When employing thermometer calibration by the Comparison Method, readings from a thermometer with unknown accuracy are compared to those from a standard device. The standard device is calibrated to meet the quality requirements of the National Institute of Standards and Technology (NIST) or a similar governing body. Typically, this method of calibration is used for liquid-in-glass thermometers. This technique often applies to Standard platinum resistance thermometers (SPRT) and resistance temperature detectors (RTD) for industrial equipment
What is the Fixed Point Method? The Fixed Point Method of thermometer calibration assures the quality and accuracy of a thermometer’s measurements. Typically, only national metrology laboratories use it. Thermometer calibration by the fixed point method focuses on instruments that must measure accurately within ±.001℃. This method uses the ITS-90 international temperature scale developed in 1990. Based on the thermodynamic or absolute temperature scale, ITS-90 is not truly a scale. It is a set of
What Is Metrology?
Category: Calibration Science
Per Merriam-Webster’s online dictionary, metrology is “the science of weights and measures or of measurement.”  It can also refer to a system of weights and measures.  Definitions are helpful, but application is more meaningful. Why are measurements so important? How does standardization work? What purpose does it serve in the real world applications of science, business, finance, and technology? The Importance of Metrology Metrology is important for several reasons: Knowledge must be shared.  Without common measures,