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Although "International Temperature Scale of 1990" has the word "scale" in its title, this is a misnomer that can be misleading. The ITS-90 is not a scale; it is an equipment calibration standard. Temperatures measured with equipment calibrated per ITS-90 may be expressed using any temperature scale such as Celsius, Kelvin, Fahrenheit, or Rankine.
Electronic Temperature Instruments Limited (ETI) is a worldwide manufacturer and distributor of thermometers and portable test and measurement instrumentation. ETI supplies catering, industrial, HVAC, wireless, legionnaires, refrigeration thermometers and environmental monitoring instruments to various industries. These include food production ...
E2758-10 Standard Guide for Selection and Use of Wideband, Low Temperature Infrared Thermometers. E2847-11 Standard Practice for Calibration and Accuracy Verification of Wideband Infrared Thermometers. Current work items. WK37564 New Classification for Radiation Thermometers. Future work items
To avoid this, some weather services require that all mercury-in-glass thermometers be brought indoors when the temperature falls to −37 °C (−35 °F). To measure lower meteorological temperatures, a thermometer containing a mercury-thallium alloy which does not solidify until the temperature drops to −61.1 °C (−78.0 °F) may be used.
Other thermometers to be calibrated are put into the same bath or block and allowed to come to equilibrium, then the scale marked, or any deviation from the instrument scale recorded. [39] For many modern devices calibration will be stating some value to be used in processing an electronic signal to convert it to a temperature.
Infrared thermal imaging cameras or infrared cameras are essentially infrared radiation thermometers that measure the temperature at many points over a relatively large area to generate a two-dimensional image, called a thermogram, with each pixel representing a temperature. This technology is more processor- and software-intensive than spot or ...
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