E16521D.3 Single Channel Speed Monitor for magnetic pick-up sensors (MPU), Overspeed Protection System.



Single Channel Speed Monitor E16521D.3 for increased safety requirements up to SIL2

The BRAUN Single Channel Speed Monitor E16521D.3 for increased safety requirements is SIL2 / IEC 61508:2010 compliant. It monitors motors, pumps, feeders, gears, rollers, and small turbines. The device provides protection against overspeed at any required value of rotational speed, including standstill.
The specially designed signal input fits perfectly with Magnetic Pick-Up sensors (MPUs).

With single-channel processing (1oo1), safety provision is solely determined by the device configuration. Therefore the use of sensor monitoring with integrated plausibility control is essential. In such a case, no redundancy is provided. Should a fault be detected, the entire system will be shut down immediately.
With two-channel systems, there is a choice of implementation, dependent upon requirements. In principle, the two monitors operate in parallel yet independently. Alarm indication can be realized through the linkage of their Safety Outputs.

For 1oo2 processing, we have system redundancy with enhanced safety through comparative diagnosis. The fault detection of one monitor will shut down the system as a whole immediately. With 2oo2 processing, we still have system redundancy but with enhanced availability. Only the fault detection of both monitors will shut down the system as a whole.
The E16521D.3 Speed Monitor permanently monitors the speed sensor for its correct function. During its complete useful lifetime of 20 years, the Monitor does not require any external proof tests and is completely maintenance-free.

Key Features

  • SIL2 / IEC 61508:2010 compliant
  • Single Channel Monitor with sensor monitoring and self-test function
  • Frequency range 0 Hz…50 kHz
  • 1 Analog Output 0/4…20 mA
  • Bright red digital LED display
  • 1 Safety Output as DPST relay
  • 3 Alarm Outputs, one as SPST relay and two as PhotoMOS relays
  • Signal Input for Magnetic Pick-Up sensors (MPUs)
  • Square wave Pulse Output
  • USB 2.0 Data Interface
  • Two Monitors, suitably configured with their Safety Outputs linked together, may provide a protection system with 1oo2 or 2oo2 redundancy
  • Universal Power Supply range 20…265 Vuc


  • Fast, precise, and safe
  • Maintenance-free during the lifetime, therefore minimized TCO
  • Universal range of application, throughout mechanical and electrical engineering, in the chemical industry, in power plants, and at test stands
  • Increased safety with 1oo2 architecture
  • Maximum availability with 2oo2 architecture

Product Brochures

Title Language File type
E16521D.3 Product Brochure English PDF

Technical Manuals

Title Language File type
E16521D.3 Manual English PDF
E16521D.3 Manual PDF

Product Certificates & Declarations of Conformity

Document type Language Scope File type
EU Declaration of Conformity English European Union PDF
UK Declaration of Conformity English German United Kingdom PDF
SIL2 Manufacturer Declaration English Worldwide PDF
EAC Clearance Certificate Russian Eurasian Customs Union (EAC) PDF
EAC TR CU Certificate Eurasian Customs Union (EAC) PDF
Metrology Certificate E16 Eurasian Customs Union (EAC) PDF
Metrology Certificate E16+A5S Eurasian Customs Union (EAC) PDF