Microphonic Cable Technology


FLEXMIC is a detection system for structure-borne noise, based on a piezoelectric microphonic cable. The sensor cable’s operating principle guarantees both high sensitivity and a wide frequency spectrum, and the compact design and integrated logic functions make this system of interest for industrial applications. The system is particularly suitable for monitoring flexible and rigid mesh fencing, and metal grid fences.


Monitoring of wire mesh fences and other lightweight fences, and any structure able to carry structure-borne noise.


  • Detection of structure-borne noise
  • Digital signal processing and filtering
  • Multi-level signal correlation
  • IOs for external systems available
  • Software updateable via download
  • Addressable on RS-485 bus system
  • Individual or networked operation
Power supply12-48 VDC (max 6W)
Interfaces1x RS-485 electrically isolated
1x USB
EvaluationMultiprocessor system with digital signal filtering
Sensor connections2 or 4 channels
Relay outputs8x changeover contacts max. 0.6A load
Inputs8x monitored inputs
Other outputs1 software-controllable audio output
1 mini speaker for audio or as alarm beeper
Plug-in modules
2 modules with 2 channels each
Sensor cable length MC2A200m per channel
Number of evaluation units per systemmax. 64
Dimensions(H x W x D) 50 mm x 160 mm x 100 mm
Working temperature-35°C bis +85°C
HousingModule housing for DIN standard rail
Die cast aluminium (H x W x D) 170 mm x 200 mm x 90 mm or 19 “module
or housing to customer specification

Microphone cables are laid on the fence along the track to be monitored.
The sensor cable is usually attached to the fence using weather-resistant cable ties or is concealed within the construction. For some fence panels special installation kits are available for concealed cable installation. The cable absorbs material vibrations (structure-borne noise), the downstream evaluation unit then evaluates the sensor signals and reports attempts to break in or out.
The evaluation units can be operated both as individual electronics and as part of a networked system. The electronics offer the option of real-time local signal correlation to minimize unwanted signals resulting from environmental influences.
This function is extended by installation-wide correlation where evaluation units are networked.
Up to 64 FLEX units can be networked to a central hub (e.g. MASTERCENTRAL) via various interfaces. Alongside the data interfaces a wide range of IO modules exist, through which further information can be captured and put out.

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