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Dual channel tachometer (T-501)

The Jaquet T501 is a dual channel tachometer speed switch for complex measurement, control and protection applications. It has 2 frequency and 2 binary inputs and features 2 current, 4 relay and 2 open collector outputs. The system offers programmable logical, diagnostic and measurement functions and extensive parameter and limit setting possibilities. With the 4 parameter sets, each with 6 system limits, the system is suitable for almost limitless applications. The T501 can be configured via the included Windows® software using the ethernet interface.


  • Highly accurate speed measurement
  • Fast 8 ms reaction time on overspeed
  • Sensor monitoring for all sensor technologies
  • Compatible with all popular sensor types
  • 2 frequency inputs, 0.025 Hz – 50 kHz
  • 2 binary inputs for parameter selection, commands or relay control
  • 4 parameter sets, each with 6 system limits
  • 2 analog outputs, 4 changeover relays, 2 open collector outputs
  • Ethernet connection and Windows® software for configuration
  • VDC powered / VAC powered

Typical applications

  • Micro turbine overspeed protection and speed measurement
  • Engine start control and protection
  • Dual turbocharger speed measurement
  • Critical safety applications
  • Universal speed indication

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