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VLM320 |
Non-contact measuring of length and speed |
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Why non-contact measuring?
With optical sensors, completely new perspectives are opened for industries in the fields of quality
maintenance and automation processes. Length and speed can be measured exceptionally precisely, without
contact and thus without wear; where the usual methods either cannot be used owing to process conditions
or are not sufficiently exact.
With the VLM 350, ASTECH offers anexceptionally robust and dependable sensor,
which has been specifically tailored to the requirements of
industrial use. Regardless of material, the VLM 350 measures lengths and speeds without contact and its
interfaces allow it to be integrated optimally to automation and quality maintenance processes in many
branches of industry.
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Function Description
The VLM320 operates optical with non-contact and implemented based on a CCD sensor the spatial filter principle.
Spatial filter is the generic term for a non-contact measuring principle for determining the speed and length of moving materials.
The spatial filter based on the filtering action lattice-like structures (grid modulation).
One can simplify the function of the VLM320 described as follows:
The measuring object is imaged through the lens on the CCD array. The CCD array operates as an optical grid (no picture shooting).
For illumination of the object is an integrated light source (LED). Ambient light interference is effectively suppressed by the process.
Because of the grid modulation is created by movement of the object, a signal frequency that is proportional to speed.
From the measured signal frequency is calculated the speed and length in the unit.
Multiple ontrol loops allow the automatic adaptation to different materials (texture and brightness of the material).
Robust and precise
The VLM320's robust construction allows it to be operated in rugged industrial environments and
also enables it to measure speed and lengths in a wide range of processes, leading to exactness and
a high measuring dynamic.
Less servicing
Its contact-free measuring system allows the VLM320 to operate not only more precisely than
other existing systems, but also without wearing out, as the absence of friction reduces the need
for servicing. Damaging or dirtying of the measuring surface do not arise at all.
Flexible and multi-sided
The VLM320 operates autonomously; sensor, light source, signal processing and power supply
are all integrated in the unit. The user is guaranteed highly flexible operation by the digital
system concept, which places a wide range of functions at his disposal. Via its interfaces, the
VLM 320 can easily be hooked up to existing processes, drives or data acquisition. It is easy
to set-up and to operate.
Standard package as a Set
Due to the complete package the VLM320 is quick to use:
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- Gauge VLM320
- Printed manual in German or English
- CD with documentation in German and English and PC software for configuration VLMTERM
- Programming cable, power cable, connectors for I/O
- Alignment measuring distance, cover plug for programming port
- Parameter list and wiring diagram
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Connections Ports (as Standard)
The standard interfaces usefull for most applications:
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- Programming interface (RS232, bus compatible)
- Pulse output with 2 phases A and B (24V passive, to 25 kHz, resolution 5ns)
- utput error (device has extensive self-diagnostics)
- Output status (programmable)
- Standby input
- Trigger input
- Direction input (alternatively as a second trigger input when using two light barriers)
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Powerful Options
Extensive expansion options make the VLM320 even more versatile:
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- Profibus(IFProfi)
- Two additional pulse outputs with 5V/2MHz (IF3-5V), passive 12 to 24V/25kHz (IF2) or active 24V/50kHz (IF2-PP)
- Analog output 4/0 to 20 mA (IF1)
- Second digital interfaces RS422/485 or RS232 (IF1)
- Automatic direction detection (FB2DIR)
- Mounting plates (MP3 and MP3R)
- Protection and cooling housing (CB5)
- and more...
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Technical data
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| Speed measuring range |
0.001 up to 50 m/s *) |
| different measuring distances |
170, 185, 240 *) |
| Measuring deviation as per DIN 1318 |
0.025% *) |
| Detector |
CCD line |
| Light source |
LED |
| Power supply |
230V/AC or 24V/DC |
| Power requirement |
< 20W |
| Temperature range |
0 to 50 °C |
| Protection type |
IP 65 |
| External dimensions |
360 mm x 160 mm x 90 mm *) |
| *) depending on model |
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Performance and advantages
The VLM 320 lays down hardly any conditions as to the surface structure of the object to be measured.
Measurements can be made just as precisely on the periodic structures of textiles as on the stochastic surfaces of metals, wood, rubber or paper.
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 Advantages
- Contact-free
- no slippage or wearing out
- unaffected by material
- robust and precise
- economical
- unaffected by dirt
- many-sided interfaces
- easy installation
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Wide range of application
- Metal, paper, cardboard, synthetic materials, wood, rubber.
- Belts, pipes, strips, plates, foils, profiles, wire, cables.
- Cutting, positioning, localizing, monitoring, quality maintenance, dosing.
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Visit the side VLM Series Applications.
You can download application briefs written in different languages. |
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Data sheet of the VLM320 Series. You can find a short overview of the gauges of the VLM320 series. |
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Here are the differences to the VLM250.
Newsletter "The new VLM320" |
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About the warranty period for VLM320 Series:
36 month warranty (German). |
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Information on the Profibus for VLM320, see the description of the interface card IF-Profi. |
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You need a sollution for your measurement task?
Please contact us: e-mail or phone. |
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Please request a quote via e-mail or FAX. Please describe the application and indicate the speed range and desired interfaces. |
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Inside the Download Area yon can find the user manual as PDF file.
Or download the Windows-Programme "VLMTERM" (freeware). |
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