Nusselt Gap Transparency Ultra Low Saturation Vapor Pressure Analyzer

BSD-PWPNusselt Gap Transparency Ultra Low Saturation Vapor Pressure Analyzer

Product Overview:

With the rapid development of fields such as petrochemicals, pharmaceuticals, and environmental protection, there is an increasing demand for low vapor pressure data among researchers. For example, the storage of pesticides and fertilizers, the manufacture of essence and spices, and the prolongation of the life of plasticizers in rubber and plastic, etc. The design and development of these products all need the low vapor pressure data of pure substances, so it is very important to test the low vapor pressure.

Test Principle

At present, the commonly used methods for measuring low vapor pressure include the flow escape method, the Nusselt torque clearance method, and the Nusselt mass clearance method.

The basic principle of the Nusselt method is to place the substance being tested in a Nusselt box with a high vacuum (absolute pressure less than 10-2P a) outside the box. When heated to a certain temperature, the diffusion of sample vapor reaches dynamic equilibrium, and vapor molecules will diffuse outward from the small hole at a constant rate. The vapor pressure of the substance can be calculated by measuring the diffusion rate dm/dt of the diffusing gas, or by measuring the rotation angle caused by the formation of torque by the diffused gas. The former is called the Nusselt mass gap method, and the latter is called the Nusselt torque gap method.

The Nusselt mass gap method is suitable for measuring low vapor pressure, especially for measuring the vapor pressure of some non-volatile solids at high temperatures. The upper limit of the Nusselt mass gap method is 100Pa, while the lower limit can reach 10-3Pa, making it one of the widely used methods for measuring low vapor pressure.

Nusselt Gap Transparency Ultra Low Saturation Vapor Pressure Analyzer

Performance Parameters

Testing function: It can test the vapor pressure of low vapor pressure substances such as solids, liquids, and oils; Can perform vacuum thermogravimetric analysis;

Steam pressure test range: 100Pa~10E-8Pa;;

Analysis and testing temperature range:

Room temperature~300 ℃; Optional lower limit one: -10 ℃; Optional lower limit 2: -180 ℃; Optional upper limit: 600 ℃; Optional upper limit 2: 900 ℃;

Analysis stations: 2/4 analysis stations, capable of analyzing 2/4 samples simultaneously

Micro weighing system: 10-1000mg, resolution 1ug

Vacuum system: two-stage mechanical pump+turbo molecular pump: ultimate vacuum 1 * 10-4Pa

Temperature control method: 32 stage programmed heating to prevent overheating and protect the sample.

System constant temperature: room temperature~60 ℃, accuracy better than ± 0.2 ℃, stability better than 0.1 ℃.

Blank reference synchronous testing: eliminates system errors and improves testing accuracy.

Volatile speed test (optional)

The weight loss rate under dynamic flowing atmosphere (nitrogen or air) at a constant temperature can be upgraded and selected to simulate and evaluate the consumption and volatilization rate of low volatile substances such as spices and fertilizers in actual usage environments.