DVS Vacuum

Dynamic Dual Vapor/Gas Vacuum Gravimetric Sorption Analyzer

The world’s most versatile Vacuum DVS for the measurement of kinetics and physisorption isotherms of Zeolites, MOFs, COFs, Carbons, and composite materials.

DVS Vacuum offers dynamic or static sorption or co-adsorption experiments from low pressures up to 1bar. The system’s key features are precise control and measure of temperature and pressure while recording the changes in sample mass using high-resolution UltraBalace.

DVS Vacuum uses vacuum produced by combination of roughing and turbomolecular pumps for its operation – in-situ outgassing of sample up to 400oC and water or organic vapors generation at the set temperature. The vacuum chamber including sample, pressure transducers, vapor/gas delivery system and solvent flasks are at thermal equilibrium in a single temperature enclosure allowing smooth operation over the entire temperature range (20-70°C) without risk of condensation. The system introduces partial pressures of water or organic solvent under vacuum to minimize their impact on the structure of a material. The analyser measures true water or organic vapor sorption isotherms without unnecessary interference from a carrier gas. In addition, it allows to study drying kinetics of pharmaceutical powders.

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Outstanding Performance

Long Term Temperature Stability

  • Vapor generation and delivery manifold at sample temperature
  • Prevents condensation issues found in instruments with multiple temperature zones

Pressure measurements

  • Direct, Gas Independent, High Accuracy Pressure Measurement

Mass Measurements

  • Excellent balance Baseline Stability over 24 hours
  • Mass changes at a resolution of 0.01 μg
  • Root mean square noise of ≤ 0.3 μg

Key measurement capabilities:
  • In-situ sample outgassing at temperatures of up to 400 °C and high vacuum (≤10-6 Torr)
  • In-situ drying curves of pharmaceutical materials at various pressures and temperatures
  • Real-time adsorption / desorption kinetics
  • Adsorption / desorption IsoTherms (T constant, P variable)
  • Adsorption / desorption IsoBars (T variable, P constant)
  • ‘apparent’ BET (Brunauer, Emmett and Teller) Surface Area
  • Diffusion coefficients
  • Heat of Adsorption
  • Dynamic Competitive Adsorption of two probe molecules (e.g. CO2 – H2O, Toluene – H2O, MeOH – H2O)
  • Binary competitive adsorption of one probe molecule at constant loading of other probe molecule
  • Multiple adsorption/desorption and sample regeneration cycles

1. Temperature
  • Temperature controlled enclosure
  • Control range: 20°C to 70°C
  • Regulation accuracy: ±0.2°C
  • The enclosure also provides anti-condensation protection
2. Weight measurement
  • High-Resolution microbalance
  • Sample mass: between 1 and 1000mg
  • Mass change: ±150mg
  • Resolution (precision): 0.1 μg
  • Peak to peak noise: ≤ 0.3 μg
3. Pressure measurement
  • 1000 Torr Baratron full scale from 0.01 up to 1000 Torr (standard)
  • 10 Torr Baratron: full scale from 0.005 up to 10 Torr (standard)
  • Other ranges available upon request (100 and 500 Torr)
  • Accuracy: ±0.5 of Reading
  • Resolution: 0.01% of full scale
4. Vacuum pressure measurement Vacuum pressure transducer: full scale from 1×10-8 Torr up to 760 Torr
5. Computer hardware and software The system is fully automated and controlled by purpose-built software. Data can be analyzed in real time using analysis software.