Hiller Separation & Process

Remote condition monitoring of mission-critical decanter centrifuges




Turnkey Solutions, Industrial Insight



Reading time

6 minutes

Hiller GmbH and A1 Digital develop a solution that will enable Hiller to monitor its decanter centrifuges and complete systems for solid-liquid separation remotely and even control them in the future. This paves the way to remotely maintain and diagnose machines, optimize processes, and predict maintenance intervals.

Hiller Gmb H Luftbild 2021

For over 50 years, Hiller has been developing and manufacturing decanter centrifuges and solid-liquid separation solutions systems for various facilities. Their solutions are elementary parts for applications in environmental and sewage use cases, food and luxury goods, or extraction and separation of mineral oil, gas, and renewable energy.

Application-critical decanter centrifuges and complete systems for solid-liquid separation

Machines such as the Hiller Decanter DP574 shown below are indispensable in the oil industry to separate 3-phase oil (oil contaminated with dirt and mixed with water), i.e. for the efficient separation of solids and the simultaneous separation of two liquid phases (oil, water). Such machines have many moving, interacting, and adjustable components. Several parameters must be monitored for a successful separation process, such as, among others: Electricity, drive frequency, drive vibration, voltage or torque.

Hiller DP574 FD

To generate the highest possible yield, different process parameters such as speeds, torques, or flow rates need to be adjusted depending on the industry, product, and material.

Hiller supplies not only the decanter but complete solid-liquid separation systems to its customers, if needed. This includes, among other things, the screw conveyor, the polymer and feed pump, hoses, or the electronics such as the Hiller SEE-Control pro control unit. For more information on the product portfolio, please visit Hiller's website.

Illustration: Hiller DecaPress® two-phase centrifugal dewatering system with FSG-Drive

Hiller Deca Press Schema DE

In order to expand and improve the service for the customers, the expansion of remote machine monitoring was the next logical step. For this, we chose A1 Digital as a partner to develop a strategy. In doing so, it was important to develop a system that could also be used to retrofit old equipment.

Christian Schneider Drive & Control Technology, Hiller GmbH

A new level of machine monitoring

The data from the Hiller decanters is read out with a PLC. A connected gateway sends it to A1 Digital's cloud platform with the help of A1 Digital's connectivity.

Importantly, solution architects at A1 Digital have developed a special agent for the gateway that can communicate with the PLC. This agent collects data from the machine at very short intervals, translates it from the PLC standard into a readable format, and transfers it to the A1 Digital Industrial Insight IoT platform in real-time. A1 Digital has already developed similar protocols and agents for various other industries.

Hiller's machines are critical to the company, with safety being a top priority. Therefore, cybersecurity was incorporated into the system design from the beginning.

1. Data acquisition and transmission

A special agent running on the gateway sends data in real time to the A1 Digital IoT platform.

Gateway sending data

2. Processing in the IoT platform

The IoT platform can visualize the data for remote monitoring, set thresholds, provide insights using advanced analytics tools and machine learning, and create business automations.

Io T Platform on Exoscale EU Cloud

3. Process optimization

The data collected enables processes to be better understood and optimized. With the help of the machine experts help and machine learning technology, the machines' maintenance status can be identified and shared with the customers and maintenance crew.

Customized solutions leo

The machine data is securely stored on Exoscale, A1 Digital’s GDPR-compliant European cloud. This enables Hiller and its customers to perform analyses, develop algorithms, export data and create process and business automation.

Just the beginning...

The more information is collected about the processes and machines, the greater leverage to optimize processes further and improve machine maintenance.

Hiller Bidirectional Io T Communication

Starting point for bilateral data communication

In the future, the system will make it possible to communicate bilaterally with the control unit on the centrifuges. This will make it possible to automate processes, change process parameters remotely and analyze the effects on the data in real-time. Technical experts could view the processes and run diagnostics in case of problems.

Predictive maintenance leo

Improving maintenance with Machine Learning

Based on the data, engineers can deduce how the mechanical properties of the machine behave over time and deduct when the machine needs maintenance or cleaning. In the future, data will be automatically analyzed in real-time. Automating monitoring tasks of all machines makes it possible to prevent unplanned machine failures. Machine learning is the perfect assistant for monitoring the immense amount of data that Hiller's machines create. A human being could only do this to a limited extent, as the amount of data would overwhelm them. The automated monitoring of machines with the help of predictive maintenance could be another service Hiller GmbH offers its customers in the future.


With the remote machine monitoring developed by Hiller and A1 Digital, the user experience for Hiller’s customers has been significantly improved. It’s the first step and enables engineers and data scientists to improve processes for the applications in which Hiller's customers use its equipment.

To further enhance the user experience of the machines, improve maintenance services and prevent breakdowns, new algorithms are being developed to monitor data and predict maintenance cycles based on input and output data.

In the future, bi-directional communication between the plant and the IoT platform could allow diagnostics to be carried out remotely to provide better service and save travel costs.

Authors: Keyanoush Razavidinani, Christian Schneider, Elvin Sebastian

Io T Use Case Live Podcast AAA 2023

IoT Use Case Podcast

If you find this topic interesting, we have a tip for you: Learn more about IoT application examples in the industrial environment in this podcast episode. It was recorded live at the All About Automation 2023 in Friedrichshafen.

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