True density meter performance - Huaqiang Electronic Network

The new generation 3H-2000TD series true density meter launched by Besed can accurately measure the true density of various materials. It has many technical patents and original test methods, which makes its application field wider than similar instruments, and the accuracy of measurement results. Higher, the analytical material has a wider volume range. The instrument is widely used in many research institutes and enterprises including China Aerospace Science and Technology Fourth Hospital, Shenyang Coal Science Institute, Huahai Group, Dow Chemical, etc., and has been well received by customers. Test content: true density, porosity, open porosity, closed cell ratio and other true density meter technical parameters: Test accuracy: accuracy is better than ± 0.04%, repeatability is better than ± 0.02%, resolution: 0.0001g / ml; Test speed: 0.5-1 minute for a single station to complete the entire test process. Double station analysis efficiency doubled; Analysis station: 3H-2000TD1 type: 1 analysis station, test one sample at the same time; Scope of application: sample density is not limited, can measure various powder, granular, block, foam Solid sample such as slurry, non-volatile liquid, etc.; test volume range: 0.01~2000ml; sample cell: sample cell with three different sizes (10ml, 20ml, 50ml); sample cell volume It can be selected from 5 to 500ml, and it is suitable for measuring samples with different sizes ranging from 0.01 to 2000ml. A large volume of sample cell with a volume greater than 150 ml is available; pressure range: 0-1 bar. The user can customize the maximum pressure to reduce the error caused by the deformation of the analytical sample. Test gas: 40 high purity helium, purity ≥99.999%; other gases such as nitrogen are optional; Instrument accessories: valve and pressure sensor Import; true density meter features advantages sample cell installation: the sample cell directly serves as the sample test chamber, which has the advantage of high sample chamber volume utilization compared with similar instruments, thus improving the test accuracy; "bottom mount type" The sample cell can meet the needs of large-volume loading to achieve the purpose of improving test accuracy. (Patent name: sample cell under-loaded true density meter patent No.5); Valve type: air control valve, fundamentally completely eliminates the change of the reference cavity volume caused by the heat generated by the solenoid valve structure of the same instrument, without software correction (Patent name: gas control valve true density meter patent No. 8.); Reference cavity: each analysis station has a built-in 1 reference cavity, 1 expansion cavity; expansion cavity can improve test accuracy for different sample cell volume; The program automatically selects whether to enable the expansion cavity according to the sample cell volume; automatic repeat: it can automatically repeat the test until the specified accuracy is reached; Pressure balance: pressure balance time with automatic default, user selection and user-defined three modes, adapt to the structure State of the sample; Self-test process: advanced intelligent self-test process, intelligently judge whether the sample cell is leaking or the instrument is airtight, and completely solve the human error; restore the normal pressure: with the test to automatically restore the normal pressure function, Prevent sample splashing; Control interface: Graphical control interface with clear image and can be performed on the interface Control operation of all hardware; Power-off protection: Super stability, even if the power is cut off unexpectedly, the current data will not be lost, and the experiment can resume. The memory function: the instrument configures the chip memory function to realize the manual pair. Zero configuration of instrument hardware parameters; Operation log: detailed instrument operation log, time accurate to seconds, this log provides guarantee for reliable operation and after-sale of the instrument; Real-life voice: live voice prompt for each test procedure; Multi-language package: support can be Define the edited multi-language operator interface. Remote control: with network remote control function; true density meter pre-sales and after-sales service: Established a vigorous service team on the service, there are 10 full-time service engineers to provide users with installation and commissioning training services. In order to improve service timeliness and shorten service radius, Bethes Instruments has offices in Shanghai and Guangzhou, and 90% of users can reach the instrument use site within 24 hours. In addition, the company implements a free disclaimer warranty system during the warranty period, a free upgrade system for surface and aperture analyzer software, a regular return visit system, etc., eliminating the worries of users. True Density Instrument Principle: Apply the Archimedes principle-gas expansion displacement method, using the inert gas of small molecular diameter under certain conditions of Bohr's law (PV=nRT), by measuring the sample cavity into the sample The resulting sample test chamber gas volume is reduced to accurately determine the sample's skeleton volume (including closed cells) to obtain its true density, true density = mass / skeleton volume. The gas expansion displacement method is a volume in which a sample is discharged by measuring a liquid by a gas. This method eliminates the possibility that the immersion method dissolves the sample and has the advantage of not damaging the sample. Because the gas can be incorporated into the tiny pores in the sample and the irregular vacancies on the surface, the measured sample volume is closer to the skeleton volume of the sample, which can be used to calculate the density of the sample, and the test value is closer to the true density of the sample. The test system of the instrument consists of a sample test chamber and a reference chamber, as shown in the figure. When measuring the sample density, the instrument automatically collects and records the pressure P1 and the volume V1 of the reference cavity; puts a sample V of a certain unknown volume into the sample test cavity of the known volume V2, injects a certain amount of gas into the reference cavity and records the stability after recording. Pressure P2; connect the sample test chamber to the reference chamber and record the stabilized pressure P3. According to the equilibrium stabilized pressure value and the relevant known volume V1, V2, the sample volume V sample to be tested can be calculated, and then The true density of the sample is calculated from the mass and volume of the sample. The 3H-2000TD series true density meter adopts the most advanced air control valve control structure (patent acceptance number.8) in the industry, which fundamentally completely eliminates the volumetric quantitative error caused by the electromagnetic valve heating caused by the electromagnetic valve of similar instruments. The problem. 3H-2000TD series true density meter has the advantage of high utilization rate of sample test chamber due to the advanced "bottom mount type" sample cell installation method (patent acceptance number.5) and the sample pool directly as the sample test chamber. For a 10ml sample cell, the test chamber volume utilization is higher than 90%; thus the test accuracy for a small number of samples is improved; while the usual sample cell is "top-loaded", the sample cell is loaded into the test bucket and capped. After sealing, the test sample consists of “test bucket + sample cell”. There is a large amount of unused space in the test chamber, which makes the test chamber volume utilization low. For the 10ml sample cell, the test chamber volume utilization is less than 10%; The accuracy of testing for a small number of samples is difficult to guarantee. On the other hand, the volume of the “top-loading and capping” sample cell is limited by the volume of the covered test drum, and it is not suitable for large-volume loading (it is difficult to meet the loading of more than 150ml volume), and the “bottom mount type” The sample cell can meet the needs of large-volume loading, and the upper limit of loading can reach more than 500ml, so as to broaden the test range, expand the applicable surface, and improve the test accuracy.