JW-M100A Fully Automatic True Density/Open/Closed Pore Rate TesterUsing the principle of gas displacement, it is an upgraded version of the JW-M100 true density meter. This instrument fully adopts the core technology of American microphone, with a unique, simple, and generous exterior structure design, LCD screen full touch all-in-one display and control, modular design, unique constant temperature device, and powerful software analysis technology, making the product more comprehensive. The accuracy, precision, and stability of test results fully reach the level of imported instruments, and the cost-effectiveness is extremely high.

Determination methods for open porosity and closed porosity

1). Related definitions
Theoretical density (ρ): weight divided by volume without any pores;
True density (∼ true): The weight divided by the volume including blind holes. When the powder is fine enough, the true density is close to the theoretical density;
Visual density (ρ): After a certain sintering process, bulk materials are first processed into standard sized samples, and their weight is divided by the volume calculated from their external dimensions, which is called visual density. Its volume includes the volume of open and closed pores;
Block true density (〇 block true): The true density of porous block materials is measured, and their volume contains a significant closed cell volume;
2). Porosity calculation
Open porosity: percentage of open pore volume to total volume
ε open=[(1/ρ view) - (1/ρ block truth)]/(1/ρ view);
Closed porosity: percentage of closed pore volume to total volume
ε closure=[(1/ρ block truth) - (1/ρ theory)]/(1/ρ view);
If the theoretical density cannot be obtained, the sample can be ground into fine powder to eliminate blind holes, and the true density of the fine powder can be measured instead of the theoretical density, and the closed pore porosity can be calculated from the above formula

Product features and advantages
The testing accuracy and repeatability fully meet international standards: the testing accuracy is ≤± 0.03%, and the repeatability is ≤± 0.01%;
● The instrument has true density, true volume, skeleton density, porosity and other testing functions, and can accurately test the open porosity and closed porosity of regular solid materials such as blocks and foam materials;
● Standard configuration includes one analysis station, with two different pool volumes of 10ml and 100ml to choose from; Among them, the 100ml volume analysis station comes standard with three different volumes of metal sample tanks;
Test gas: helium or nitrogen;
The containerized and modular cavity structure design effectively improves the temperature uniformity of the entire testing system, which is very suitable for the accuracy requirements of true density meter testing;
● Room temperature testing, equipped with international * * testing system constant temperature technology to ensure high repeatability of test results;
Equipped with international * * * precision processing and sealing technology, ensuring that the entire testing system is completely leak free, greatly improving the accuracy of test results;
The instrument all-in-one design is lightweight, compact, and features a high-quality full touch LCD display for operation and control, without the need for additional computer configuration, making it simple and convenient;
The operating software is completely independently developed, with fully automated testing. Sample testing takes about 3-5 minutes to complete once, and the number of repeated tests can be automatically set;
The instrument is equipped with an intelligent self checking program that can automatically determine the sealing of the testing system and eliminate human operation errors;
Instrument specifications: 380mm x 280mm x 280mm;
● Power supply requirements: AC 220V ± 20V, 50Hz, power 100w;