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.

    Bidirectional speed and length measurement; accurately measures speed and length during line stoppage, reversal and creepage.

    UKAS-traceable calibration; accuracy better than 0.05% and repeatability better than 0.02%.

    Rugged industrial design for use in harsh factory environments.

    Available fitted with industry-standard communcations interfaces for easy integration with PLCs and production line equipment.

    Excellent value with low cost of ownership.

Proton Products InteliSENS® SLR Series non-contact, bidirectional speed and length gauges provide extremely accurate speed and length measurements in almost any production environment.

Automatic direction detection and measurement down to zero speed means that the InteliSENS® SLR gauge length measurement counts both up and down, so final length measurements will still be accurate to 0.05% even with production lines that exhibit stoppage, direction reversal and creepage.


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® SLR 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.

Operating principle – Heterodyne laser surface velocimeter

Proton Products InteliSENS® Series speed and length gauges illuminate the measured surface with a precisely pitched 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.

The InteliSENS® SLR series bidirectional speed and length gauges extend this principle by using a high-frequency Bragg cell modulator to illuminate the measured surface with a scanning interference pattern, which generates an oscillating light signal even when the object is stationary. Direction of motion is determined by whether the scattered light frequency is higher or lower than the stationary frequency.

Accuracy*     0.05 %
Repeatability     0.02 %
Acceleration     500 m/s2
Internal measurement rate     100 kHz
Measurement output interval 40     ?s
Laser spot size     3 mm
Operating temperature 5   45 °C
41   113 °F
Environmental protection     IP67  
Weight     3 kg
    6.6 lb
Length     230 mm
    9.06 inch
Width     130 mm
    5.12 inch
Height     75 mm
    2.95 inch
Power supply 15 24 25 VDC
Power consumption     20 W
*only valid if the measured object is positioned within the central 20% of the depth-of-field.


Measurement units (end-user configurable) Speed metres/minute feet/minute
Length metres feet yards
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 (end-user configurable) Electrical Maximum input voltage: +24Vdc
Function Length reset Display hold Length hold
  Speed hold Direction Pause
3×Relay outputs (end-user configurable) Electrical Isolated, floating relay contacts
  Maximum voltage: 50Vdc Maximum current: 0.5A
Function Gauge OK Laser at temp Shutter open Laser on
  Measuring Preset Length 1 Preset Length 2
3×Pulse outputs (end-user configurable) Electrical Opto-isolated differential pairs
  Output voltage: 5V or user supplied (up to 24V)
  Maximum frequency: 250kHz
Function Quadrature Index
Analogue output (end-user configurable) Electrical Output voltage: 0 to +10V (end-user scalable)
Function Speed Good readings
CANbus communications Connects to an optional Proton Products AiG2 interface display unit
Serial communications RS-232 RS-422 / 485
Optional communications (factory-installed, choice of one) PROFIBUS Ethernet/IP DeviceNET
Optional wireless communications (factory-installed, choice of one) Bluetooth
Stand-off distance 150 300 600 mm
5.91 11.8 23.6 inch
Depth-of-field 25 60 60 mm
0.98 2.36 2.36 inch
Maximum speed (bidirectional) 2500 5000 5000 m/min
8200 16400 16400 ft/min