What are Moisture Analyzers and How do They Work?
A moisture balance, also called a moisture analyzer, measures the amount of moisture in a substance. This is particularly helpful in food processing lab consumables as the amount of moisture can be an indicator of freshness and quality for some foods. These analyzers are also commonly used in environmental, pharmaceutical, and materials science labs. There are several techniques that may be used to measure moisture. Some techniques used include measuring water vapor released following combustion of the sample, measuring the difference in weight after removal of moisture from the sample, and measuring the equilibrium of water vapor of the sample in a closed system. Some things to take into consideration when purchasing a moisture analytical balance include capacity, precision, speed, method of measurement, software, and whether the samples to be measured come in solid or liquid form.
Moisture analyzers, sometimes called “moisture balances”, are used to measure the moisture content in various types of samples including solids, liquids, and gases. Trace moisture in solids must be controlled for plastics, pharmaceuticals and heat treatment processes. Gas or liquid measurement applications include dry air, hydrocarbon processing, pure semiconductor gases, bulk pure gases, dielectric gases such as those in transformers and power plants, and natural gas pipeline transport.
Due to the slow pace of traditional and manual laboratory moisture testing methods, automated moisture analyzers have been developed and can reduce the time necessary for a test from hours to just a few minutes.
Moisture analyzers are utilized in different industries for many different purposes. They can be used in food industry to control the moisture. Excess amount of moisture in food may lead to staleness or bacterial growth. Furthermore, there are many food items which are sold by their weight; thus, it is important to make sure customers aren’t overpaying for water weight. On the other hand, too little moisture can reduce the calorie count or make the food dry. Moisture is an important factor affecting the consistency, taste, shelf appearance and many other factors in food.
Moisture analyzers, as industrial weighing scale, are also frequently used in quality control and other laboratories. Moisture analysis is used in many fields to determine the water content in crude oil, fuel, sewage sludge and many other chemicals, solids and liquids.
Most moisture analyzers have a computer interface to assist with the observation and analyse in the drying process and its effects on the sample. They have the capacity to save the tests in their memory to repeat frequent testing parameters without having to set them up over and over again to assist with the elimination of down time.
How moisture analyzers work
Moisture analyzers utilize Loss On Drying (LOD) method to measure moisture. In this method, the moisture analyzer weighs a sample, heats it up to dry it, and weighs it again once it’s dry. The weight after drying is subtracted from the weight before, so the loss of moisture is determined using the loss of mass.
The heat generating system can vary from analyzer to analyzer. Some moisture analyzers use halogen and some use infrared or glass-free metal heaters positioned above a precision electronic balance. Halogen moisture analyzers are quick, efficient and responsive. These types of moisture analyzers are ideal to use where there is no single setting that heats all samples evenly.
Density balances decide the density in liquid and solid materials as per the buoyancy method. Density balances are mainly electronic, maintain accuracy and beneficial to know the density in ceramics, glass, rubber, plastics, sintered metals and other non-metallic materials.
The method of density determination, like textile balance, is denoted by high veracity and quick results. Liquid Density is measured via the buoyancy test with the glass element. On the other hand, the density in solid materials is decided by using the weight and volume of a sample.
In Density Balances, the weighing unit determines the weight. The density of the Liquid must be ensured prior because the volume is obtained when the pressure of the sample is put in the liquid
The process of selecting chromatography sample vials for your laboratory can be complicated because there are many factors to consider as well as numerous options to choose from. This article offers guidance by providing an overview of chromatography vial options and how each can suit specific needs.
When choosing a chromatography vial, the product material is of paramount importance. Depending upon the use, either glass or plastic testing vials may be best. Begin by considering the facts and benefits regarding glass ultra clean vials.
Glass vials are pure, meaning they have no traces of contaminants within their components, for example metal, which could potentially interfere with an experiment. Glass is also heat resistant, which is vital because glass chromatography vials may be heated to over 500 degrees Celsius. That makes glass vials a common choice for many labs.
Plastic vials have their own set of specifications and benefits. It is important to note that the type of plastic makes a difference in the storage vial and its uses. Plastic vials can be made of either polypropylene or poly methyl pentene (PMP). Polypropylene is the most popular plastic material available. To put it in perspective, the recyclable containers you store your dinner leftovers in are commonly made of this as well as the plastic lid on a box of Tic Tacs. Polypropylene vials have a heat resistance of up to 135 degrees Celsius, are translucent and are used commonly in chromatography experiments.
PMP has a higher heat resistance—up to 175 degrees Celsius—and is transparent, which increases visibility of the sample within the vial. Aside from scientific uses, PMP is used in the making of cookware, microwave components and even some windows.
Plastic vials provide the benefits of good chemical resistance, light weight construction, durability and affordability.
- Creado: 03-09-21
- Última sesión: 03-09-21