VLM 502: Velocity & Length Measurement

Based on the design of the VLM 500, the VLM 502 boasts many of the same benefits and features as its predecessor. Both the VLM 500 and VLM 502 utilize a CCD Sensor to accurately measure.  Speed is measured by using the spacial filter principle (grid modulation), and length is measured by integration over time (light reflection). The VLM 502 enables non-contact speed and length measurements within limited space requirements, due to its small gauge head. For more information, please refer to the data sheet or contact us with any questions.

Operating Principle:

CCD Sensor

Features:

• Contactless optical
• Velocity up to 50 m/s
• Measuring uncertainty ±0.025 %
• Working distance: 85 mm
• Slip free
• Nonwearing
• Nearly material independent
• High-Power illumination-LED
• No harmful LASER-light
• Robust and precise
• Insensitive against impurity
• Various interfaces
• Easy installation
• Nearly maintain free at a lifetime of > 15 years
• PC-Software for parameterization
• 60 months warranty
• Made in Germany

Application:

• Able to measure on almost all surfaces and materials
  (e.g. metal, paper, textiles, plastics, ceramic, wood, rubber)
• Suitable for various cases of applications
  (e.g. cutting, positioning, regulation, inspection, quality control)
• Applicable for a wide range of product profiles
  (e.g. strips, rails, plates, foils, tubes, cables, wires, robes, etc.)
• Length and speed measurement at winders, slitting lines, coating and inspection lines
• Velocity measurement in paper machines for example at paper pulp, web and paper
• Tube and profile length inspection and provision of velocity signals for testing purposes
• Velocity and cutting control for extruders

Specification:

Technical Data

• Nominal distance and working range 85 ± 15 mm
  – extended working range 85 ± 15 mm
• Measuring range 0,60 … 1500 m/min
  – in extended working range 1,20 … 3000 m/min
  – with special filter board FB2V 0,36 … 210 m/min
  – in ext. working range and FB2V 0,72 … 420 m/min
• Measuring uncertainty 1) < 0,025 % at nominal working distance
  < 0,05 % in working range and < 0,2 % in extended working range
• Reproducibility 2) < 0,025 %
• Averaging- Update-Time > 0,2 ms with additional 1 … 32 times sliding average
• Length measuring range Internal length range up to 2.000.000 km
• Detector / principle CCD sensor / spatial filter with semiconductor grid as reference
• Illumination White light LED, expected life span: > 5 years 3)
• State indicator (VLM502 – E) Signal (Green), Error signal (Red) , Communication (Yellow),
  Forward (Green), Backward (Green)
• Power supply, consumption 24 VDC, max. 25 W
• Temperature range 0 °C … 50 °C
• Protection class VLM502 – E: IP 65, VLM502 – O: IP65
• EMC Industrial standard in compliance with CE
• Weight, Housing dimension VLM502 – O: 1,7 kg, 163 mm x 137 mm x 67 mm
  VLM502 – E: 2,2 kg, 140 mm x 140 mm x 91 mm
  Connection between VLM502 – O and VLM502 – E: 3 m

  Interfaces

• Programming interface (max. 2)
  for parameter setting, data output and firmware update
  USB (IUSB), RS-232 (I232), RS-422 (I4U4), isolated
• Outputs 4) 2x (Error signal, Signal status)
• Inputs 4) 3x (External trigger signal, Standby 5), Direction)
• Pulse-output (Encoder) A/B, 2 phases 90°, resolution 8 ns, 0,2 Hz … 50 kHz
  Optionally as Open Collector, 5V active 6) or Push Pull 6)
• Analog output Current output, adjustable as 0 … 20 / 0 … 24 / 4 … 20 mA
• Fieldbus interface Profibus DP (IFPB), Telnet via FastEthernet (IFFE), Profinet IO (IFPN)