What is moisture calibration?
moisture calibration involves checking the accuracy and correct adjustment of the sensors that measure the moisture content in the air. These measurements are critically important in many laboratory and manufacturing processes. The accurate calibration for relative humidity (RH), the amount of humidity in the air compared to the maximum, which it can hold at a certain temperature, is particularly difficult. A small change in the surrounding area can change the value, even if the moisture content remains the same. The correct calibration of the moisture of monitoring devices helps ensure that the environmental conditions remain within the required specifications for a reliable time.
Hygrometers are a device used to measure moisture. Most of them measure the quantity such as temperature, atmospheric pressure or changes in electrical properties that are sensitive to moisture change. Usually these measurements indicate the humidity value compared to the standard link. One diffractive in calibration is generation accurate and stable relative humidity outside a special laboxAtoř.
A suitable and widely used moisture calibration method includes saturated salt solutions. The data was compiled on the properties of 28 different salt solutions that cover the entire range of RH values. In this process, the lower part of the airtight box is covered with a saturated saline solution that creates a relative humidity in the space above it with adequate accuracy. The RH value depends on the salt used and is largely independent of temperature. However, the uniformity of the temperature in the frame is necessary.
Infatuited salt solutions can also be used to create a certain relative humidity. In this case, the produced values of RH depend on careful control of salt concentration and ambient temperature. As in the above method, the measuring device is supported in the space above the moisture calibration solution. Once the required RH value is generated, the device read and edit can be recorded.
by another methodThe dry air flow at 0% Rh is directed into two flows. One is saturated with water vapor up to 100% rh. The relative humidity in the measuring chamber can then be adjusted by mixing two flows with the mass flow control (MFC), a tool used to control the gas flow. Although this method allows moisture calibration to a number of levels, it is dependent on the correct calibration of MFC.
Implementation of saturated salt method is often sold in the form of a set to companies without resources to establish an internal laboratory or contract with a calibration company for the instrument. However, pharmaceutical companies, microelectronic manufacturers and research laboratories depend on narrowly regulated environments. On these pages, the calibration of professional humidity and a regularlyimpring procedure.