Mercury in glass thermometer for measurement of room temperature. Primarily designed for the harshest of environments the model mis is especially suitable for places which are. It was invented by a british scientist james six, born in canterbury, in 1780. It exists in three forms that have different properties, usage, and toxicity. Stainless steel available as an option model 4 reed switches model 144 magnetic assisted switches accuracy class model 129 mercury switches cl. The glass thermometer must be the most familiar of all thermometers. The coefficient of cubical expansion of mercury is about eight times greater than that of glass.
An impressive technical specification and wide range of standard features make this thermometer. Newer nondigital fever thermometers often use alcohol or a nontoxic compound that looks similar to mercury. A comparison of mercury and digital clinical thermometers. Mercury mercury is an element and a metal that is found in air, water, and soil. As the air temperature rises, the mercury exits the bulb and passes through the. The functionality of the bulb is to store the mercury and is usually made of stainless steel, but can be made of glass as well. In these thermometers a mechanism linear scale is obtained which the system preferable to customers who require good. The instrument chosen is a vapor pressure thermometer, such as is suitable for temperatures of up to 600 c and commonly installed in the individual exhaust ports of mediumspeed diesel engines.
Mercury in glass thermometer 1 mercury in glass thermometer closeup of a maximum thermometer. Mercury thermometers can be used to determine body, liquid, and vapor temperature. Liquid mercury vaporizes evaporates at room temperature causing elevated levels of mercury in indoor air. What happens to the temperature of the water and what happens to the temperature of the ice cubes while they are melting. The scale is calibrated to read temperature directly. Mar 23, 2020 how to dispose of mercury thermometers. After cleaning up the mercury, place the used sponge and the broken thermometer with heavy tape over the broken ends in a sturdy plastic bag. Mercury in steel thermometer manufacturer from mumbai, india. Thermometer is mineral spirit filled to eliminate workplace and environmental hazards associated with mercury. Exporter of industrial thermometer mercury in steel thermometer, bimetal thermometer, hand held digital thermometer offered by bose panda instrument private limited, kolkata, west bengal. It is also shown that when making clinical measurements with mercury thermometers there is no clinical advantage in using a measurement time longer than 3. Apr 01, 2019 pick a glass thermometer without mercury. All stainless steel mercury actuated thermometer model mts. Here are some ways to remove the void in the column.
Temperature measuring instruments mercury in steel. Liquid thermometers can be limited by the type of liquid used. Follow the steps in this flier to clean up the spill. Mercury is a chemical element with the symbol hg and atomic number 80. Under this range we provide mercury in steel type thermometer, bimetallic type thermometer and temperature indicator. Nominal size 200 din 16189 f type 271 dc type 272 dc type 271 dc type 273 dc industrial thermometers type dc with union nutfree. Mercury centers for disease control and prevention. These temperature gauges are used in corrosive medium, chemical environments for higher temperature.
Options of electrical contacts, long capillary, long stem length specifications. A mercury in glass thermometer, also known as a mercury thermometer, was invented by german physicist daniel gabriel fahrenheit in 1724 and is a thermometer consisting of mercury in a glass tube. Mercury in steel thermometer fm instruments mumbai india. The thermometer the solid in question is a mercury in glass thermometer that is immersed in a liquid. Class 1 1% features rugged stainless steel construction fast response protection ip65 high repeatability and small hysteresis dry or liquid filled rigid stem or bulb with capillary ranges. Select desired temperature range and divisions from the product filter to narrow your choices. A fever thermometer usually contains less than one gram of mercury, an amount no larger than the eraser on a wood pencil. It has a narrow part in the capillary tube where mercury passage is constricted between the bulb and the starting point of the scale figure 2. A maximum thermometer is a mercury thermometer used to measure the maximum temperature within a certain period. The change in internal pressure caused by the temperature variation is measured by a bourdon tube that is connected to the mercury by a capillary tube. Replacing mercury thermometers astm standardization news. Mercury filled thermometer it is one of the most versatile and widely used devices in industrial temperature measurements.
Please consult our chapter protection tubes for thermometers for further information. Amounts larger than this, like mercury from older thermostats or other devices. To measure soil temperatures at greater depths of 50 to 100 cm, a steel pipe of the desired length is driven into the soil and a mercuryinglass thermometer is. Mercury filled thermometers and hydrometers revision date 20aug2014 irritation no information available sensitization no information available carcinogenicity the table below indicates whether each agency has listed any ingredient as a carcinogen. Mercury thermometer thermometer is a device used for measuring the temperature. Component casno iarc ntp acgih osha mexico mercury 7439976 not listed not listed not listed not listed not listed. A heavy, silvery dblock element, mercury is the only metallic element that is liquid at standard conditions for temperature and pressure. Mercurya s toxicity has led several industries to look for suitable alternatives for its use in thermometry as well as its use in materials, processes and products. Different types of thermometers are used for different purposes. The temperature t indicated by the thermometer is the mercury temperature which will only equal t f under equilibrium conditions. Mercury in steel thermometer work on the principle of mercury expansion and contraction. Danzig born daniel gabriel fahrenheit, a pioneer of exact thermometry or. A non mercury thermometer is safer because it cant leak mercury.
Mercury is a persistent, bioaccumulative, toxic material that can harm the brain, heart, kidneys, lungs, and immune system of people of all ages. The mercury inglass or mercury thermometer was invented by physicist daniel gabriel fahrenheit in amsterdam 1714. It has faster response and the same is available in rigid stem as well as capillary type for remote sensing. Jan 18, 2020 mercury is used as thermometric liquid. The volume of mercury changes slightly with temperature. These devices are made using best in standard raw material procured from most authentic vendors of the industry to make our products in par with international quality standards. A gas expansion thermometer is made of a cylindrical bulb filled with inert gas. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. With helpful information like that found in the when mercury spills fact sheet, most people can safely clean up a small spill. The purpose of astm international test methods is to create a definitive procedure that produces a test result, according to form and style for astm standards. This illustration shows how fire spread may occur in a building where a steel girder passes through an. We made these thermometer using optimum quality steel, antivibration spring system, with electric contact and fill it with glycerin. Separations can usually be corrected by swinging the thermometer as is done to reset a mercury clinical thermometer. If you have a mercury thermometer in your home and you want to get rid of it, you.
Mercury in a steel bulb expands via a small bore capillary tube into a pressure indicating device, say a bourdon gauge, the position of the pointer indicating the amount of expansion and thus the temperature. All stainless steel mercury actuated thermometer model mts nominal size 100 mm or 150 mm accuracy. Mild steel or ss 316 cast alumnium weatherproof with inner screwed type abs plastic bezel. Accusafe enclosed chamber verification bottle thermometers. In clinical studies between 9 and 23% of repeated measurements using an electronic thermometer differ by 0. Mercury quick facts cleaning up mercury spills in your house february, 2009 if a thermometer or other small mercury containing item such as a thermostat or compact fluorescent light bulb breaks, you may be able to clean it up yourself. The three forms are called elemental or metallic mercury, inorganic mercury compounds, and organic mercury compounds.
B ethanol and mercury c mercury only d neither ethanol nor mercury 17 a jug of water is at room temperature. The sixs thermometer is known for separations in the mercury column, in particular after shipment, though accidental knocks have been known causes as well. Mercury vapor is not irritating and has no odor, so people do not know when they are breathing it. If you have the option, a non mercury glass thermometer is safer. Mercury in glass thermometer safety data sheet effective. Pressure thermometer an overview sciencedirect topics. Usually, mercury or some kind of alcohol is used for the liquid.
Many of todays thermometers use fluids other than mercury due to. Mercury is a liquid metal that has been used in thermometers for many years, but it is toxic if swallowed or inhaled. It consists of a bulb containing mercury attached to a glass tube of narrow diameter. Typically the smaller the reading increment, the less range it will have. The little black beads are just little black beads that weigh down the thermometer, harmless. After cleaning up the mercury, place the used sponge and the broken thermometer with heavy tape over the broken ends in. The knowledge of the molten steel temperature at the tundish is used to determine the operating.
The most common and wellknown thermometer is the liquidinglass thermometer. Even the small amount of mercury from a broken thermometer can cause harm, especially. If the column of mercury or other indicating fluid in a thermometer separates, the void will render the indicated temperature inaccurate. A mercuryinglass thermometer, also known as a mercury thermometer, was invented by german physicist daniel gabriel fahrenheit in 1724 and is a thermometer consisting of mercury in a glass tube. The index will be left at the furthest position to which mercury has expanded. There is a steel index inserted inside the capillary tube. Mercury thermometers cannot measure temperatures below this point. When it comes in contact with the place to measure and the temperature rises, the mercury leaves the bulb and when the temperature descends the mercury low and returns to deposit inside the bulb. Astm mercury filled thermometers have strict manufacturing protocols and assure high quality temperature measurements.
It can slowly change from a liquid into a gas that is invisible to the naked eye. Mercury in steel dial thermometer 04 mercury filled system based on mercury expansion principle is used for measuring temperature ranging from 400c to 6500c. Replacing mercury inglass thermometers in astm test methods some guidelines for a complex task. Inconel is a higher temperature material and is used where stainless steel is not.
It should say on the package whether it contains mercury or not, so read it carefully. May 05, 2015 the mercury in steel thermometer is an extension of the principle of the mercury in glass thermometer. If you have questions about the potential health effects after being exposed to a broken thermometer, please call your physician or your local poison control center at 1 800 2221222. Glass thermometer an overview sciencedirect topics. They are available in ranges from 38 deg c upto 600 deg c. They provide the same performance as a mercury thermometer, but use a blue liquid formula, which is nontoxic noncaustic, nonhazardous and biodegradable. Mercury in glass thermometer safety data sheet effective date. At what common temperature can the steel ring be slipped onto one end of the aluminum rod. Astm non mercury liquidinglass thermometer alternatives author. Replacing mercury thermometers with digital thermometers the purpose of this factsheet is to encourage healthcare administrators to replace mercury fever thermometers with digital thermometers. Apart from its industrial and laboratory use, it finds application in both domestic and medical fields.
Spring connected to the index prevents it from moving back to the bulb. The cylindrical bulb of a typical laboratory thermometer is about 3 mm in diameter and 12 mm long. Mercury is a silver metal, so you can tell by looking at it if it contains mercury, if its any other colour, red, green etc, then its a nontoxic oil and dye. Mercury thermometers, clinical thermometer manufacturer, oral. Bottles are designed with a special, medium length standard taper 1018 joint and are retested for accuracy within 0. Astm nonmercury liquidinglass thermometer alternatives.
This is the principle of the mercuryinglass thermometer. Mercury in glass thermometer recommended uses of the chemicalproduct. Pycnometer bottles are provided with nonmercury, redspirit filled thermometers for facilities that are designated mercuryfree. Identification of the substancemixture and of the manufacturer chemical name. As the temperature rises, the liquid expands, moving up the tube. A thermometer is a device that measures temperature or a temperature gradient. Elemental mercury, also called quicksilver, is a heavy, silvery, form of the metal mercury that is liquid at room temperature. The mercuryinglass or mercury thermometer was invented by physicist daniel gabriel. There by keeping contaminants from user and environment. One gram of mercury can contaminate a 20 acre lake, enough to cause a public advisory to be issued on the potential dangers of eating fish caught in that lake. Constructed on two types of tubing sealed together below the scale, where the stem portion is made of very fine bore glass to minimize correction factors at immersion depths other than the related products. The mercury in steel thermometer is an extension of the principle of the mercury inglass thermometer. Industrial thermometer mercury in steel thermometer.
Mercury mercury mercury mercury mercury mercury elemental mercury, also called quicksilver, is a heavy, silvery, form of the metal mercury that is liquid at room temperature. The mercury thermometer is a classic design for temperature measurement still used by many families. Thermometer has a white back and a 6 to 7mm outer diameter, and is calibrated for 76mm 3 immersion. It comprises a steel bulb, immersed in the gas of which the temperature is to be measured, and connected by a long tube to a bourdon gauge, which. Each thermometer is encapsulated in a ptef flouropolymer safetyshield which absorbs shock, and will enclose the liquid and splintered glass within the coating should breakage occur.
Close and label the bag wastebroken mercury thermometer. Daniel fahrenheits mercury in glass thermometer was far more reliable and accurate than any that had existed before, and the mercury thermometers in use today are made in the way fahrenheit devised. The range of a thermometer and it reading accuracy is dependent on the size of the hole, the length of the tube and the fluid in the thermometer. These application thermometers provide a mercury free alternative to astm mercury thermometers. Sixs thermometer is a registering thermometer which can record the maximum and minimum temperatures reached over a period of time, for example 24 hours. There are many different types of thermometer used for measuring temperature e. Liquid in glass thermometer watch more videos at lecture by. Geratherm mercuryfree oral thermometer at walgreens. Us epa, office of pollution prevention and toxics, national program chemicals division subject. It is commonly known as quicksilver and was formerly named hydrargyrum h a. Available in both rigid stem type and capillary type. A liquidinmetal thermometer in which mercury is enclosed in a steel envelope. In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube.
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