Dynamic Vapor Sorption - Automated Systems | METTLER TOLEDO
Dynamic Vapor Sorption (DVS)

Dynamic Vapor Sorption (DVS)

Gravimetric determination of the water sorption and desorption behavior by DVS

 

Dynamic Vapor Sorption (DVS)

The Technique

Dynamic Vapor Sorption, or DVS, is a gravimetric technique that measures the...

The Technique

Dynamic Vapor Sorption, or DVS, is a gravimetric technique that measures the mass of a sample as it changes in response to programmed changes in temperature or humidity. A typical experiment exposes a sample to an environment where the temperature is held constant and the humidity is varied in a stepwise fashion.

The sample mass must be allowed to reach gravimetric equilibrium before proceeding to the next humidity step. The mass change at each step is recorded which allows the moisture sorption isotherm to be generated. These experiments are often very long as the sample equilibration times are slow. This makes traditional approaches expensive and time consuming. The ProUmid DVS systems solve this problem by studying up to 23 samples simultaneously.

In a DVS study, the sorption isotherm consists of two components: sorption and desorption. Sorption occurs during increasing humidity steps where the material takes up moisture while desorption occurs during decreasing humidity steps where moisture is lost. Sorption can be further investigated by separating absorption (moisture on the surface) from adsorption (moisture that penetrates into the bulk).

The difference between moisture sorption and desorption is called hysteresis and can prove useful when characterizing a material's interaction with moisture and its porosity. In addition, the ProUmid SPS DVS allows the use of in situ photography and Raman spectroscopy to characterize the physical changes associated with the gain or loss of moisture.

 

Applications

While the sorption isotherm determination is the most common application for DVS instruments, other applications include:

  • Investigation of moisture induced changes to the glass transition
  • Amorphous to crystalline conversions
  • Gain and loss of hydrates
  • Sample deliquescence

Films can be studied for permittivity per EN ISO 7783-1 part 1: 'Dish method for free films' and allows the accurate determination of the water vapor permeability of foils and films.

The ProUmid Software allows the weight changes in response to humidity and temperature to be monitored in real time. After the experiment is complete, detailed analysis of the data is simple to complete and can be exported to other programs for further analysis. The 21CFR Part 11 software package ensure that the ProUmid Test system is fully compliant and traceable.

 

Industries

Dynamic Vapor Sorption experiments prove to be useful in numerous industries. The food industry is interested in both the effect of moisture on food products as well as the permeability of packaging. Pharmaceutical companies are concerned with how humidity can change structure and polymorphic nature of materials, affect degradation and storage life, and affect handling.

Construction suppliers need to know how humidity affects building and insulation materials. The effects of humidity on materials are wide spread - any material that can be affected by humidity can be studied in the ProUmid DVS.

 


 

Products and Specs

 
Products and Specs
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Weight Range
Temperature Range
Number of samples
Humidity Range
Application Fields
SPS23-100n
SPS23-100n
Weight Range 3 mg – 2000 mg
Temperature Range 5 °C – 40 °C
Number of samples 23
Humidity Range 0% RH - 98% RH*
Application Fields Pharmaceutical research and preformulation
Weight Range3 mg – 2000 mg
Temperature Range5 °C – 40 °C
Number of samples23
Humidity Range0% RH - 98% RH*
Application FieldsPharmaceutical research and preformulation
Permeability Kit OptionNo
Video Camera OptionYes
Raman Spectroscopy OptionYes
SPSx-1u Advance
SPSx-1u Advance
Weight Range 10 mg – 22 g
Temperature Range 5 °C – 40 °C
Number of samples 23 / 11
Humidity Range 0% RH - 98% RH*
Application Fields Pharmaceutical, Food, Chemistry, Material Testing
Weight Range10 mg – 22 g
Temperature Range5 °C – 40 °C
Number of samples23 / 11
Humidity Range0% RH - 98% RH*
Application FieldsPharmaceutical, Food, Chemistry, Material Testing
Permeability Kit OptionNo
Video Camera OptionYes
Raman Spectroscopy OptionYes
SPSx-1u High Load
SPSx-1u High Load
Weight Range 30 mg – 220 g
Temperature Range 5 °C – 60 °C
Number of samples 23 / 11
Humidity Range 0% RH - 98% RH*
Application Fields Food, Chemical, including permeability tests
Weight Range30 mg – 220 g
Temperature Range5 °C – 60 °C
Number of samples23 / 11
Humidity Range0% RH - 98% RH*
Application FieldsFood, Chemical, including permeability tests
Permeability Kit OptionYes
Video Camera OptionYes
Raman Spectroscopy OptionYes
SPS11-10u
SPS11-10u
Weight Range 50 mg – 220 g
Temperature Range 5 °C – 60 °C
Number of samples 11
Humidity Range 0% RH - 98% RH*
Application Fields Building physics, QA, permeability tests
Weight Range50 mg – 220 g
Temperature Range5 °C – 60 °C
Number of samples11
Humidity Range0% RH - 98% RH*
Application FieldsBuilding physics, QA, permeability tests
Permeability Kit OptionYes
Video Camera OptionYes
Raman Spectroscopy OptionYes
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