Non-contact unidirectional speed/length measurement

Scantron has over three  decades of non-contact surface measurement experience. This SL Series gauge is one of most popular speed and length measurement solutions.

The SL Series of non-contact, unidirectional speed and length gauges provide extremely accurate speed and length measurements in almost any production environment.

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.

SL 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.

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Contact our sales team via email regarding this product: +44 (0)1823 333343

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Minimum speed(m/min)
Maximum speed(m/min)25005000500010000
Stand-off distance(mm)1503006001200
Depth of field(mm)256060120

For all Gauge Models above:

AccuracyMaximum 0.05%
RepeatabilityMaximum 0.02%
Measurement update rate40µs (0.04ms) [1 measurement = 1 scan]
Power requirement15 -25 Vdc, 20 Watts
Protection ratingIP67
Temperature range5°C ~ 40°C
Gauge dimensionsL x W x H 230 x 130 x 75mm
Gauge weight3kg
Laser spot size4mm diameter
Units of speedm/min, ft/min
Units of lengthm, ft, yd
5x digital inputs2 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
3xRelay outputsVolt-free contact; Max. Voltage 50Vdc 0.5A
Gauge OK, Gauge measuring, Laser on, Laser at temp, Shutter open
(Status idicators) Preset length1, Preset length 2
Serial I/OSelectable RS232, RS485, RS422: Speed, length, GR, (status indicators). Bluetooth
CANBUSConnects to Proton products range of SiDI AiG2 & AiG3 indicators.
Can be used to supply power to gauge head.
Optional communications (factory-installed, choice of one)Profibus, Ethernet/IP, DeviceNET,
Optional wireless communications (factory-installed, choice of one)WiFI, Bluetooth
  • 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
  • Unidirectional speed and length measurement
  • 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 PLCs and production line equipment
  • Excellent value with low cost of ownership

The SL is a very versatile piece of equipment and is suitable for a wide range of applications where unidirectional speed and length measurement, to high degrees of accuracy, is required.

The SL is a very versatile piece of equipment and is suitable for a wide range of applications where unidirectional speed and length measurement, to high degrees of accuracy, is required.

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:

aig2-sl1AiG2-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-busCAN-bus cable - For connecting the gauge to an AiG2 interface display unit
Available in 5, 10, 15, 20, 30 and 50m lengths
psu-bobPSU-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
db25DB25 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
rj45RJ45 to DB9 converter
For connecting RJ45 8P8C terminated cables to the DB9 EtherNet/IP port
pcis-softwarePCIS_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-guardSL 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-wipeAir 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