Water & Organic Vapor Sorption Analyzers

The Vstar is available in two, or four station models, each of which is available with a variety of options. The ability to analyze up to 4 samples simultaneously (on the Vstar 4) provides unprecedented throughput; superior manifold temperature control ensures the highest accuracy; independent sample temperature control (with additional circulators) and wider sample temperaturerange provide maximum flexibility; and a high-vacuum option enables analysis of microporous materials.

Dosing manifold and vapor source in single thermostatically controlled chamber Ethernet Port for PC control via Windows® based software Interlocked door to prevent opening during experiment Cold trap to prevent vapors from entering the pump Easy loading and unloading of samples

The VSTAR vapor sorption analyzer goes beyond water sorption to provide vapor sorption analysis using a wide variety of organic vapors at a wide range of temperatures. Meticulous control of the manifold temperature from the vapor source to the sample eliminates the possibility of local condensation of the adsorptive and ensures the most accurate analysis possible. The VSTAR measures complete adsorption-desorption isotherms, i.e., the quantitative uptake of vapor as a function of relative pressure / relative humidity at a user-selectable, thermostatically controlled temperature. Such measurements are of critical importance to material scientists developing adsorption based technologies for chemical process and environmental applications.

Dynamic Vapor Sorption

Temperature Control

Each VSTAR comes standard with a circulating bath, capable of controlling the sample temperature of one to four samples from –20°C to 100°C with a thermal stability of ±0.01°C. The low limit of the temperature range can be extended to –40°C and/or the precision of the control can be increased to ±0.005°C with optional circulators. Additional circulators can be added to allow completely independent temperature control of each sample in a multi-station system.

Superior manifold temperature control from the vapor source to the sample eliminates the possibility of local condensation of the adsorptive and ensures the highest accuracy.

High Throughput

The VSTAR is available in two, or four station models, each of which is available with a variety of options. The ability to analyze up to 4 samples simultaneously (on the VSTAR 4) provides unprecedented throughput.

VstarWin Software

All aspects of the instrument control and data acquisition are controlled via a user-friendly software package. In normal operation the status of all valves, sensors, pumps, etc. can be viewed at a glance on the controlling PC. For diagnostic purposes a password protected manual mode allows control of all valves, pumps, and heaters with the click of a mouse button.

Intuitive dialogs allow programming flexible degas protocols and defining all acquisition parameters, from point selection to analysis temperature. Predefined protocols can be saved and used on a series of samples to ensure uniform analysis.

Acquired data can be displayed and printed or copied into reports and other documents. Basic data processing routines such as BET surface area and Dubinin-Radushkevich are built into the basic software. Data can be exported to spreadsheets or VersaWin Quantachrome’s powerful physisorption data processing package for additional display and processing options.

SPECIFICATIONS