What you can measure

  • Static contact angle 
    Sessile drop and captive bubble
  • Dynamic contact angle 
    Dynamic contact angle, advancing and receding contact angle and contact angle hysteresis
  • Surface free energy 
    Sessile drop and captive bubble
  • Surface- and interfacial tension 
    Pendant drop and reverse pendant drop methods

A quick view

This 2-minute video provides you with the basics of measuring under high pressures and high temperatures with Theta High Pressure. Watch it in fullscreen for the best experience! 

3 reasons to invest

Optimal for surfactants and brine

With the integrated piston you can increase the pressure without adding more fluid. This allows you to to keep the surfactant concentration constant and corrosive fluids are restricted to the chamber only.  

Easy to use

Theta High Pressure has plenty of smart solutions simplifying your work. The sample port enables direct introduction of your sample with a syringe and direct cleaning of the same sample line without passing through a pump. With our optional automatic pump the pressure can be changed with just one click. 

Intuitive software

Highly intuitive with high functionality. The OneAttension software facilitates your experiments and provide instant results. The software features live analysis and automatic measurements.  


Mimic the real world

There are plenty of applications where conditions are harsh. Take enhanced oil recovery for example. Theta High Pressure is designed with the conditions of an oil reservoir in mind. In short, the closer you are to the real world when conducting your experiment, the better the result. 

The wettability of rock and interfacial tension are both vital parameters in enhanced oil recovery, since they directly affect oil displacement and mobility. These properties are dependent on both pressure and temperature. It is therefore important to measure them under conditions reflecting the oil reservoir. It is the very first step when you want to optimize your processes to increase the oil yield. 

InstruMentor logo

Not sure which tensiometer you need?

Our tensiometer selector guides you to your optimal instrument.

Try InstruMentor


A closer look at the specifics

Theta High Pressure is based on our versatile Theta Flex. Check out the specifications compared to Theta Lite. Theta High Pressure comes in different variations. Are you measuring liquids, gases or both? What level of automation do you want?  

Theta Flex
Theta Lite

Available Measurements

Static contact angle
Dynamic contact angle
Automatic Manual
Surface/Interfacial tension
3D surface roughness
Interfacial rheology
Surface free energy
Zisman Plot, OWRK/Extended Fowkes, van Oss Acid-Base, Wu, Neumann’s Equation of State, Schultz 1 and 2

Available Measurement Methods

Sessile drop
Batch sessile drop
Captive bubble
Pendant drop
Reverse pendant drop
Dynamic contact angle
Automatic Manual
Pulsating drop
3D Topography


Measuring range (°, mN/m)
0…180, 0.01…2000 0…180, 0.01…2000
Accuracy (°, mN/m)
±0.1, ±0.01 ±0.1, ±0.01
Maximum sample size (mm)
Unlimited×100×320 (with stage) Unlimited×45×200 (with stage)
Integrated sample holders
Yes Yes
Frame interval
0.33 ms ... 1000 s 0.48 ms ... 1000 s
Maximum resolution (px)
1984×1264 1280×1024
Maximum measuring speed (fps)
3009 2068
USB 3.0 digital camera with zoom USB 3.0 digital camera
Camera protection
Inside instrument covers Inside instrument covers
Camera view angle (°)
 -4.5 ... 2.5  -2 ... 2
Light source and size
LED based background lighting, 62 x 62 mm LED based background lighting, Ø 20 mm
Field of view (Ø, mm)
1.44…32.3 2.9…12 
Measurement indicator LED
Yes No
Disposable tip dispensing
Dimensions — Basic frame (L×W×H, mm)
 765 x 230 x 435  495 x 130 x 310
Weight — Basic frame (kg)
26 5
Power supply (VAC)
90…264 100…240
Frequency (Hz)
47 ... 440 50 ... 60


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
1 automated HPLC pump

Temperature range

ambient...200C ambient...200C 1...200C

Measurement types

Surface tension, interfacial tension, contact angle, surface free energy  

Maximum pressure

400 bar  

Chamber volume

85ml (without piston), 40-62ml (with piston)  

Pressure control options

Pressure increase by piston or by adding more liquid/gas with pump  

Sample introduction and flushing

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



74 cm x 25 cm x 61 cm (L x W x H) for Theta and chamber  


35 kg (Theta Flex and chamber)  

Power supply

100 - 240 V AC  


50 - 60 Hz  

Recommended system requirements

2 GHz processor, 2 GB RAM, 120 GB hard disk drive1, 1024x768 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)  


OneAttension Software

We made our software for Theta High Pressure with you in mind. It is a fine combination of a very intuitive interface and high functionality. Follow your experiment live, and get the results within seconds. OneAttension is analyzing made easy. Let's have a look at the features! 





OneAttension Features

  • User friendly interface
    To get you going in no time
  • Automatic baseline detection and drop shape fitting
    Less user dependency
  • Pressure stored in software
    Revisit your results and the experimental conditions
  • Full temperature control
    Automatic control between 1... 200 degrees C with optional heating
  • Live analysis
    Instant results ready during the measurements
  • Volume from image
    Droplet volume is detected from the drop shape


Accessories and Modules

Added extras give you more possibilities and opportunities in your research. Have a look at what you can complement Theta High Pressure with. You can find the full range of accessories below. 


Resistor temperature control for HPC

Resistor temperature control for T317. Temperature range: ambient…200 °C.


Peltier temperature control for HPC

Peltier temperature control for T317. Temperature range: 1…70 °C. Includes Peltier element and T102USB (Julabo).


Automatic liquid pump for HPC

Automatic Shimadzu liquid pump for pressurizing the chamber or creating a droplet of liquid.


Automatic liquid and gas pump for HPC

Automatic ISCO pump for pressurizing the chamber with liquids or gasses.


What others say

Our instruments are present at many prestigious universities and research facilities worldwide. Take a minute to find out what others say about Theta High Pressure. 



Dr Nassar Group for Nanotechnology Research, Department of Chemical and Petroleum Engineering, University of Calgary

"We are studying the role of naturally-derived nanoparticles in oil and gas application. We use nanoparticles to study foam stability, IFT reduction and wettability studies as well as dilatational interfacial rheological studies."


University of Calgary, Canada

"We are utilizing the Attension Theta High Pressure mostly for the IFT and wettability measurements and the PD200 system for the dilatational interfacial rheological measurements. We are satisfied with the performance of all the instruments from Biolin Scientific. The instruments are user friendly and easy to maintain. We are also contented with the after-sales service."

Read more in this Case study


Jin Haichuan, Beihang University

"We are satisfied with the performance the system and it's also easy to clean the chamber and maintain the system. We are also very satisfied with the after-sales service."


Beihang University, China

Beihang University is a major public research university located in Beijing, China. The university emphasizes in engineering, technology, and the hard sciences. Beihang University is using the Theta High Pressure system in their research. 


Learn more

We have gathered all our in-depth knowledge associated with Theta High Pressure. Browse around amongst webinars, case studies and white papers to find a topic of your interest. 

  • Attension

The Importance of Contact Angle in Industry

Get examples of how contact angle measurements are utilized in different industries.

Get it
  • Attension

Enhanced Oil Recovery - Measuring Minimum Miscibility Pressure

Hear Professor Sandro da Rocha on how to determine the pressure at which CO2 is miscible with oil.

Go there
  • Attension

Wettability Alteration in Carbonate Reservoir

You get an introduction to wettability in a carbonate reservoirs and a view of the most used enhanced oil recovery methods.

Get it
  • Attension
Case Study

Enhanced Oil Recovery using Nanoparticles

We show you how nanoparticles can be utilized to enhance oil recovery and how contact angle measurements can be used.

Get it
  • Attension

How do Pressure and Temperature Affect on Wettability?

In enhanced oil recovery it is important to find out how pressure and temperature affect wettability. We show you how.

Get it
  • Attension
White Paper

Wettability Measurements for Enhanced Oil Recovery Optimization

You get an overview of the most relevant wettability measurement methods for enhanced oil recovery optimization.

  • Attension

Effect of Temperature and Pressure on Wettability of Solids

Listen to Professor Zhenghe Xu sharing his knowledge on bitumen recovery.

Go there
  • Attension

CO2-in-water Foam

Hear Professor Sandro da Rocha on CO2-in-water foams and how to design surfactants for these systems.

Go there
  • Attension
White Paper

Contact Angle - What is it and how do you measure it?

Learn more about one of the most used measurement method to study the wettability of the surface.

  • Attension
White Paper

Surface and Interfacial Tension

Study the different measurement methods to select the best choice for your application.

  • Attension

Surface Tension and Surfactants in Industrial Processes

Get an overview of how surfactants are used in industrial processes.

Go there
  • Attension

Using Contact Angle Measurements in Surface Research and Quality Control

Get an understanding about how contact angle measurements are utilized in industry to optimize and control surfaces.

Go there
  • Attension

Working with QCM-D and Contact angle measurements under high pressure - Oil and gas applications

Explore the possibilities of performing measurements in high pressure, techniques especially suitable for oil and gas applications.

Go there