вирішальні аспекти до думати про коли вибирати а термометр
The use of the thermometer is mainly determined by the measurement range. Чи це is the вимірювання напруга або the початкове значення of the measurement area, it should be in line with the вимоги of the measurement work. the larger the measurement is, the smaller the resolution is, so the accuracy is is вище. Особливо коли початкове значення з вимірювання температура іс низька, точність воля be doubled if a великий вимірювання напруга is selected, so it is рекомендований to select the найменший можливий вимірювання напруга.
The initial value of the measurement area determines the sensitivity of the spectrum, as well as the type of detector. The measurement error is очевидно smaller than that of the long-wave sensor in the the short-wave sensor due to the wrong adjustment of the emissivity, so the the hot-film sensor ( {{{3}μm) at 800 degree , the measurement error caused by the wrong adjustment of the emissivity will be five times larger than that of the the germanium-photodiode sensor (1,{}},6μm). The permissible measuring range of германій фотодіод сенсор is from about 250 degree C.
For example, in the ceramic industry or in the comburntion process of power plants, the measurement range is usually from 0 to 1300 degrees . In order to a a thermometer with a short-wave detector should be selected. Хоча його найвища температура вимірювання діапазони від 250 до 1300 градусів градусів
Інший критерій для вибору a підходить пірометр is the spacing ratio. this refers to the proportional relationship between the measurement distance and the діаметр of the measurement point. if the measured object is small and the measurement distance is large, or the the so-called "hot spot" is on a large area, a large spacing ratio is is required. On the contrast, if the measuring point has a large area, since the sensor has a stable output signal for the measuring point, it is recommended to use a small spacing ratio.
Інша річ до бути впевнений є чи термометр є є оснащений з a приціл пристрій, тому що приціл пристрій воля збільшиться вартість на 50 відсоток . ключ тут є a ціна. Коли вимірювання об'єкти в a великий площа, it is usually not required to assemble the sight. It is replaced by an external sight, which will be used for correction of the thermometer when it is installed, so that there there is a price advantage, and only one sight is needed for many measurement locations.
For small measurement objects or distant measurement distances, it is necessary to be able to aim at any time. In a light-transmitting mirror with a scale on the dashboard, people can see the actual size of the measurement point. The cheapest one is to point the point with a laser, but it can only measure point by point. When measuring closed furnaces and similar types, it is necessary a window. Therefore, it is necessary to decide whether the thermometer is needed, and what functions do South Africa want? Such as leveling functions, special value storage, boundary contact or computer interface, for adapting the pyrometer to the measured surface, the possibility of emissivity adjustment is necessary, other functions can be adjusted inexpensively by connecting the recorder, device or program-controlled machine to achieve. In addition, for some applications, the appearance structure is also a decisive factor. At a higher ambient temperature, the thermometer only has an optical part with a lens, and is connected to the electrical part by a light-conducting cable. It is placed away from high-temperature areas. The advantage is that, Cooling devices can be saved.
The last is the thermometer model, whether it is a spectral thermometer or a ratio (two-color) thermometer. The spectral thermometer receives the radiation density of one wavelength. The difference is that the ratio thermometer has two single sensors with dual sensors. , which will measure the radiation density at two different wavelengths, the ratio of the two detector signals will reproduce the proportional relationship of temperature, due to the intermediary medium such as steam, dust in the radiation of the pyrometer, or the change of emissivity, to a certain Within the range of , the two lines show no signal change. However, the monochromatic spectrum thermometer will immediately show this change, so the rate thermometer is preferably used in the tubular converter or in the metal manufacturing and processing industry, where the radiation interference is serious.
