SLR Series of 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 SLR gauge length measurement counts both up and down, so the 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, paper tube winding, 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.

The SLR Series gauges are money-saving, direct replacements for traditional problematic and high-maintenace contact wheel and roller-type devices and are extremely easy to install and operate. 

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Model   SLR1525 SLR3060 SLR6060 SLR120120
Minimum speed (m/min) 0 (Zero Speed) 0 (Zero Speed) 0 (Zero Speed) 0 (Zero Speed)
Maximum speed (m/min) 2500 5000 5000 1000
Stand-off distance (mm) 150 300 600 1200
Depth of field (mm) 25 60 60 120

All models above also have the following specifications:

Direction detection Automatic
Accuracy Better than 0.05%
Repeatability Better than 0.02%
Acceleration >500ms2
Measurement update rate 40µs (0.04ms) [1 measurement = 1 scan]
Power requirement 15 -25Vdc, 20 Watts
Protection rating IP67
Temperature range 5°C ~ 40°C
Gauge dimensions L220 x W140 x H90mm
Gauge weight 3kg
Laser spot size 4mm diameter
Units of speed m/min, ft/min
Units of length m, ft, yd
5x digital inputs 2 fixed: Laser enable; Optical shutter enable
  3 programmable: Reverse direction; Length hold; Display hold; Speed hold;
  Reset (length or reel number); End of reel. Max input 24Vdc
  Max Input: 24Vdc
3x relay outputs Volt-free contact; Max. voltage 50Vdc 0.5A
  Gauge OK, Gauge measuring, Laser on, Laser at temp, Shutter open
  (Status indicators) Preset length 1, Preset length 2
Serial I/O Selectable RS232, RS485, RS422: Speed, Length, GR, (status indicators). Bluetooth
CANBUS Connects to Proton products range of SiDI AiG2 & AiG3 indicators
  Can be used to supply power to gauge head
Analogue output 0 - 10Vdc scaleable output based on speed or on good readings
3x pulse outputs Opto-isolated differential outputs, configurable as quadrature or index
  Default output 5V or user input to 24Vdc max. Max. Pulse output up to 1Mhz
Additional protocols Profibus, Ethernet, DeviceNet, Modbus, ProfiNet, Industrial Protocol, and SSI available
  • Non-Contact, high speed, solid-state laser speed and length measurement with no slippage, drift or mechanical wear and greatly reduced maintenace 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 communications interfaces for easy integration with PLC's and production line equipment
  • Excellent value with low cost of ownership

The SLR 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 mills
  • Paper tube winding
  • 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 Display module AiG2-SL - Display module
  • Connects via the CAN-bus port
  • Displays measured speed and length
  • Provides menu-based setting of all parameters
  • Bright vacuum fluorescent dot matrix display
  • Mounts directly on the gauge body or remotely via an extension cable
       CAN-bus cable
CAN-bus cable - For connecting the gauge to an AiG2 interface display unit
  • Available in 5, 10, 15, 20, 30 and 50m lengths
PSU-BOB-SL Power supply, break-out box and laser safety key switch PSU-BOB-SL - 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 “INTERFACE” connector input and output pins
  • 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 – 260 VAC @ 45 – 65Hz
    DB25 Cable
DB25 Cable - For connecting the gauge "INTERFACE" port to a PSU-BOB-SL, Terminal Strip-DIN or CS1G-SL
  • Available in 3, 5, 10, 20 and 30m lengths
   RJ45 to DB9 converter
RJ45 to DB9 converter
  • For connecting RJ45 8P8C terminated cables to the DB9 EtherNet/IP port
PCIS_SL PC Interface Software PCIS_SL - 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, pre-sets and alarms
  • Gauge to PC connection via RS-232 or optional RS-232-to-USB interface cable (RSCon)
       SL Laser Gaurd PHA-1
SL Laser Gaurd PHA1 - LAser safety enclosure for PHA-1 (with or without side skirts)
  • Mounts to a PHA-1 to prevent accidentla viewing of direct and reflected laser beams
  • Integrated interlock switch engages the gauge laser shutter whenever the guard cover is opened
  • Side skirts contain reflected laser radiation from highly-reflective objects
Air wipe SLMKII Air wipe SLMKII
  • Provides a constant flow of clean air over the laser window to disperse dust, debris or steam
  • Easily detached by a quick release screw for cleaning
  • Provides an 8mm push fit tube fitting to connect to a clean air source
For further information or enquiries Give us a call or fill in our online enquiry form
+44 (0)1823 333343