Vapor Pressure Analyzer
Knudsen Effusion Method
Employing the Knudsen Effusion Method, an advanced dynamic gravimetric technique, the Vapor Pressure Analyzer (VPA) is an unparalleled tool for labs seeking to measure the vapor pressure of solids, liquids, and oils.
With unique hardware & engineering features, this powerful machine is employed by researchers around the world to gain accurate, detailed the vapor pressure measurements essential to product development and formulation in a range of industries, from agriculture to pharmaceuticals.
The vapor pressure is an important material physical property that defines the amount of vapor phase material that exists in equilibrium with the original material. All materials enter the vapor phase by sublimation (solid–gas) or evaporation (liquid–gas).
The Knudsen effusion method is based on the rate of escape of vapor molecules through an orifice of known dimensions in a Knudsen cell into a vacuum at a known temperature. The rate of mass loss through the orifice is measured by the Surface Measurement Systems’ UltraBalance within the VPA system. The vapor pressure of a material at thermodynamic equilibrium is a fundamental property of the material and is only a function of temperature.
The incubator provides a controlled and stable temperature environment for experiments.
Range: 20 °C to 85 °C
Stability: ±0.2 °C (20 °C to 85 °C)High-temperature pre-heater
The local sample pre-heater heats the sample up to 400 °C.
The rotary pump can produce minimum vacuum pressure of 1 x10-3 Torr.
Turbomolecular pump in combination with rotary pump provides lower vacuum pressure down to 1x 10-7 Torr.
Ultimate vacuum pressure is measured using a vacuum transducer operating in the range from 900 to 1×10-8 Torr.
Constructed primarily of 316 stainless steel for chemical inertness, KF flanges
and VCR-sealed (Cu) fittings
Measures the sample mass in real-time at a given temperature and high vacuum.
Sample mass: up to 1.0g
Mass change: up to ±150mg
Resolution (precision): 0.1 μg
Peak to peak noise: ≤ 0.7 μg