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African Petrochemicals is South Africa’s leading bi-monthly print and digital trade magazine for the past 15 years. Featuring all the latest petrochemical industry news, special reports, technological advances etc.

Stay Cool in Flow Monitoring

Calorimetric Electronic Flow monitor for Air

Nowadays, almost all air conditioning, conveying or exhausting systems need monitoring of gas flow. Gas flow monitors are required to have high reliability and minimal pressure loss.  KOBOLD, represented locally by Instrotech, has on offer to all users, an optimal solution with the flow monitor of the KAL-L series.

The KAL-L works according to the calorimetric principle.  The sensor is heated up to a few degrees above the medium temperature. When the medium flows, the heat generated in the sensor is transferred to the medium, i.e., the sensor is cooled. This cooling process is a measure of the flow velocity. A second sensor measures the medium temperature. The compact mounted electronics compares the resistance of both sensors by means of a Wheatstone bridge circuit, and switches an output relay if the actual value drops below the set switching value. In addition to the 2-colour LED indication, the current flow rate can also be read on a 8-digit LED bargraph.  The adjustable switching range between 1-20 m/s fulfills the specifications of almost all systems.


KAL-L features:

  • Measuring range – 1 – 20 m/s air
  • Accuracy: + 10% of reading
  • Pmax:8 bar; tmax:120°C
  • Relay-output
  • No moving parts
  • Negligible pressure loss

The installation by compression fitting or clamping flanges also allows retrofitting into existing plants.  For more information on Kobold’s KAL-L Calorimetric Air Flow Monitor contact Instrotech on 010 595 1831 or sales@instrotech.co.za


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