It is a kind of thermometer. It uses the principle of infrared transmission of digital to sense the surface temperature of the object. It is convenient to operate, especially the measurement of high temperature objects. Wide range of applications, such as steel casting, furnace temperature, machine parts, glass and room temperature, body temperature and other surface temperature measurements. At present, more infrared thermometers are used. There are three main types of infrared temperature measuring instruments: infrared thermal imaging cameras, infrared thermal televisions, and infrared thermometers (point thermometers).
maintain
1. Replace the battery
To install or replace the battery, open the battery compartment and insert the battery as shown in Figure 2.
2. Cleaning lens
Use clean compressed air to blow off the falling particles. Carefully wipe the surface with a damp cotton swab. The cotton swab can be moistened with water.
3. Clean the case
Soak a sponge or a soft cloth with soap and water. To avoid damage to the thermometer, never immerse the instrument in water.
Thermometer classification
With the development of science and technology and the needs of modern industrial technology, temperature measurement technology is constantly improving and improving. As the temperature range is wider and wider, different temperature measuring instruments are manufactured according to different requirements. Here are a few.
Gas thermometer
Hydrogen or helium is often used as a temperature measuring substance, because the liquefaction temperature of hydrogen and helium is very low, close to absolute zero, so its temperature range is wide. This thermometer is highly accurate and is used for precision measurements.
Resistance thermometer
Divided into a metal resistance thermometer and a semiconductor resistance thermometer, both are based on the characteristic that the resistance value changes with temperature. Metal thermometers are mainly made of pure metals such as platinum, gold, copper, nickel, and bismuth iron or phosphor bronze alloys; semiconductor thermometers mainly use carbon and germanium. Resistance thermometers are easy to use and have been widely used. Its measurement range is from -260 ° C to 600 ° C.
Far infrared thermometer
ST60 ring laser aiming, 0.1°C display, adjustable emissivity, high/low temperature alarm, data re-adjustment, maximum, minimum, difference, average display, D: S=30:1, store 12 measurement points data . SM series °C/°F temperature unit conversion, data hold display function, auto power off function, backlight display selection function, laser target display selection function, average and temperature difference measurement function, maximum and minimum measurement function, measurement data storage function (power off Memory), response time and response value are long and repetitive.
Thermocouple thermometer
It is a kind of temperature measuring instrument widely used in industry. Made using the thermoelectric phenomenon. Two different wires are welded together to form a working end, and the other ends are connected to a measuring instrument to form an electric circuit. When the working end is placed at the temperature to be measured and the working end and the free end temperature are different, an electromotive force will appear, so that a current flows through the circuit. The temperature at another location can be determined by measuring the electrical quantity using the temperature at a known location. This kind of thermometer is mostly composed of copper-constantan, iron--constantan, nickel--constantan, gold-cobalt--copper, platinum--anthracene. It is suitable for use between two substances with large temperature difference, and is mostly used for high temperature and low turbidity measurement. Some thermocouples can measure high temperatures up to 3000 °C, and some can measure low temperatures close to absolute zero.
High temperature thermometer
It is a thermometer specially used to measure temperatures above 500 °C. There are photometric thermometers, colorimetric thermometers and radiation thermometers. The principle and construction of high temperature thermometers are complex and will not be discussed here. Its measurement range is from 500 ° C to 3000 ° C, not suitable for measuring low temperature.
Pointer thermometer
It is a thermometer like a dashboard, also known as a thermometer. It is used to measure room temperature and is made by the principle of thermal expansion and contraction of metal. It uses a bimetal as a temperature sensing element to control the pointer. Bimetals are usually riveted together with copper and iron, with the copper on the left and the iron on the right. Since the thermal expansion and contraction effect of copper is much more obvious than that of iron, when the temperature rises, the copper piece pulls the iron piece to the right, and the pointer is deflected to the right under the action of the bimetal (pointing to high temperature); The temperature becomes lower and the pointer is deflected to the left (pointing to low temperature) under the action of the bimetal.
Glass tube thermometer
Glass tube thermometers use the principle of thermal expansion and contraction to achieve temperature measurement. Because the expansion coefficient of the temperature measuring medium is different from the boiling point and freezing point, our common glass tube thermometers are: kerosene thermometer, mercury thermometer, red pen water thermometer, alcohol thermometer, etc. His advantages are simple structure, easy to use, relatively high measurement accuracy and low price. The disadvantage is that the upper and lower limits of measurement and accuracy are limited by the quality of the glass and the properties of the temperature measuring medium. And can not be passed far, fragile.
Pressure thermometer
The pressure thermometer uses a liquid in a closed container, and a gas or a saturated vapor is heated to generate a volume expansion or a pressure change as a measurement signal. Its basic structure consists of three parts: the warm pack, the capillary and the indicator. It is one of the first methods used in the temperature control of production processes. The pressure temperature measurement system is a widely used measurement method for local indication and control of temperature. The advantages of the pressure thermometer are: simple structure, high mechanical strength, and no fear of vibration. The price is low and no external energy is needed. The disadvantages are: the temperature range is limited, generally -80~400 °C; the heat loss has a slow response time; the instrument sealing system (warm pack, capillary tube, spring tube) is difficult to repair and must be replaced; the measurement accuracy is affected by the ambient temperature, The temperature package installation position has a large influence and the accuracy is relatively low; the capillary transmission distance is limited. The working range of the pressure thermometer should be in the range of 1/2--3/4 of the measurement range, and the display meter and the temperature pack should be placed in a horizontal position as much as possible. The installation of the thermostat mounting bolts will cause the temperature to be lost and the temperature will be inaccurate. The installation should be insulated and the temperature should be kept in a vibrating environment.
Rotary thermometer
The rotary thermometer is made of a crimped bimetal. The bimetal is fixed at one end and the other end is connected to the pointer. Due to the degree of expansion of the two metal sheets, the degree of curling of the bimetal is different at different temperatures, and the pointer is then pointed to different positions on the dial, and the temperature is known from the reading on the dial.
Semiconductor thermometer
The resistance change of a semiconductor is different from that of a metal. When the temperature is raised, the resistance is reduced and the variation is large. Therefore, a small amount of temperature change can also cause significant changes in the resistance, and the resulting thermometer has a high degree of precision, often referred to as a temperature sensor. Stainless steel electrode
Thermocouple thermometer
The thermocouple thermometer consists of two sensitive metals connected to a sensitive voltmeter. Metal junctions produce different potential differences across the metal at different temperatures. The potential difference is very small, so it needs to be measured by a sensitive voltmeter. From the reading of the voltmeter, you can know the temperature.
Photometric pyrometer
If the temperature of the object is high enough to emit a large amount of visible light, the temperature of the object can be determined by measuring the amount of heat radiation. This thermometer is a photometric thermometer. The thermometer is mainly made up of a telescope with a red filter and a set of circuits with small bulbs, ammeters and variable resistors. Before use, first establish the relationship between the temperature corresponding to the different brightness of the filament and the reading on the ammeter. When using, the telescope is aligned with the object to be tested, and the resistance is adjusted so that the brightness of the bulb is the same as that of the object to be tested. At this time, the temperature of the object to be tested can be read from the ammeter.
Building electronic thermometer
It can be used with the temperature probe to measure the temperature of materials and clinker, such as gas, liquid, fluid, mixture and granular materials. It can be used with the embedded temperature measuring line to measure the internal temperature of concrete and mass concrete in winter.
LCD thermometer
Liquid crystals made with different formulations have different phase transition temperatures. When their phase changes, their optical properties also change, making the liquid crystal look colored. If liquid crystals with different phase transition temperatures are applied to a piece of paper, the temperature can be known by the change in the color of the liquid crystal. The advantage of this thermometer is that it is easy to read, but the disadvantage is that it is not accurate enough. It is often used in ornamental fish tanks to indicate water temperature.
LCD thermometer
LCD thermometer
When using a mercury temperature agent, you should pay attention to the problem:
1. Before using it to measure our body temperature, you should carefully check it to see if the measured temperature is accurate;
2. If the temperature of the subject is higher than the highest temperature that can be measured, then you cannot use this temperature agent to measure the temperature of the subject;
3. Generally speaking, all temperature agents are very sensitive to heat and have their inertia. You can accurately tell the temperature when it is in a stable state. When reading the temperature, the line of sight should be liquid. The scale of the surface is parallel;
4. If you accidentally get damaged (broken), you can use the following two methods to minimize the damage of mercury to the human body.
One of the methods: cold repair method to insert the damaged temperature agent into objects with extremely low temperature, such as alcohol, the maximum temperature can not exceed -38 ° C, so that the mercury in the temperature agent will return to the temperature measurement bubble due to low temperature. Inside, it will not cause damage to the human body;
Method 2: The hot repair method puts the damaged temperature agent into the thermostatic bath whose temperature is higher than its maximum temperature. At this time, the broken mercury will be connected in a straight line inside, then you can slowly take the thermometer Come out, in the air, it will slowly cool, then the mercury will drop to the room temperature scale.
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