Istec SpeedSys T20

The SpeedSys T20 is a dual-channel speed monitor and switch that delivers speed monitoring and protection functions to rotating equipment. It converts the signals from speed sensors to processed outputs. Its small technical footprint allows for a low-impact installation, to enable speed monitoring to a wide range of applications. The T20 is part of the SpeedSys tachometer series with the T10 and T30. 

SpeedSys T10 for 1-channel speed monitoring and switching »
SpeedSys T30 for 3-channel speed monitoring and switching » 

Any speed function

The SpeedSys T20 provides overspeed, underspeed and acceleration protection, and has extensive monitoring functions, including dynamic sensor monitoring (comparing channels), reverse rotation, creep and standstill.

Standalone protection & monitoring

The system has redundant inputs for direct sensor connections and digital input signals, a redundant power supply, multi-channel integrated switching, and Modbus TCP & RTU communication.

Small technical and financial impact

The SpeedSys T20 is a DIN-rail module that provides a cost-effective solution for speed monitoring functions on rotating machinery.


The SpeedSys T20 has four relays. The system accepts signal inputs from 3-wire voltage sensors (Hall-effect & proximity), 2-wire voltage sensors (MPU), and digital input signals from speed encoders.

Due to its compact design the T20 has a small technical footprint and features a low-impact installation. The T20 comes with easy to use push-in connectors and is mounted on a DIN-rail.   



The SpeedSys T20 is used as a 2-channel monitoring and switching device for speed conditions on rotating machinery. Typical applications are: 

  • Aeroderivatives
  • Micro turbines
  • Wind turbines
  • Gas- and steam turbines
  • Hydro turbines (Kaplan, Francis, Pelton)
  • Compressors
  • Expanders
  • Marine applications
  • Elevators
  • General automation



Redundant input channels

The SpeedSys T20 features redundant input channels, making it suitable for speed protection and monitoring.

Multiple input signals

The system can process input signals from 3-wire voltage sensors (Hall-effect & proximity), 2-wire voltage sensors (MPU), and digital input signals from speed encoders.

Industry standard outputs

The SpeedSys T20 connects every common speed function to any industry standard output.


System features

  • 2 independent channels
  • Redundant sensor inputs
  • Redundant power supply
  • 4 high speed relays
    • 2x DPST
    • 2x SPST


  • Fast 8 ms hardware response time (relays)
  • Highly accurate analog signal (4-20 mA)
  • Signal filter and line amplifier