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Torque monitoring and control

The Safe-Guard-Solution monitors the torque of agitators.

Individual solution

Together with the client, TELE developed an automatic torque monitoring and control system for agitators in biogas plants.

At a glance

The German company Streisal GmbH is an international full-service provider of agitators and mixing systems for wastewater treatment, biogas plants, and industrial process engineering. The company was looking for an automatic torque monitoring and control system for its energy-saving Biobull fermenter/agitator. Streisal, together with TELE, developed a solution that reliably detects the analog signals of the frequency converter and thus effectively controls torque peaks. In this way, overloading and damage to the agitator is avoided, prolonging its lifespan.

TELE-Streisal-Biobull- quer


Within a biogas system, the fermenter/agitator ensures the uniform mixing of large amounts of liquid. For economical operation of the agitator, it is important that the torque does not rise excessively due to things such as high viscosity of the liquid. Otherwise, there is a threat of higher wear and damage to the system. Therefore, TELE and Streisal have developed the Safe Guard torque monitoring and control system. First, the system receives a target value from the PLC for the engine speed, and secondly it taps the analog signal of the torque of the frequency converter of the system. If the torque surpasses a defined setpoint, Safe Guard limits the speed. The system can additionally be operated without a PLC using an external setpoint device.


Safe Guard is operated via a touch panel with a user administration interface, where user and admin rights can be assigned. All events are stored via a data log and can be used at a later point for analysis. If no impermissible torque peaks are detected, the indicator light defaults to green. If a torque peak over the permitted threshold is detected, the display starts flashing green. The reduction of the speed occurs in five stages, with a customer-defined delay time to the also predetermined minimum safe frequency. After a delay time, the speed is automatically adjusted up one level. If the torque peak occurs again, it is again reduced. In this way, the system always performs in the optimum speed range.

Added value

  • Reliable partnership
  • TELE coordinates all required suppliers
  • Development and production in Vienna
  • Meets industry-specific requirements
  • Short development time
  • Possibility of individual scaling
Portrait Johannes Schenner
"We have long-standing partnerships with our customers. This made it possible to bring the project to market-readiness within just six months, based on existing developments."
Johannes Schenner Project manager at TELE

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