DVS Resolution
Description
Surface Measurement Systems
The world’s most advanced DVS Instrument, DVS Resolution is a dual vapor gravimetric analyser, with key feature, is the combined ability to precisely control and measure temperature and relative humidity while recording the highest resolution changes in mass. DVS Resolution uses a dry carrier gas typically nitrogen or compressed air for its operation. Digital mass flow controllers regulate flows of dry and saturated gases.
Relative humidity is generated by precisely mixing dry and saturated gas flows in desired flow ratios which produce expected relative humidity. In a typical experiment a known concentration of water vapor is delivered over a sample placed inside the sample pan connected to the Surface Measurement Systems UltraBalance™ measuring realtime mass changes caused by sorption or desorption of water molecules. Prior to sorption measurements, the sample can be in-situ preheated/dried at temperatures of up to 200 oC.
Additionally, the sample chamber and water vapor generation are at thermal equilibrium in a single temperature enclosure allowing for operation over the entire temperature range (5-85°C) without risk of condensation.
Key Differences
< click here
Outstanding performance
Long Term Temperature Stability
Vapor generation and delivery at sample temperature
Typical stability at 25 °C is ±0.02 °C
Prevents condensation issues found in instruments with multiple temperature zones
Allows for accurate and stable humidity delivery
Humidity Performance
±0.1% RH of target humidity
Highest level of humidity precision in any instrument we’ve ever produced
Balance Baseline Stability over 24 hours
Mass changes at a resolution of 0.1 μg
Root mean square noise of ≤ 0.3 μg
True0™ RH
Only DVS instrument offering True0™ RH
Achieve partial pressures of water as low as 0.0% RH
Study of hydrates and other compounds only completely dry below 1% RH
Allows investigation of sorption/desorption at low RH levels
Key measuring capabilities:
Water, organic solvent, and gas sorption and desorption isotherms
Co-adsorption isotherms using two vapors
Optional in-situ sample preheating/drying to 200 °C
Multiple sorption/desorption and sample drying or activation cycles
Sample masses from 1 mg to 5000 mg
Surface and bulk measurement capabilities and analyses
Key hardware benefits:
Only system to measure organic vapor partial pressure directly using Ultrasonic Sensor (patent pending)
Open stainless steel stand design enabling easy access to sample pan while minimizing static electric charging
Broad range (5-85 °C) and single uniform and accurate temperature enclosure
Next generation control and evaluation software for the most advanced experimental design and data analysis
Capable of upgrading to 5 balances
Optional IR, Raman and Video imaging with integrated control software
Technical Specification
< click here
Temperature
Temperature controlled enclosure
Control range: 5 °C to 85 °C
Control precision: ±0.1°C
Enclosure also provides anti-condensation protection
High temperature pre-heater for sample drying/activation
Delivers local sample temperatures of up to 200 °C
Heating ramp rates: up to 10 °C / min
Sensor: Pt-100 thermocouple
Resolution Stand
Manifold: 316 stainless steel
Seals: Viton
Tubing: 1/4 inch stainless steel
Solvent Reservoirs
Material: Pyrex glass
0.25 and 0.5L as standard
2 Reservoirs included
Relative humidity generation and measurement
High accurate digital mass flow controllers and capacitance probe
Relative Humidity Sensors
Capacitance probe
Carrier Gas – Dry air or Nitrogen
Relative humidity range from 0 to 98%
RH range accuracy from 5 – 60 °C ±1%
RH range accuracy from 60 – 85 °C ±2%
Speed of Sound Sensor for organic vapors
Carrier Gas – Dry air or Nitrogen
Partial Pressure range from 0 to 90%
Partial Pressure accuracy from 10 – 70 °C ±1%
Solvents Available include:
Acetone
Chloroform
Cyclohexane
Decane
Dichloromethane
Dichloromethane
Ethanol
Ethayl acetate
Ethyl benzene
Heptane
Hexane
Isopropanol
Methanol
Nonane
Octane
Toluene
Water
M-Xylene
p-Xylene
System Software
Next generation purpose built control and evaluation software for the
most advanced experimental design and data analysis.
DVS Control
Complex protocols for multiple experimental sequences using sample pre-heating and conditioning; isotherm, isobar and ramped humidity and organic vapor methods; single or dual vapor delivery and control; fixed time or mass derivative steps.
Multiple-method protocols incorporating:
• Sample pre-heating
• Vapor sorption
• Vapor exchange
• Dual vapor co-adsorption
• Temperature changes in a single experiment, including
• Ramp or step changes in relative humidity
• Automated video image acquisition
• Organic vapor sorption partial pressure
• Temperature stages may be based on fixed-time or user defined dm/dt criteria
• Complex isotherm experiments
• Experiments may include half, full or multiple partial pressure or temperature cycles
Analysis
• Isotherms
• Permeability and diffusion
• Kinetics information
• Heat of sorption
• Tg determinations
• Amorphous content
• BET
21CFR Part 11 software solution is available for all DVS software upon request.
Mass measurement
UltraBalance™ low mass
Sample mass: between 1 and 1000mg
Mass change: ±150mg
Resolution (precision): 0.1 μg
Root mean square
balance noise: ≤ 0.3 μg
UltraBalance™ high mass
Sample mass: between 10 and 5000mg
Mass change: ±1000mg
Resolution (precision): 1 μg
Root mean square
balance noise: ≤ 3 μg
Downloads
Related Products
