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African Petrochemicals is Africa’s leading bi-monthly print and digital trade magazine featuring all the latest petrochemical industry news, special reports, technological advances etc.

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Vibrating limit level detection

KOBOLD, represented locally by Instrotech, has on offer their Kobold NSV level monitors to measure low-density (powdery), fine-grained bulk solids, such as plastic granules, cement, and food like flour, sugar and animal feed.  The devices work by the vibrating fork principle.  The fork, specifically designed for use in bulk solids, continuously vibrates, and when it is covered by a medium, the vibration behaviour changes. When the device detects this change, it is displayed on a red LED. An additional relay output is provided for signal transmission.


The NSV limit level detectors are ruggedly, but compactly constructed of stainless steel and are insensitive to humidity in materials. Mounting is possible from the top and from the side of a bin, so devices are not only suitable for protection against over-filling, but also signal minimum level accurately. Mountable evaluation electronics are well protected at the top of the device ending in a protection class IP 65 plastic terminal box.

Specific versions with elongated neck pipe of up to 3m, make it easy to install vibrating forks in varying heights. The devices have no mechanical moving parts and are thus virtually maintenance-free. The NVS can be used in explosion-proof areas according to ATEX II 1/2 D Ex tD A20/A21.


  • Special lengths up to max. 3000 mm
  • No calibration necessary
  • Insensitive to moisture
  • Compact installation
  • Stainless steel fork 1.4305
  • Relay output
  • Suitable for low bulk densities from 60 g/l
  • Suitable for ATEX- applications

For more information on Kobold’s NSV vibrating level monitors, contact Instrotech on 010 595 1831 or sales@instrotech.co.za

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