Dold Industries Ltd

11 Hamberts Rd. Blackall Ind. Estate
South Woodham Ferrers
GB-Essex, CM3 5UW
SK 9055

Speed Monitor

SK 9055


Auxiliary voltage

Setting range

Start up delay


Approvals and Markings


  • 0060729
  • SK9055.11/004/60 50-50000IPM DC24V
The speed monitors IK 9055, IL 9055, SK 9055 and SL 9055 monitors the rotational speed of... more

Product description

The speed monitors IK 9055, IL 9055, SK 9055 and SL 9055 monitors the rotational speed of motors. They recognise and monitor impulse signals of e. g. proximity sensors and protect machines and produced material or allows speed depending switching in production processes.

Technical specifications

Width: 17,5 mm
Measuring range max.: 600000 IPM
Auxiliary voltage: DC
Classification: Drehzahlüberwachung
Operate delay: Yes
Output contacts: 1 C/O contact
Enclosure design: Switch cabinet
Type: SK 9055


  • Protection of persons, machines and products
  • Easy setting
  • Universal input, for configuration of different sensors (PNP, NPN, 2-wire, contact, voltage)


  • According to IEC/EN 60255-1
  • Detection of over- or underspeed or frequency, function selectable
  • 3 selectable ranges for frequency or speed, adjustable tripping value
  • Ranges up to 10 kHz ( 600.000 ipm) available,therefore suitable for turbines, centrifuges and similar applications
  • Adjustable hysteresis
  • Input also suitable for SKF sensor bearings
  • As option for Namur sensors
  • As option for permanent magnet sensors
  • As option with adjustable switching delay/start up delay
  • On request with manual reset
  • IK 9055 and SK 9055: compact version for DC 24 V auxiliary supply
  • IL 9055 and SL 9055: for auxiliary supply up to AC 400 V with galvanic separation to sensor input
  • De-energized on trip (Energized on trip on request)
  • LED indicators for auxiliary supply, sensor pulses and contact position
  • 1 changeover contact (2 changeover on request)
  • Devices available in 2 enclosure versions:
    IK/IL 9055: depth 59 mm, with terminals at the bottom for installation systems and industrial distribution systems according to DIN 43 880
    SK/SL 9055: depth 98 mm, with terminals at the top for cabinets with mounting plate and cable duct
  • DIN rail or screw mounting
  • IK 9055, SK 9055: width 17.5 mm
    IL 9055, SL 9055: width 35 mm