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  • InteliSENS™ SL-MID Series

Speed & Length Measurement

InteliSENS™ SL-MID Series

InteliSENS™ SL-MID Series - front view
InteliSENS™ SL-MID Series - rear view
InteliSENS™ SL-MID Series - connector panel view
InteliSENS™ SL Series - with AiG2 interface display unit


  • Non-contact, high-speed, solid-state laser speed and length measurement with no slippage, drift or mechanical wear and greatly reduced maintenance compared with contact wheel / roller systems.
  • Unidirectional speed and length measurement.
  • EU MID Class 1 accuracy compliant (0.125%).
  • EU MID-certified (certificate number: UK/0126/0089) for final shipping length measurement for products destined for EU-markets (EU Directive 2004/22/EC).
  • EU MID compliant 90-day data logging capability.
  • Fitted with PROFIBUS industrial communications bus as standard.
  • AiG2-MID interface display unit included as standard.
  • Optional EU MID-certified forward / reverse roller for direction sensing on bidirectional production lines.
  • Optional external printer available for batch length ticket printing.


Proton Products InteliSENSTM SL-MID Series non-contact, unidirectional speed and length gauges provide extremely accurate speed and length measurements in almost any production environment and are MID-certified (certificate number: UK/0126/0089 ) for final shipping length measurement for products destined for EU-markets (EU Directive 2004/22/EC).

Production processes for wire, cable, web products, woven and non-woven materials, paper, plastic film, tapes, building materials, floorings and labelling can all be measured using the laser Doppler method.

Applications requiring a precise cut-to-length process benefit from the non-slip and highly accurate laser measurement technique which reduces scrap, increases uptime and improves material yield by eliminating product “Give Away” or “Short Length” claims.

InteliSENSTM SL-MID Series gauges are money-saving, direct replacements for traditional problematic and high-maintenance contact wheel and roller-type devices and are extremely easy to install and operate. Integration with production line controllers such as PLCs is eased by the availability of a wide variety of industry standard communications interfaces.

The InteliSENSTM SL-MID Series is fully certified to Class 1 accuracy (0.125%) for final shipping length measurement for products destined for EU-markets (EU Directive 2004/22/EC).

Operating principle

Proton Products InteliSENSTM SL-MID series speed and length gauges illuminate the measured surface with an interference pattern created by the intersection of two laser beams. The alternating bright and dark interference fringes modulate the light scattered by the object with a frequency proportional to the object speed. This scattered light is detected by a photodiode and the electrical signal digitally processed to determine the frequency and hence the speed. Object length is then calculated by integrating the speed measurement over time.


Stand-off distance300mm
Minimum speed0.2m/min
Maximum speed5000m/min
Minimum single length measurement10m
Scale interval1mm
Accuracy class1-

Common Specifications

Measurement interval40µs
Laser spot size3mm
Operating temperature545°C
Environmental protectionIP67-
Power supply152425VDC
Power consumption20W
Measurement unitsSpeedmetres / minute
Laser safety control inputsLaserAn external closed SPST contact enables the laser diode.
ShutterAn external closed SPST contact opens the laser shutter.
2×Logic inputsElectricalMaximum input voltage: +24Vdc
FunctionDirectionLength resetEnd of reel (trigger printout)End of reel (trigger printout)
3×Relay outputsElectricalIsolated, floating relay contacts
Maximum voltage: 50VdcMaximum current: 0.5A
FunctionGauge FaultPreset Length 1Preset Length 2
2×Pulse outputsElectricalOpto-isolated differential pairs
Output voltage: 5V or user supplied (up to 24V)
Maximum frequency: 250kHz
FunctionQuadrature (1000 pulses/m)Index (1 pulse/m)
CANbus communicationsConnects to a Proton Products AiG2-MID interface display unit
Serial communicationsRS-232 Printer port
Industrial bus communicationsPROFIBUS
OptionsMID-certified forward / reverse roller for direction sensing.
External printer for batch length ticket printing.