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Filled-System Thermometer |
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filled-system thermometer [¦fild ¦sis·təm thər′mäm·əd·ər]
(engineering) A thermometer which has a bourdon tube connected by a capillary tube to a hollow bulb; the deformation of the bourdon tube depends on the pressure of a gas (usually nitrogen or helium) or on the volume of a liquid filling the system. Also known as filled thermometer. Thermometer, Filled-System a device for temperature measurement. The operation of a filled-system thermometer is based on one of three principles: the thermal expansion of a liquid, the temperature dependence of the pressure of a gas, or the temperature dependence of the saturated vapor pressure of a liquid. A distinction is made between gas-filled, liquid-filled, and vapor-filled, or vapor-pressure, thermometers. (The substances that are used as fills in the three types are nitrogen, mercury, and ethyl chloride, respectively.) A filled-system thermometer is a hermetically sealed system consisting of a bulb connected by a capillary to a readout or recording spring manometer. Thermometers of this type are commonly used in industry in the temperature range from –60° to 550°C. With long capillaries of up to 60 m such thermometers may be used for remote temperature measurement. The scale of the manometer that measures the pressure in the bulb of a filled-system manometer is calibrated in degrees Celsius. D. I. SHAREVSKAIA Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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