratory.

The device under test may be any of a wide variety of devices such as thermocouples, PRTs, SPRTs, thermistors, liquid in glass thermometers, mechanical thermometers, dry blocks and infrared measuring instruments.

Infrared devices may only be calibrated within our scope of SCC accreditation to ISO/IEC 17025:2017 when the spectral response of the device under test is within 8μm – 14μm. If the spectral response of the device is not defined by the manufacturer or is defined to be outside the 8μm – 14μm bandwidth a calibration cannot be carried out in compliance with our scope of SCC accreditation and NRC CLAS certification. Cautionary note regarding emissivity: If the emissivity of the target and the emissivity setting of the infrared meter are different the temperature reading may have significant errors. For example: if the measuring device has an emissivity setting of 0.95 and the emissivity of the target is 0.75 the device will display 158°C when the temperature of the target is 200°C (42°C error).

All temperature calibrations at Miller Instruments follow the requirements of the ITS-90 (International Temperature Scale of 1990). Our CLAS scope in thermometry extends from -90°C to 650°C and satisfies the requirements of the quality management standard ISO/IEC 17025:2017 as implied by our SCC accreditation and NRC CLAS certification.

Our complete accredited scope in temperature may be found on National Research Council’s CLAS web site: scope >