Key criteria for choosing a pyrometer
The use of the pyrometer is mainly determined by the measurement range, both the measurement voltage, or the beginning of the measurement area, should be in line with the requirements of the measurement work, the larger the choice of the measurement voltage, the resolution will be small, and thus the accuracy is poor, especially in the beginning of the low measurement temperature, the choice of a large measurement voltage, the accuracy will be multiplied by the reduction, and therefore it is worthwhile to recommend the choice of the smallest possible measurement voltage.
The starting value of the measurement area determines the sensitivity of the spectrum, and even the type of detector, the measurement error due to the error adjustment of the emissivity, in the short-wave sensor is significantly smaller than that of the long-wave sensor, so in the hot-film sensor (8 to 14 μm) 800 ℃, due to the emissivity of the error caused by the adjustment of the measurement error will be five times greater than the germanium-photodiode sensors (1,1 ~ 1,6 μm). 6μm). The permissible measuring range of germanium-photodiode sensors starts at approx. 250 °C.
For example, in the ceramics industry or in combustion processes in power plants, the measuring range is usually from 0 to 1300 °C. The measurement range is usually from 0 to 1300 °C. In order to avoid large errors, a pyrometer with a short-wave detector should be used. Even though it has a high temperature range from 250 to 1300 °C.
Another criterion for selecting a suitable pyrometer is the pitch ratio. Here refers to the measurement distance and the diameter of the measurement point of the proportionality of the relationship, if the measured object is small, the measurement distance is large, or the so-called "hot spot" in a large area, then the need for large spacing ratio. On the contrary, if a large area of the measurement point, due to the sensor on the measurement point is between the value of a stable output signal, the solid selection of small spacing ratio.
Another thing to determine is whether the pyrometer with a sighting device, because the sighting device will increase the cost of 50%, here is the key to a price of the Department, in the large area of the measurement of the object, usually can not be assembled into the sighting, instead of an external sighting, it will be used for pyrometer in the installation of the corrective, so that there is a price advantage of a large number of measurements only need a sighting.
