Visual level indicators combine up to three functions in one instrument: level indicator, level switch and level transmitter. The display that can be read even over large distances works without energy and automatically as a result of the physical law of liquids in communicating vessels.

 

The WEKA visual level indicators are characterized by their compact design and the wide range of applications.

The WEKA operating principle with a horizontal bar magnet ensures clear and reliable control of the indication rail, switch and transmitter. And this applies even to the largest wall thickness of the float standpipe. Like a compass needle, the float in the standpipe is always aligned with the patented magnetic guide tape that is integrated into the indication rail. Maximum functional flexibility is combined with the advantages of the high field density of the bar magnet! A separate permanent magnet is integrated into each indication flag. As a result, the indication flags are magnetically coupled and stabilized in their position. Together with the damping effect of the magnetic guide tape, clear level indication is also ensured under difficult operating conditions (for example changing levels, vibrations). Selected magnetic materials with a negligible degradation of magnetic flux ensure that the functional advantages of the WEKA bar magnet principle are maintained up to highest operating temperatures. The low weight of the WEKA bar magnet principle allows a lightweight design of the floats and, as a result, an extremely compact, material-saving and modern design of the standpipe. The floats also ensure the highest possible diameter difference between float OD and standpipe ID – an important advantage when very dirty or highly viscous liquids need to be measured.

Wide application range


Operating pressures can range from a vacuum up to 500 bar as well as calculation pressures for the float standpipe up to the nominal pressure PN 630. Liquid densities > 0.27 g/cm3 as well as a temperature range from 77 K to 673 K (-196 °C to 400 °C) allow use in applications for cryogenic liquid gases as well as in water hydraulics and steam boilers. Hermetically sealed floats for condensing media are available up to a max. operating pressure of 320 bar.

 

Flexibility through choice of suitable materials

  • Standard materials: 316/316L 1.4435/1.4404, group A4 stainless austenitic steel
  • Other possible stainless austenitic steels: 304/304L 1.4301/1.4306, 1.4571, 321, 1.4541
  • Stainless steels with higher molybdenum content such as: 1.4539 (904L; UNS N08904), 254 SMO (UNS 31254)
  • Nickel alloys and special metals such as: Inconel/Incoloy/Hastelloy, titanium alloys, zirconium, tantalum, aluminum alloys
  • Plastic materials: PVDF, PP, PE, PVC, ECTFE coating (Halar), PTFE-PFA lining, Teflon PFA coating.
  • All non-magnetic materials are generally possible, should the application demand it!

 

Energy-free, automatic operation


The WEKA visual level indicator is ideal for the commissioning of systems. The display works without energy and automatically as a result of the physical law of liquids in communicating vessels. Independent of a controller - and thus also independent in the event of a power supply failure - visual level indication on site is ensured.
 

Excellent readability


The wide, red- and silver-colored flag indicator system is easily and clearly readable, even from over large distances. The fully transparent flag indicator system made of polycarbonate (PC) also ensures readability from the side. The liquids, which are not always unproblematic and sometimes also hazardous, are safely enclosed in the dense and pressure-tight float standpipe and separated from the indicator.

The excellent readability of the level indicator is not impaired by turbidity or the translucence of the liquids to be measured.

 

Level measurement à la carte


As described, WEKA visual level indicators offer the ideal solution for almost all operating conditions. For most applications, you will find a suitable device from our standard program. Again and again, however, customized solutions are also required for special operating conditions. Many designs can, for example, also be used in hazardous areas according to ATEX or IECEx. (ATEX is a widely used synonym for the ATEX Guidelines of the European Union.) The designation ATEX is derived from the French abbreviation for ATmosphèreEXplosibles. Our instruments can thus also be used in potentially explosive atmospheres.

Benefit from our many years of experience! Based on the tried and tested and patented WEKA magnet system for the float and the indication rail, we have developed and built visual level indicators according to specific customer requirements for more than 40 years. If necessary, our standard interfaces to your control system can also be installed on these instruments. The WEKA flag indicator system can also be ordered optionally with alternative color combinations of the flags. The WEKA magnet system with the indication rail is also used to indicate the stroke positions of hydraulic or pneumatic pistons and pressure accumulator diaphragms. In addition to all of this, we offer you solutions for your special individual requirements on request.