SLR mini series gauges offer speed and length measurement for bidirectional production lines. The gauge senses the direction of motion and will automatically increment or decrement the length accordingly. SLR mini gauges are thus suitable for production lines that undergo direction reversals or stationary (zero speed) periods.
The SLR mini series of laser speed and length gauges provide highly-accurate, non-contact speed and length measurement.
Compared to traditional contact wheel encoders, SLR mini non-contact speed and length gauges offer the following advantages:

  • Capable of measurement at much higher speeds and accelerations
  • No slippage
  • Greater accuracy
  • No wear or damage to the measured object
  • Solid state design results in higher reliability and MTBF

RS-232 and Ethernet communication interfaces are installed as standard for straightforward connection to computers or PLCs. One optional industrial standard communication interface (PROFIBUS, EtherNet/IP or DeviceNET; replaces the standard Ethernet interface) may also be installed in the gauge.
User configurable digital inputs are provided as standard to reset gauge measurements and trigger printing. User configurable digital outputs are provided as standard to signal gauge status and pre-set length reached.


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Specification - Zero-speed and bidirectional Units SLR1220 SLR3060
Minimum speed m/min 0 0
Maximum speed m/min ±5000 ±5000
Nominal stand-off distance mm 120 300
Depth of field mm 20 60

All Models above have the following Specifications:

Accuracy Maximum 0.05%
Repeatability Maximum 0.02%
Maximum acceleration >1000
Internal measurement rate 200kHz
Measurement update time 200 kHz internal and 20µs at the outputs
Power requirement 24Vdc, 8 Watts
Protection rating IP67 (harsher envoronments possible with an optional environmental enclosure)
Operating temperature 5° ~ 45°C (higher temperatures possible with an optional environmental enclosure)
Gauge dimensions L x W x H 140 x 105 x 50mm
Laser beam diameter 4mm
Laser safety classification Class 3B
Diagnostic display Integrated LCD
Pulse outputs 2xpluse outputs or 1xquadrature output, freely programmable, pulse rate <1MHz
Digital inputs Laser enable;  Shutter enable;  3 programmable inputs
Digital outputs Shutter status;  2 programmable outputs
Standard communications interfaces RS-232;  Ethernet TCP/IP (Mopdbus protocol)
Display communications Proton CANbus for optional SiDi-CDI interface display
Optional communications interfaces
(replaces Ethernet TCP/IP interface)
PROFINET          DeviceNet
PROFIBUS          EtherNet/IP
  • Non-contact, high-speed, solid-state laser speed and length measurement with no slippage, drift, mechanical wear or maintenance compared with contact wheel/roller systems

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

  • Ultra-compact design with a footprint comparable to a smartphone

  • Optimised for sheet material and converting applications

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

  • Rugged industrial design for use in facory environments

  • Avaliable fitted with industry-standard communications interfaces for easy integration with PLCs and production line equipment

  • Excellent value with low cost of ownership

The miniSLR is a very versatile piece of equipment and is suitable for a wide range of applications.
Here's a short list of some of the industries where our customers have benefited from our non-contact laser measurement systems:

  • Flooring and carpet
  • Abrasive paper
  • Roof foil
  • Adhesive tape
  • Cold metal
  • Paper
  • Packaging material
  • Construction & insulation material
  • Special extrusion and calendaring
  • Ceramics
  • Cord, lead
  • Stranded products
  • Insulated products

The following are some of the applications covered:

Cut to Length Control  Elongation or Speed Control  Encoder Calibration

 Inkjet Print Control  Part Length Measurement  Speed Balancing

Speed Measurement  Speed Synchronisation  Spool Length


AiG2-SL/SLR - Display module
  • Connects via the CANbus port
  • Displays measured speed and length
  • Provides menu-based settings of all parameters
  • Bright VFD dot matrix display
AiG2 Panel Mount Kit
AiG2 Panel Mount Kit
  • Bracket for mounting the AiG2 to an end-user panel
CAN-bus cable
CAN-bus cable - for connecting the gauge via a PSU-BOB mini to a CDi interface display unit
  • Available in 1, 5, 10, 20, 40, 60 and 100m lengths
PCIS SL/SLR mini - PC Interface Software
  • PC-based software package
  • User-friendly graphical user interface
  • Displays all measurements
  • Provides menu-based setting of all parameters
  • Provides trending, data logging, presets and alarms
  • Gauge to PC connection via RS-232


PSU BOB mini

PSU-BOB mini - Power supply, break-out box and laser safety key switch
  • Connects via the DB25 “INTERFACE” connector
  • Supplies 24VDC electrical power to the gauge
  • Provides screw terminal access to all electrical input and output pins
  • Provides DB9 connectors for access to the CANbus, RS232 and optional industrial bus communications ports
  • Provides a RJ45 connector access to the ethernet port
  • End user cables are sealed with three cable glands
  • Provides a laser enable key switch for compliance with laser safety requirements
  • Input voltage range: 90 – 260VAC @ 45 – 65Hz
DB25 Cable
DB25 Cable - For connecting the gauge "INTERFACE" port to a PSU-BOB mini
  • Available in 1, 3, 5, 10, 20 and 30m lengths
Terminal_Expander Terminal Expander - Gauge-mounted break-out bos
  • Connects the DB25 “INTERFACE” connector
  • Provides DB9 connector access to the RS-232, CANbus, Ethernet or optional industrial bus communications ports
  • Provides screw terminal access to all electrical input and output pins
  • End user cables are sealed with cable glands
Industrial Bus Module
Industrial Bus Module - For connecting the gauge to industrial communications buses, such as used with PLCs
  • May be retrofitted
  • Protocols: DeviceNET; PROFIBUS; PROFINET; EtherNet/IP
Base Plate
Base Plate
  • For securing a SL/SLR mini gauge to a mounting surface
Vibration Reducing Kit
Vibration Reducing Kit
  • For use with the above Base Plate in high-vibration environments
3D Adjuster Plate
3D Adjuster Plate
  • For use with the above Base Plate for precision alignment of the SL/SLr mini gauge to the measured object
  • Provides ±3o of roll and yaw adjustment
Adjustable beam enclosure tube Laser Protection Tube for SL/SLR mini 1220
  • Enclosure of the laser beam to within 10mm of the object for laser safety and harsh environments
Laser Protection Tube Laser Protection Tube for SL/SLR mini 3060
  • Enclosure of the laser beam to within 10mm of the object for laser safety and harsh environments
Air Wipe
Air Wipe
  • High-efficiency, air-wiped protection window for dusty/steamy environments with a quick-change window release mechanism
  • Provides an 8mm push fit tube fitting to connection to a clean air source
Cooling Plate Cooling Plate
  • Air or water cooled plate for installation between the gauge and mounting surface
  • For use in ambient temperatures up to 60°C
For further information or enquiries Give us a call or fill in our online enquiry form
+44 (0)1823 333343