In industries and laboratories, and especially in the production environment, there is often a need to find the amount of moisture in a certain samples. Moisture analysis is done both in bulk and in smaller samples for a variety of reasons, like for quality assurance, heat transfer processes and more.
Moisture analysis is also very important in the pharmaceutical industry, gas production industry, pure gas or semiconductor gas manufacturing, or even in case of transporting natural gases. The humidity or the presence of moisture in these gases need to be tested. Moisture analysis or humidity analysis is done in all of solid, liquid and gaseous samples. What a Moisture Analyzer Does Generally, moisture analyzers are small desktop devices. They can also often take larger form factors depending on the industry requirements and the implementation. These devices are both programmable and can be used manually. In these devices, some samples are dried and the amount of moisture or water removed from the sample is analyzed. Based on the amount of water that is lost, the amount of moisture that was in the sample can be known. Generally, these devices are not used for bulk drying since they are done in separate industrial ovens. Bulk analysis, however, can be done using special forms of moisture analyzers. Usually, the sampling of a small amount of material can tell to how much heat industrial ovens or boilers should provide to boil the bulk amounts. Working Principle There are two main methods in which moisture analyzers work. One is Loss of Drying, commonly called LoD in short. The second one is Karl Fischer titration. LoD is the most commonly used method for moisture analyzers. Moisture analyzers are basically two devices coupled together, a heater and a very accurate balance to weight the mass of a sample. The heater, usually halogen heaters, or even microwave heaters, when powered up will heat up the sample and over time, the water will evaporate and this will lead to a reduction of mass of the sample. The mass before drying and the mass after drying is compared, and the mass lost was the amount of moisture in the sample. Specifications for Moisture Analyzers To buy a moisture analyzers, you need to know a couple of specifications. The primary one is called Resolution. This determines the smallest weight difference that the balance can report. Usually, it is at 0.001 grams. Next is the maximum weight it can measure, the drying profiles available and the maximum temperature tolerance.
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