InteliSENS® SLR-i4


InteliSENS® SLR-i4

Savings Calculator


The InteliSENS® SLR-i4 non-contact speed and length measurement gauge is ideal for flat surface products in “roll to roll” or “cut to length” processes. Paper, Film, Foil, Wovens, Non-Wovens, Textiles, Roofing, Sidings, Gypsum Board are just a few examples. Applications where speed measurement is critical for drive control or where length measurement is critical for product quality will benefit from the increased accuracy of Laser Doppler Speed and Length Measurement.

Focused on connectivity the SLR-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 Moving Parts, Increased Reliability and MTBF
  • No Slip, No Wear, No Marking
  • Incredibly small and easy to install
  • Stand Alone Measuring Device or Fully Integrated to PLC
  • Pulse outputs like your encoder
  • Industry 4.0 Data Communications


  SLR 1525-i4 SLR 3060-i4 SLR 6060-i4
Stand Off Distance 150mm
Depth of Field 25mm
Minimum Speed 0 m/min
0 ft/min
0 m/min
0 ft/min

0 m/min
0 ft/min

Maximum Speed 2000 m/min
6562 ft/min
3000 m/min
9842 ft/min
3000 m/min
9842 ft/min


Factory Calibrated to better than 0.05%.
Repeatability of 0.02%


Maximum Acceleration Rate of 1000m/s2 (3280ft/s2)
Measurement Rate Up to 25,000/sec


Speed Measurement selectable m/min, ft/min, yd/min
Length Measurement selectable m, ft, inch, yd


Normal (Continuous Length), Batch Length

Object Detection

Automatic Detection and Object Present


Pulse Outputs x 3

Default Output 5vdc or User Input to 24vdc
Max Maximum Frequency 1MHz Pulse Rate Selectable - 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

Logic Input x 2

Maximum Input Voltage 24Vdc
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

Relay Outputs x 3

Maximum Voltage 30Vdc, Current 100mA.
N-Channel MOSFET pull-down (for connection to user supplied onto isolated relay)
1 x Fixed Logic Output - Shutter Status
3 x Selectable logic outputs - Gauge Ok, Measuring Speed, Preset Length 1, Preset
Length 2, Good Readings Low, Object Detected, Gauge Hot.

Relay Outputs x 3

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)

Relay Outputs x 3

Connects to Proton Products CDi4 Display

Relay Outputs x 3

Ethernet selectable between OPC-UA and Modbus

Image Image
Relay Outputs x 3

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

Image Image Image
i-BUS x 1

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

1 Analogue Output

Speed, Good Reading

Laser Doppler

Class 3B Visible Laser.
Wavelength 650 - 670 nm, typically 658 nm with a beam diameter of 3mm (0.12”)
Total emitted power 40mW. Power Density at Stand Off Distance 50mW/cm2 

Laser Doppler

Electrical and Operating Requirements

Power Supply
18 - 30 Vdc 

Power Consumption
25 Watts 

Operating Temperature
5°C - 40°C (41°F-104°F)*

*See Accessories for High-Temperature protection options

Environmental Protection
IP 67

Size and Weight


220mm (8.7”)

130mm (5.1”)

78mm (3.1”)

3kg (6.6lbs)

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