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About Theta High Pressure Chamber

The Attension Theta High Pressure Chamber is an add-on module for the Theta Flex Optical Tensiometer for measuring wettability and interfacial tension at high pressures and high temperatures with enhanced oil recovery research.  With the harsh conditions of an oil reservoir in mind, the instrument is designed to ensure ease of use and yet offer wide measurement possibilities.

The chamber includes a unique piston design which is especially useful in any studies including surfactants. Traditionally, the pressure is increased within a chamber by pumping more fluid into it. However, when surfactants are used in the measurement this will lead to a situation where surfactant concentration will also change while changing pressure.

In order to eliminate the issue, in the Attension High Pressure Chamber the pressure can also be increased by using a movable piston inside the chamber. The piston will compress the fluid in the chamber without the need to pump in more fluid. Therefore, both surfactant concentration and measurement pressure can be controlled independently.

The Attension High Pressure Chamber is operated with modern OneAttension software. OneAttension includes features such as

  • Automatic baseline detection and drop shape fitting
  • Live analysis of results
  • Ready-made experiment recipes for quick and repeatable operations
  • Flexible and programmable frame per second rate recorded by the camera

The chamber itself is CE-marked and made from high quality stainless steel. It is easily removable for cleaning purposes.

Features & Benefits

  • Interfacial tension and contact angle measurements in high pressures and temperatures. Automatic analysis by OneAttension software will provide the results easily and quickly.
  • Optimal for mimicking oil reservoir conditions. Interfacial tension and contact angle give an accurate and quantitative measure of the wettability in reservoirs.
  • Unique piston design enables to use surfactants also in high pressures with constant concentrations.


Theta Flex Optical Tensiometer with High Pressure Chamber
Theta Flex optical tensiometer with High Pressure Chamber module

Attension High Pressure Chamber can be used in a variety of applications. The applications and industries include:

  • Enhanced oil recovery (EOR), wettability conditions within oil reservoirs
  • Supercritical fluids (SCF), supercritical CO2
  • CO2 storages
  • Polymer industry

Application example

Wettability of CO2 in Enhanced Oil Recovery (EOR)

In order to gain the maximum yield from an oil reservoir, methods grouped under the name enhanced oil recovery (EOR) are used. One common EOR method is to use CO2 to both dissolve and displace oil in a reservoir.

To study the effectiveness of the CO2, the wettability of it can be measured by using interfacial tension and contact angle measurements. The interfacial tension between CO2 and brine, for example, correlates with how easily carbon dioxide can be pumped into the reservoir. Likewise, the contact angle of an oil drop in a carbon dioxide environment gives a measure how well the CO2 can displace the oil on rock surface.


Manual measurements of liquids
Automated measurements of liquids
Automated measurements of liquids and gases
Included high pressure pumps 2 manual pumps 2 automated HPLC pumps
  • 1 automated syringe pump for bulk phase
  • 1 automated HPLC pump for droplet phase
Temperature range ambient to 200C ambient to 200C 1 to 200C
Measurement types Surface tension, interfacial tension, contact angle, surface free energy
Maximum pressure 400 bar
Chamber volume 85 ml without piston, 40-62 ml with piston
Pressure control options
  • Pressure increase by integrated piston
  • Pressure increase by adding more liquid/gas with pump
Sample introduction and fl shing Through integrated 6-port valve
Max solid sample size 20 mm x 20 mm x 8 mm (xyz)
Maximum camera resolution 1984 x 1264 px
Maximum measuring speed 3009 fps
All-inclusive software OneAttension
Dimensions 74 cm x 25 cm x 61 cm (L x W x H) for Theta and chamber
Weight 16 kg (Theta and chamber)
Power supply 100 – 240 V AC
Frequency 50 – 60 Hz
Recommended system requirements 2 GHz processor, 2 GB RAM, 120 GB hard disk drive1, 1024×768 resolution, 1 USB2 or USB3 port, 1 USB3 port, 1 additional USB2 or USB3 port if Peltier used, Windows7/8/10 (32 or 64 bit)
1 SSD hard disk (min. 500 MB/s) needed for high speed recording with high resolution

All Downloads

Filename Size Download
Attension Theta High Pressure Brochure 0.41MB Download
Theta High Pressure Chamber Application Note 0.30MB Download
Attension High Pressure Chamber Product Sheet 0.78MB Download

Ordering Information

Part Number Description
HPC1 High pressure chamber for manual measurement of liquids using Theta Flex optical tensiometer
HPC1-Auto High pressure chamber for automated measurement of liquids using Theta Flex optical tensiometer
HPC2-Auto High pressure chamber for automated measurement of liquids and gases using Theta Flex optical tensiometer
  • Last updated: June 2024
  • Version: 1.0

Statements, technical information and recommendations contained herein are based on tests we believe to be reliable but they are not to be construed in any manner as warrantees expressed or implied. The user shall determine the suitability of the product for his intended use and the user assumes all risk and liability whatsoever in connection therewith.