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When the bulb contacts a hot object, the liquid in it expands and rises in the tube. The glass stem of a thermometer is thick and acts as a cylinder lens. We all are aware of it and use it many times for measuring our body temperature in case of fever. A typical liquid-in-glass thermometer is shown in the figure below. It consists of mercury as a liquid filled in a glass tube. describe the process of calibration of a liquid-in-glass thermometer, including the need for fixed points such as the ice point and steam point Their sensitivity is based upon the reversible thermal expansion characteristics of the liquid in comparison to the glass. Point of reference i.e. Unlike electrical thermometers, they do not necessitate power supply or batteries for charging. These thermometers display temperature either in Celsius or Fahrenheit scales. A working liquid which is generally either mercury or alcohol. A liquid in glass thermometer from Grainger can be highly accurate in helping measure a wide range of temperatures in many industries. Liquid element contained in a glass thermometer may be perilous or risky to health owing to their potential chemical spills. This temperature should be recorded because a glass thermometer does not offer a recall of the measured temperature.”. No special means are needed to measure temperature via these thermometers. Following are the major advantages associated with the use of liquid-in-glass thermometers: Use of liquid-in-glass thermometers includes following limitations too: http://automationwiki.com/index.php?title=Liquid-In-Glass_Thermometers&oldid=245174, Subsidies For Energy-Efficient Commercial Buildings in the USA. The fluid used is normally either mercury or colored alcohol, which is contained within a bulb and capillary tube, as shown in Figure 14.15a. Liquid-in-glass thermometers are mainly employed in Navy and Marine Corps in different configurations. They are also applied in meteorological and oceanographic applications, where they are generally calibrated by graduations eternally engraved into the glass. These instruments can be used to calibrate Liquid-In-Glass, RTD, Thermistors, Thermocouples, and Bi-Metal Thermometers. The more the thermal expansion of the liquid, the highly sensitive the thermometer is. The foremost liquid-in-glass thermometer was introduced in the year 1650 in which the liquid filled in was spirit from wine. Clin Chem. Liquid In Glass Thermometer Calibration, maintenance, repair, and sales. “In the LIG thermometer the thermally sensitive element is a liquid contained in a graduated glass envelope. If the thermometer is not in good thermal contact with the body being History. Point of reference i.e. The liquid was almost always mercury or coloured alcohol, sealed in a glass tube…  is the simplest and most commonly employed type of temperature measurement device. The response time of a liquid-in-glass thermometer varies according to the kind of thermometer, its bulb volume, thickness and overall weight. “An error can be produced when the thermometer is not immersed to the same extent as it was when it was originally calibrated. These thermometers display temperature either in Celsius or Fahrenheit scales. Medical thermometers such as mercury-in-glass thermometers, infrared thermometers, pill thermometers, and liquid crystal thermometers are used in health care settings to determine if individuals have a fever or are hypothermic. Liquid in glass thermometer stem3. Liquid-in-glass t hermometer can be used to measure atmospheric temperature, semi-solids, or liquids. 1 Answers. These environmentally safe thermometers are PFA safety coated to keep liquid and glass contained in the event of breakage. Although their thermal expansion is high but they are non linear and their use is restricted for high temperatures. INTRODUCTION Liquid–in-glass thermometers (hereinafter referred to as thermometers) measure the tem- perature by use of the thermal expansion of a temperature-sensitive liquid in a transparent glass bulb and a capillary tube. Typically, three classes of immersion exist which are total, partial and complete immersion classified according to the level of contact between the medium and the sensing element. Glass thermometer limitations. Glass thermometer features4. Parallax errors of many tenths of a division may easily occur in reading a liquid-in-glass thermometer. a calibration point which is most commonly the ice point. Besides, they can not provide digital and automated results. Thermco’s Certified Thermometers are used in temperature verification and calibration procedures. I'd like to receive the newsletter. The application of mercury (1714) and Fahrenheit scale (1724) for liquid-in-glass thermometers ushered in a new era of accuracy and precision in thermometry, and is still to this day (as of 1966) regarded as one of the most accurate thermometers available. One can read temperature readings easily with human eyes. This type of thermometer was developed by a German based physicist named Daniel Gabriel Fahrenheit. They can be frequently applied in areas where there is problem of electricity. Although their thermal expansion is high but they are non linear and their use is restricted for high temperatures. For getting quick response, the bulb of the thermometer should be designed in such a way that it results in small and the bulb wall thin. As compared to electrical thermometers, they are very weak and delicate. They find their use in variety of applications such as medicine, metrology and industry. Therefore, they must be handled with extra care because they are likely to break. (ASME B40.3) One Year Warranty Use LiG thermometers to help determine refrigerator, freezer, incubator, water bath, chemical, brewing solution and oven temperatures among others. What Are The Advantages And Disadvantages Of Liquid In Glass Thermometer? Later on, more linear thermometers were developed with the use of mercury as a liquid inside the thermometer. It is cheap, portable and convenient. The foremost liquid-in-glass thermometer was introduced in the year 1650 in which the liquid filled in was spirit from wine. Thus, temperature conversion would be needed if the temperature reading is wanted in some other scale. The principle used to measure temperature is that of the apparent thermal expansion of the liquid. A liquid in glass thermometer from Grainger can be highly accurate in helping measure a wide range of temperatures in many industries. Liquid-in-Glass SP Bel-Art labware and apparatus, and SP Wilmad-LabGlass glassware, NMR and EPR tubes and accessories are the choice for getting things done in … There are infrared thermometers specially made for long-range measurements. Correct application of liquid-in-glass thermometers for accurate temperature measurements in the clinical laboratory. Key features of liquid-in-glass thermometers include: Liquid-in-glass thermometers are mainly employed in Navy and Marine Corps in different configurations. It cannot record temperature automatically or electronically. Reading temperature via liquid-in-glass thermometers call for brilliant eyesight. Hence, their use is limited to areas where only manual reading is adequate, for example, a household thermometer. 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