Series lftl liquidfill angle lead free thermometers are used in commercial, residential, and institutional hvac applications. The galileo thermometer is an accurately functioning machine that is. Throttling devices andor a liquid filled the primary considerations in specifying. Thermometer, liquidfilled article about thermometer. Liquid in glass thermometer principle instrumentation tools. These are brilliantly designed in order to perform well even in the less than ideal conditions. Sunbelt transformer liquidfilled transformer instruction and maintenance manual 2 1 introduction the instructions in this booklet apply to liquidfilled transformers manufactured by sunbelt transformer in temple, tx, sharon, pa and bakersfield, ca. Unlike the mercuryinglass thermometer, the contents of an alcohol thermometer are less toxic and will evaporate quickly. The advantages of a glass thermometer over other thermo meters such as dial. As the temperature of the liquid in the reservoir increases, it expands and rises into the capillary tube. The alcohol thermometer or spirit thermometer is an alternative to the mercuryinglass thermometer and has similar functions. It is the performance of the liquid pressure gauge and the increase in roi by using it are the two prime reasons as to why these liquid pressure gauges are used. A galileo thermometer or galilean thermometer is a thermometer made of a sealed glass cylinder containing a clear liquid and several glass vessels of varying density. Pad the bottom of the cup to prevent damage to the bulb.
Monitor important temperatures from the intake manifold, cylinder head and transmission with our liquid filled engine thermometer. A sdvosb service disabled veteran owned small business. Scale aluminum industrial thermometer 30 to 300 degree f 9 in. The ethanol version is the most widely used due to the low cost and relatively low hazard posed by the liquid in case of breakage. Liquidfilled thermometer article about liquidfilled. Liquid in glass thermometer principle the liquid in glass thermometer, is the most commonly used device to measure temperature and it is inexpensive to make and easy to use. A dial thermometer filled system thermometer can either be read at the point of measurement or from a remote location using a desired. Liquid filled dial thermometer based on liquid other than mercury expansion principle is used for measuring temperature ranging from 300c to 2500c. Dial thermometers will be universal adjustable angle type 80700 series or, when the thermometer bulb is located 7 feet in. Liquid filled dial thermometer temperature measuring. Engine thermometers, transmission thermometer, cylinder. Total immersion pocket thermometers are a compact 160mm 6. The liquid that is filled in the pressure gauge is usually glycerin or silicon oil.
It consists of mercury as a liquid filled in a glass tube. It is a sealed glass tube type model with a polypropylene cases, glass lens, nonmercury bed sensing fluid, and lead free brass thermowells. Some thermometers may still contain mercury but many typically contain less toxic liquids. The most common liquid used in common household thermometers used to be mercury, but because of that materials toxicity, it has been replaced by alcohol, or ethanol.
Scale aluminum industrial thermometer 30 to 240 degree f 9 in. It has faster response and the same is available in rigid stem as well as capillary type for remote sensing. Liquid filled thermometers with an abbreviated scale are used to attain the required accuracy and convenience. The liquid is often mercury, but alcohol thermometers use a colored alcohol. Liquid filled dial thermometer liquid filled system based on liquid other than mercury expansion principle is used for measuring temperature ranging from 300c to 2500c. An alcohol thermometer is a small sealed tube made of glass that has a small hollow bulb on one end and a thin capillary opening running through the length of its center. Liquidinglass thermometers lets start our story with one of the most common thermometers used today, the liquidinglass lig thermometer. Wise instituteforbasicstandards nationalbureauofstandards washington,d. Floating in the water within the tube are glass bubbles also filled with water containing simple food coloring, though sometimes alcohol might be used.
A thermometer is an instrument designed to measure and indicate the temperature of a specific application or condition. Physical and chemical properties physical state liquid appearance silver odor odorless odor threshold no information available ph no information available melting pointrange38. A procedure for the effective recalibration of liquidin. An assortment of galileo thermometers of various sizes. The precision of a liquidfilled thermometer is determined by the magnitude of a scale division. A liquid will expand or contract in proportion to its temperature and in accordance to the liquids coefficient of. The instructions and guidelines provided should only be performed by trained personnel. Liquid filled thermometers will have a steel bourdon tube. The bigger the size, the more precise the instrument. In a thermometer, the color helps determine the type of liquid. The coefficient of cubical expansion of mercury is about eight times greater than that of glass.
The portion of the capillary above the liquid level is often times filled with an inert gas, such as nitrogen, to prevent. A liquid thermometer works by using the thermal expansion of a liquid within a capillary tube to measure temperature. Weksler pressure and temperature instruments full line. Liquidfilled thermometers provide a direct reading of the temperature. Every angle type can be offered in all ss construction. Instantaneous measurements of temperature in water. Insert the thermometer, bulb down, in the centrifuge. As the temperature around the thermometers bulb heats up, the liquid rises in the glass tube. Apart from its industrial and laboratory use, it finds application in both domestic and medical fields. Common types of liquid thermometers use mercury, toluene or less toxic biodegradable liquids.
Lig thermometer, by definition, is a glass capillary tube with a liquidfilled bulb at one end. The individual floats rise or fall in proportion to their respective density and the density of the surrounding liquid. Standard operating procedures for instantaneous measurements of temperature in water v 1. Thermometer, liquidfilled a temperaturemeasurement device whose operation is based on the thermal expansion of a liquid.
Liquid fill gauge is a circle gauge that represents a percentage value, but in an eye catching way. A lig thermometer, by definition, is a glass capillary tube with a liquidfilled bulb at one end. The invention of the thermocouple ushered in a whole new wave of. Three phase, liquid filled primary and secondary unit. How does a liquid filled thermometer liquidinmetal. A liquidinglass thermometer consists of a capillary glass tube with a bulb at one end filled with a thermometric liquid, vacuumed and sealed.
A liquidinglass thermometer in a protective metal case with an open window for reading the temperature marks and bulb holes to allow. Filled system temperature measurementthermometer,working. When a thermometer is equipped with a well, the well should be installed onto the apparatus first. The stem, or capillary, of a lig thermometer is made of annealed glass. A thermometer has a glass tube sealed at both ends and is partly filled with a liquid like mercury or alcohol. Whats a galileo thermometer and how do you read it. In the lig thermometer the thermally sensitive element is a liquid contained in a graduated glass envelope. A procedure for the effective recalibration of liquidinglass thermometers author. Thermometer, this is an instrument of extreme accuracy and rugged dependability. The anatomy of a liquidinglass thermometer aashto re.
As the temperature of the liquid in the reservoir increases, it expands. Our engine thermometer is liquidfilled to absorb harmful vibrations that make it difficult to take readings and. The traditional thermometer is a glass tube with a bulb at one end containing a liquid which expands in a uniform manner with temperature. Liquidfilled transformer instruction and maintenance manual. Theres no more beautiful way to measure the temperature than using. The liquid in glass thermometer has a glass bulb attached to a sealed glass tube also called. The liquid fill gauge custom visual is perfect to use when you want to visualize data that represents liquid levels. Measuring and recording rectal temperature nonmercury liquidfilled glass thermometer 22. It determines the temperature based on the change of pressure in gas or liquid. Mercury filled thermometers and hydrometers revision date 20aug2014 9. The sensitivity to ambient temperature is approximately a factor of 6 higher for thermometers filled with organic liquids than for mercuryfilled thermometers. The stem of the thermometer should then be coated with a heat conducting medium a mixture of glycerin and graphite.
Force the liquid down the capillary using a centrifuge with a cup deep enough to apply centrifugal force below the liquid column. Manometric thermometers can be filled with gas nitrogen, condensation alcohol, chloromethane, diethyl, liquid. Three phase, liquid filled, compartmental type, pad. Filled system thermometers the measurement, control. Scale plastic industrial thermometer 0 to 120 degree f 9 in. The type of glass used is chosen based upon the temperature range of the device so as to minimize the effects of expansion and contraction of the tube. A typical liquidinglass thermometer is shown in the figure below. This type is also known as a pressure filled or vapourpressure thermometer. This device is used for measuring temperature due to its accuracy and the fact that it does not require any other equipment except the human eye.
A liquidinglass thermometer is a glass capillary tube having a liquidfilled bulb present at one end. The glass thermometer must be the most familiar of all thermometers. Astin,director calibrationof liquid inglassthermometers jamesf. An example of the liquidinglass thermometer is the mercury thermometer which been in use since. Glass thermometer an overview sciencedirect topics. Liquid inmetal thermometers liquid filled thermometers use the pressure rise of a liquid that comes along with an increase in temperature, if the volume is kept constant. Liquidfilled bimetal manufacturers, service companies and distributors are listed in this trusted and comprehensive vertical portal.
Filled system temperature measurement systems have been mostly replaced in new facilities with electronic measurements based on thermocouples or rtds filledsystem temperature measurement methods depend upon three wellknown physical phenomena. The principle used to measure temperature is that of the apparent thermal expansion of the liquid. Scale aluminum industrial thermometer 30 to 300 degree f economy industrial thermometer is ideal for measuring water economy industrial thermometer is ideal for measuring water temperatures in hot or cold supply lines. Although many people commonly associate thermometers with a mercury filling, the dangerous properties of mercury have spurred manufacturers to use other liquids inside the glass gauges.
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