Technology - Electrical Tomography

How do Rocsole’s systems see inside the process pipelines and tanks?

Rocsole’s process imaging solutions are based on Industrial Process Tomography, more precisely Electrical Tomography (ET). Tomographic methods are typically used for imaging internal structures of targets that require non-invasive or non-destructive measurement techniques. The general idea in tomographic measurements is to expose the target of interest to a physical stimulus, e.g. electromagnetic waves, radiation beam, acoustic waves or electrical signals, and measure the response caused by the target. From the response signals it is possible, with the aid of mathematical models, to infer the distribution of different material within the target. An important feature of tomographic imaging techniques is that measurements can be conducted form outside the actual target without damaging or disturbing it.

What is Industrial Process Tomography?

Industrial Process Tomography is a general term for techniques intended for cross sectional or 3D imaging of material properties and distributions in various industrial positions such as in pipes, vessels and reactors. Process tomography covers several tomographic techniques, e.g. electrical, X-ray and ultrasound methods, and typical applications include e.g. monitoring of different mixing and sedimentation processes as well as determination of material concentrations and distributions in multiphase flows. An important feature of tomographic techniques is that the measurements are typically carried out from the periphery of the target using a specially designed sensor so that the measurements do not disturb the process. Tomographic measurements enable non-invasive process monitoring, which can give comprehensive understanding on the behavior of the process system and provide valuable information for process optimization and control.

What is Electrical Tomography (ET)?

In electrical tomography techniques, such as Electrical Resistivity Tomography (ERT), Electrical Capacitance Tomography (ECT) and Electrical Impedance Tomography (EIT), known voltage or current is applied to the periphery of the target via an appropriate electrode configuration. This will induce an electrical potential distribution in the target, and the shape of the potential distribution depends on the distribution of materials within the target. The effects of material distribution can be measured with the electrodes attached on the periphery of the target domain. With suitable mathematical models and data processing algorithms it is possible to determine images of material distributions in the region of interest. In process industry, this information may be very useful e.g. for optimal process control. Main advantages of electrical tomographic techniques are good time resolution, affordable price and negligible health and safety issues. Check ET Technology page for more information about utilizing ET technology in industrial environments.

Where is the tomographic technology developed?

Several research organizations have contributed to the development of different sectors of ECT, including the University of Eastern Finland in Rocsole’s hometown Kuopio. Important pioneering work in ECT was carried out at the US Department of Energy, Morgantown Energy Technology Center (METC) and at the University of Manchester Institute of Science and Technology (UMIST), and in UST for example at the Purdue University, USA.

Rocsole's Tomographic Systems

What types of sensors Rocsole offers?

Pipe sensor for imaging and monitoring of pipelines and profilers for imaging and monitoring of tanks. Check Sensor Types page for more information.

Do the sensors come in various sizes?

Certainly. Rocsole's sensors are tailored to fit the process.

Other sizes for both sensor types are available on request.

What materials are available for Rocsole's sensors?

Stainless steel (1.4404/316L), carbon steel, and super duplex. Other materials may be available on request.

How heavy are Rocsole’s sensors?

The weight depends on the sensor size and material. A standard 2"/DN50 stainless steel pipe sensor weighs approx. 33 lbs (15 kg).

What components do Rocsole's systems consist of?

Rocsole's systems consists of the following components:

  • Sensor, pipe or plug or probe
  • Electronics Unit, which contains the electronics
  • Computer Unit for computing and data transfer
  • Connection Unit for remote connection

Visit Sensor Types page for images and more information about the system components.

Which certifications are available for Rocsole's systems?

Rocsole's systems are available with ATEX/IECEx certification (ATEX ZONE 0 INTRINSIC SAFETY IA IIC T4 IECEx). All systems meet the requirements of the applicable EC directives. Check Sensor Types page for information on Rocsole's sensor design standards and principles.

How much maintenance do Rocsole's systems require?

Rocsole's systems are developed to handle tough process conditions and contain no moving parts, so a regular service or maintenance program is not needed.

What type of communication interfaces are available for Rocsole's systems?

Standard interfaces are 4..20 mA and Modbus/TCP. Other communication interfaces are available on request.

How much power do Rocsole's systems use?

Sensor and control unit 15W, data cabinet 20W, connection unit 15W.

Process Conditions

What is the maximum pressure for Rocsole's systems?

As our sensors are tailored to your process, our sensors can withstand very high pressures. We've delivered sensors that are rated for about 340 bar / 5000 psi.

Maximum pressure might vary according to the pipe size or probe length and the material of the sensor body.

What are the minimum and the maximum temperatures for Rocsole's systems?

Like with pressure, we can tailor the system to withstand high temperatures as well. Typically our sensors are designed for temperatures up to 170 °C / 340 °F, but we have manufactured sensors for processes that run at around 300 °C / 570 °F.

Ambient (environment) temperature range for the pipe and profiler sensors is typically: -4 - +140 °F (-20 - +60 °C). In over 104 °F (40 °C) temperature the Electronics Unit may demand additional cooling.

Buying and delivery

How can I buy Rocsole’s systems?

Contact Rocsole's sales for more information. We are happy to help.

What is the delivery time for Rocsole’s systems?

Delivery time for a standard 2"/DN50 pipe sensor is 6-8 weeks, EXW Kuopio.


Does Rocsole offer helpdesk and maintenance services?

Yes, we offer on-site and and remote support services based on a customer specific contract. Read more about the support services.

We are here to help you, don't hesitate to contact us!

Pekka Kaunisto

Pekka Kaunisto

Vice President Sales +358 40 024 0707
Harri Hedman

Harri Hedman

Chief Marketing Officer +358 40 166 3871
James Walls

James Walls

Regional Sales Director +31 61 466 9435
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