PROTON , PROTON Vietnam , PROTON Viet nam


  • 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 Directives 2014/32/EU 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 InteliSENS® 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 Directives 2014/32/EU 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.

InteliSENS® 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 InteliSENS® SL-MID Series is fully certified to Class 1 accuracy (0.125%) for final shipping length measurement for products destined for EU-markets (EU Directives 2014/32/EU 2004/22/EC).

Operating principle – Laser surface velocimeter 

Proton Products InteliSENS® 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.


Accuracy     0.125 %
Acceleration     500 m/s2
Internal measurement rate     100 kHz
Measurement output interval 40     µs
Laser spot size     3 mm
Operating temperature 5   45 °C
Environmental protection     IP67 -
Weight     3 kg
Length     230 mm
Width     130 mm
Height     75 mm
Power supply 15 24 25 VDC
Power consumption     20 W
Measurement units Speed metres / minute
Length metres
Laser safety control inputs Laser An external closed SPST contact enables the laser diode.
Shutter An external closed SPST contact opens the laser shutter.
2×Logic inputs Electrical Maximum input voltage: +24Vdc
Function Direction Length reset End of reel (trigger printout) End of reel (trigger printout)
3×Relay outputs Electrical Isolated, floating relay contacts
Maximum voltage: 50Vdc Maximum current: 0.5A
Function Gauge Fault Preset Length 1 Preset Length 2
2×Pulse outputs Electrical Opto-isolated differential pairs
Output voltage: 5V or user supplied (up to 24V)
Maximum frequency: 250kHz
Function Quadrature (1000 pulses/m) Index (1 pulse/m)
CANbus communications Connects to a Proton Products AiG2-MID interface display unit
Serial communications RS-232 Printer port
Industrial bus communications PROFIBUS
Options MID-certified forward / reverse roller for direction sensing.
External printer for batch length ticket printing.
Stand-off distance 300 mm
Depth-of-field 60 mm
Minimum speed 0.2 m/min
Maximum speed 5000 m/min
Minimum single length measurement 10 m
Scale interval 1 mm
Accuracy class 1 -