Types of thermometers

Types of thermometers

This year, at the turn of spring and summer, the fierce epidemic of SARS has made the measurement of body temperature a very important thing in people's daily life.

Measurement of body temperature of course, the thermometer, different thermometers have their own advantages and disadvantages, in general, the market for thermometers according to the type of material to points, can be divided into the following kinds: ① glass mercury thermometer: this is the most common thermometer, based on the convenience of different parts of the body measurement, can be divided into anal temperature table (body round head thick), axillary temperature table (body flat head thin), mouth thermometer (body round head thin) three kinds. In all thermometer types, the temperature measured by this thermometer is the most accurate, but because the scale is too fine, the measured temperature is not easy to read, but also has the disadvantage of easy to be broken.

② electronic digital display thermometer: this is a new product in the last decade is gradually being widely used, is a digital display thermometer, to meet the shortcomings of the glass mercury thermometer is not easy to read. There is only one shape of electronic thermometer, which can be used to measure anal temperature, axillary temperature or oral temperature at the same time.

Usually if the battery is not damp, you can measure about 10,000 times, the use of heavy fall should be avoided, so as to avoid circuit damage and failure. ③ Sticker thermometer: This is a kind of thermometer paper that can be used repeatedly, pressed on the forehead, and will change color according to the body temperature. Due to its small size, it can't accurately measure the body temperature, but it's very convenient to carry it when you are traveling.

4 Pacifier thermometer: Pacifier thermometer is mainly used to measure the temperature of small babies sucking on milk, the shape is the same as the baby pacifier, if you suspect that the baby has a fever, as long as it is put into the mouth of the child sucking can measure the body temperature. ⑤ Ear temperature gun: This is a thermometer shaped like an otoscope, one end into the ear, pull the "trigger" in a second to learn about the body temperature of the person, respectively, can show the anus and the mouth temperature of the two kinds of temperature, but the price is expensive, the general family does not need to use the ear temperature gun.

⑥ disposable thermometer: this is the last three or four years of new imports of thermometers, the shape of its slightly larger flat, can be measured correctly the temperature of the mouth, only once on the abandonment of the patient can be avoided to avoid the infection of the disease between patients, but the relative cost is also high.

Types of thermometers

Types of thermometers

At the beginning of this year's spring and summer, the fierce "SARS" epidemic, so that the measurement of temperature has become a very important thing in people's daily lives. Measurement of body temperature of course, the thermometer, different thermometers have their own advantages and disadvantages, in general, the market for thermometers according to the type of material to points, can be divided into the following kinds:

① glass mercury thermometer:

This is the most common thermometer, based on the convenience of different parts of the human body to measure, can be divided into the anal temperature table (body round head thick), axillary temperature table (body flat head fine), mouth thermometer (body round head) three kinds. The thermometer can be divided into three types.

In all thermometer types, the temperature measured by this thermometer is the most accurate, but because the scale is too fine, the measured temperature is not easy to read, but also has the disadvantage of easy to be broken.

② Electronic digital display thermometer:

This is a new product in the last decade is gradually being widely used, is a digital display thermometer, to meet the glass mercury thermometer is not easy to read the shortcomings.

Electronic thermometers come in one shape and can be used to measure anal, axillary, or oral temperatures at the same time. Usually if the battery is not damp, it can be measured about 10,000 times, and should be used to avoid heavy fall, so as not to damage the circuitry and malfunction.

③ Sticker thermometer:

This is a kind of thermometer that can be used repeatedly, pressed on the forehead, and will change color according to the body temperature, due to its small size, so it can't accurately measure the body temperature, but it's very convenient to carry it when you travel.

④ Pacifier thermometer:

The pacifier thermometer is mainly used to measure the temperature of a baby who is sucking on the breast milk, and the shape is the same as a baby's pacifier, so if you suspect that the baby has a fever, you just need to put it into the mouth of the child and suck on it to measure the body temperature.

⑤ Ear thermometer:

This is a thermometer shaped like an otoscope, one end into the ear, pull the "trigger" in a second to learn the human body temperature, anal and oral temperature can be displayed separately two kinds of body temperature, but the price is expensive, and the general family does not need to use the ear thermometer.

⑥ disposable thermometer:

This is the last three or four years of new imports of thermometers, the shape of a slightly larger flat, can be measured correctly the temperature of the mouth, only one time to be discarded, can avoid the infection of the disease between patients, but the relative cost is also high.

What are the types of thermometers?

1, gas thermometer: more hydrogen or helium as a temperature measurement material, because the liquefaction temperature of hydrogen and helium is very low, close to absolute zero, so it is a wide range of temperature measurement. This thermometer is very high accuracy, mostly used for precision measurements. 2, resistance thermometer: divided into metal resistance thermometer and semiconductor resistance thermometer, are based on the resistance value with the change in temperature of this characteristic made. Metal thermometer is mainly useful for platinum, gold, copper, nickel and other pure metals and rhodium-iron, phosphor bronze alloy; semiconductor thermometer mainly with carbon, germanium and so on. Resistance thermometer is easy to use and reliable, has been widely used. Its measurement range of -260 ℃ to 600 ℃ or so.? 3, temperature difference thermocouple thermometer: is a widely used in industry temperature measurement instruments. The use of temperature difference electric phenomenon made. Two different wires welded together to form the working end, the other two ends and measuring instruments connected to form a circuit. The working end is placed at the temperature to be measured, and when the temperature of the working end differs from that of the free end, an electromotive force occurs, and thus a current flows through the circuit. Through the measurement of electrical quantities, the temperature of a known place can be determined using the temperature of another place. These thermometers are mostly made of copper - conchal, iron - conchal, nickel - conchal, gold cobalt - copper, platinum - rhodium, etc. --Rhodium and other components. It is suitable for temperature difference between two substances, mostly used for high temperature and low turbidity measurement. Some of the temperature difference thermocouple can measure up to 3000 ℃ high temperature, some can measure the low temperature close to absolute zero degree ...? 4, high-temperature thermometer: is specifically designed to measure temperatures above 500 ℃ thermometer, light measurement thermometer, colorimetric thermometer and radiation thermometer. High-temperature thermometer principle and construction are more complex, will not be discussed here. Its measurement range of 500 ℃ to 3000 ℃ or more, is not applicable to the measurement of low temperature. 5, pointer thermometer: is shaped like a dashboard thermometer, also known as the heat and cold table, used to measure the room temperature, is made of metal thermal expansion and contraction principle. It is a bimetal as a temperature-sensitive element, used to control the pointer. Bimetals are usually made of copper and iron riveted together, with the copper on the left and the iron on the right. Due to the thermal expansion and contraction effect of copper is much more pronounced than iron, so when the temperature rises, the copper pulls the iron bent to the right, the pointer in the bimetal drive to the right (pointing to high temperatures); Conversely, the temperature becomes low, the pointer in the bimetal drive to the left (pointing to low temperatures). 6, glass tube thermometer: glass tube thermometer is the use of the principle of thermal expansion and contraction to achieve the temperature measurement. Due to the expansion coefficient of the temperature measurement medium and the boiling point and freezing point of the different, so we commonly see the glass tube thermometer are: kerosene thermometer, mercury thermometer, red pen water thermometer. His advantages are simple structure, easy to use, relatively high precision measurement, low price. The disadvantage is that the upper and lower limits of measurement and accuracy by the quality of the glass and the nature of the temperature measurement medium restrictions. And can not be transmitted, fragile. 7, pressure thermometer: pressure thermometer is the use of closed containers of liquid, gas or saturated vapors heat produced by volume expansion or pressure change as a measured signal. Its basic structure is composed of the temperature package, capillary tube and indication of three parts of the table. It is one of the earliest methods used for temperature control of production processes. Pressure thermometry is still a widely used measurement method for in situ temperature indication and control. Pressure thermometer advantages are: simple structure, high mechanical strength, not afraid of vibration. Low price, does not require external energy. Disadvantages are: temperature range is limited, generally in -80 ~ 400 ℃; heat loss of large response time is slow; instrumentation sealing system (temperature package, capillary tube, spring tube) is damaged and difficult to repair, it must be replaced; measurement accuracy by the ambient temperature, the temperature package installation location has a greater impact on the accuracy of the relatively low; capillary tube transmission distance is limited. 8, rotating thermometer: rotating thermometer is made of a curled bimetal. One end of the bimetal is fixed, the other end is connected to the pointer. Two pieces of metal due to different degrees of expansion, at different temperatures, resulting in different degrees of bimetal curl, the pointer then points to different positions on the dial, from the dial readings, you can know its temperature. 9, semiconductor thermometer: semiconductor resistance changes and metal is different, when the temperature rises, its resistance is reduced, and the magnitude of the change is greater. Therefore, a small amount of temperature change can also make a significant change in resistance, made of thermometers have a high degree of precision, often referred to as temperature sensors. 10, thermocouple thermometer: thermocouple thermometer is composed of two different metals connected to a sensitive voltmeter. Metal contacts at different temperatures, will produce different potential difference between the two ends of the metal. The potential difference is so small that a sensitive voltmeter is required to measure it. By the reading of the voltmeter, you can know why the temperature. 11, light pyrometer: If the object temperature is high enough to emit a large amount of visible light, it can be used to measure the amount of thermal radiation to determine its temperature, such thermometers that is the light thermometer. This thermometer is mainly equipped with a red filter by the telescope and a set of small bulbs, ammeter and variable resistance circuit made. Before use, first establish the relationship between the temperature corresponding to the different brightness of the filament and the reading on the ammeter. When used, the telescope to be measured, adjust the resistance, so that the brightness of the bulb to be measured with the same, then from the ammeter can be read to be measured on the temperature. 12, liquid crystal thermometer: made of liquid crystals with different formulations, its phase transition temperature is different, when its phase change, its optical properties will change, so that the liquid crystal looks color. If the different phase transition temperature of liquid crystal coated on a piece of paper, the liquid crystal color changes, you can know why the temperature. The advantage of this thermometer is that it is easy to read, but the disadvantage is that it is not accurate enough, and it is often used in ornamental aquariums to indicate the temperature of the water.

Types of thermometers - What kinds of thermometers are there? Which one is more accurate, convenient and safe?

Hello! Types of thermometers Taking a temperature is a very important thing in people's daily lives.

Measurement of body temperature of course, the thermometer, different thermometers have their own advantages and disadvantages, in general, the market for thermometers according to the type of material to points, can be divided into the following kinds: ① glass mercury thermometer: This is the most common thermometer, based on the convenience of different parts of the body measurement, can be divided into the anal temperature table (body rounded head thick), axillary temperature table (body flat head thin), mouth thermometer (body round head thin) three kinds. In all thermometer types, the temperature measured by this thermometer is the most accurate, but because the scale is too fine, the measured temperature is not easy to read, but also has the disadvantage of easy to be broken.

② electronic digital display thermometer: this is a new product in the last decade is gradually being widely used, is a digital display thermometer, to meet the shortcomings of the glass mercury thermometer is not easy to read. The electronic thermometer has only one shape and can be used to measure anal, axillary or oral temperature at the same time.

Usually if the battery is not damp, you can measure about 10,000 times, the use of heavy fall should be avoided, so as to avoid circuit damage and failure. ③ Sticker thermometer: This is a kind of thermometer that can be used repeatedly, pressed on the forehead, and will change color according to the body temperature. Due to its small size, it can't accurately measure the body temperature, but it's very convenient to carry it when you are traveling.

④ Pacifier thermometer: Pacifier thermometer is mainly to facilitate the use of small babies sucking on the milk to measure the temperature with the same shape and the baby with the same pacifier, if you suspect that the baby has a fever, as long as it is put into the mouth of the child sucking can measure the body temperature. ⑤ ear thermometer: This is a thermometer shaped like an otoscope, one end into the ear, pull the "trigger" in a second to learn about the body temperature of the person, respectively, can show the anal and oral temperature of the two kinds of body temperature, but the price is expensive, the general family does not need to use the ear thermometer.

⑥ disposable thermometer: this is the last three or four years, the new imported thermometer, its shape is slightly larger flat, you can correctly measure the temperature of the mouth, only one time on the abandonment of the patient can be avoided to avoid the infection of the disease between patients, but the relative cost is also high.

The thermometer is a new type of thermometer imported in the past.

What are the types of thermometers

Thermometers are a common tool for measuring body temperature in life, and are generally necessary in the home.

The most common thermometers on the market are glass mercury thermometers, electronic thermometers, and multi-function infrared thermometers. Let's take a look at their differences.

Glass mercury thermometer. A mercury thermometer is a traditional thermometer made of glass containing a column of mercury that rises with body temperature.

Mercury thermometers are characterized by accurate measurements, high stability, and low cost. Mercury thermometers contain mercury, mercury is more harmful to the human body, once the mercury vapor is inhaled, it will enter the human body through the blood circulation into the organs and tissues, but also through the blood-brain barrier, damage to the central nervous system.

Mercury is transformed into methylmercury when it enters water bodies, which is especially harmful to developing fetuses and infants. Methylmercury is also enriched in animals and humans as it moves up the food chain, thus threatening our health.

A mercury thermometer contains about 1 gram of mercury, and when broken, all of the leaked mercury evaporates, allowing a room 15 square meters large and 3 meters high to have a mercury content concentration of 22.2 mg/m3, and people in the mercury concentration of 1.2-8.5 mg/m3 will cause mercury poisoning in the environment. Considering the mercury hazards of mercury thermometers, many countries have adopted bans on them.