Process, Instrumentation & Environment

Density meter DWF - Kobold

The displacer rod, which is attached to a measuring spring by a chain, immerses into the liquid and is subject to a buoyant force proportional to the mass of the displaced liquid.

Every change in the weight of the rod corresponds to a change in the length of the spring and is therefore a measure of the liquid level. The longitudinal expansion of the spring, i.e. the travel of the rod, will be transmitted from the measuring space to the indicator unit by means of a magnetic coupling. The basic version of the indicator consists of a scale with a pointer for displaying the liquid level. As an option, the indicator unit may be equipped with electrical transmitters for remote display or with limit switches.
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If the device cannot be installed from above, because, for example, a stirrer is mounted in the container, a special displacement vessel is available for lateral installation.

Since the buoyancy of the displacer rod depends on the density (g/L or kg/m3) of the measured medium, it must have been designed for the specific liquid to be measured.

  • Measuring range: 700 ... 1900 g/l;
  • Flow: max. 2500 l/h, 5000 l/h or 10000 l/h;
  • Connection: flange DN25 ... DN50;
  • Material: stainless steel or Hastelloy®;
  • pmax: PN16 (PN40 on request);
  • Temperature range: -20 ... +150°C;
  • Accuracy: ±1.25 ... 6 g/L (Mechanical pointer indication);
  • Options: 4-20 mA, contacts, Hart®, Profibus® PA.
  • Especially suited for multiphase media;
  • No bypass required;
  • Robust design;
  • Clear 90° -scale.
  • A large spectrum of wetted materials;
  • Density metering, -monitoring, and controlo f liquid media in pipes;
  • Excellent heat tracing technology (option);
  • High-pressure application (option);
  • High-temperature application (option);
  • Magneto-resistive signal transmission;
  • Process monitoring and control;
  • Processes under difficult and rough operating conditions.

F.Fonseca is the representative of Kobold in Portugal.
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