InteliSENS® SLM-i4


InteliSENS® SLM-i4


Proton Products InteliSENS® SLM-i4 Series non-contact, unidirectional speed and length gauges provide extremely accurate speed and length measurements for metals industry applications. They are available with extended stand-off distances and greater depth-of-field than the standard InteliSENS® SL Series gauges, which allows them to be used to measure very high-temperature objects such as in hot-rolling processes.

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.

Focused on connectivity the SLM-i4 Smart Sensor with 32bit communications comes preloaded with Profibus, Profinet, and Ethernet Industrial Protocol for your PLC connection. Modbus, OPC-UA, RS232, RS485, and WiFi round out a wide range of digital communications for your Industry 4.0 Solution.

  • No-Slip, No Wear, No Marking
  • 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.
  • Harsh environment enclosures are available from Proton Products on request.


SLM 6060-i4 SLM 100100-i4 SLM 120120-i4 SLM 200200-i4
Stand-Off Distance 600mm
Depth of Field 60mm
Minimum Speed 0.25 m/min
1.0 ft/min
0.40 m/min
1.3 ft/min

0.50 m/min
2.0 ft/min

0.85 m/min
3.0 ft/min

Maximum Speed 3000 m/min
9842 ft/min
6000 m/min
19685 ft/min
10000 m/min
32808 ft/min
10000 m/min
32808 ft/min
Accuracy Factory Calibrated to better than 0.05%.
Repeatability of 0.02%
Measurement Maximum Acceleration Rate of 1000m/s2 (3280ft/s2)
Measurement Rate Up to 25,000/sec
Units Speed Measurement selectable m/min, ft/min, yd/min
Length Measurement selectable m, ft, inch, yd
Mode Normal (Continuous Length), Batch Length
Object Detection Automatic Detection and Object Present


Default Output 5vdc or User Input to 24vdc
Max Maximum Frequency Maximum pulse rate 2MHz (cable length dependent) – Pulse/Meter or
Meter/Pulse Configurable as 6 x Single End or 3 Quadrature or 3 Differential.
Non-Isolated from Gauge Head, Opto Isolated from the PSU-BOB i4

Maximum Input Voltage 30Vdc
2 x Fixed logic Inputs – Laser Enable and Shutter Enable
3 x Selectable logic Inputs – Reverse Direction, Length Reset, Display Hold, Speed Hold, Total Length Reset, End of Reel

RS232 MODBUS RTU, PROTON ASCII code or Label Printer
USB using RS232 – USB Converter Cable
RS485 MODBUS RTU, PROTON ASCII code (Not available with PROFIBUS)

Connects to Proton Products CDi4 Display

Connect to a PLC using PROFIBUS, PROFINET, or EtherNet I/P, data update rate up to 500/sec. Flexible Data Configuration, Big Endian, Little Endian

Ethernet selectable between OPC-UA and Modbus

Connect to a PC or Mobile Device using WiFi 2.4G and use the Proton Products Gauge App available for iOS and Android. Ideal for gauge configuration and diagnostics

Laser Doppler

Class 3B Visible Laser.
Wavelength 650 – 670 nm, typically 658 nm with a beam diameter of 3mm (0.12”)
Total emitted power 80mW. Power Density at Stand Off Distance 1120mW/cm2

Electrical & Operating Requirements


Power Supply Power Consumption Operating Temerature Environmental Protection
18 – 30 Vdc 20 Watts 5°C – 40°C (41°F-104°F)* IP 67

*See Accessories for High Temperature Options

Size & Weight



220mm (8.7”)
130mm (5.1”)
78mm (3.1”)
3kg (6.6lbs)

*See Accessories for High Temperature Options

Industry 4.0

More than 200 Data Words are available to communicate with your Industry 4.0 Solution. Data Words are divided into distinct function groups to make it easy to select the ones you want.
Gauge ID Data Words Model Number, Serial Number, Firmware APP version, Firmware Core Version, Firmware Date
Calibration Data Last Calibration Date, Days Since Last Calibration, Total Run Time, Calibration Alarm
Validation Data Words SNR, Signal Amplitude, Good Readings, FFT Amplitude
Wired Network Info IP Address, Netmask, Gateway
WiFi Network Info IP Address, Netmask, Gateway, SSID
Measurement Data Instant Speed, Average Speed, Batch Length, Total Length
Diagnostic Data Laser Temperature, APD Temperature, Laser ON/OFF Cycles, Laser Power

Product Videos



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