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In all industries, knowing when to stop or start any process is crucial. If you are filling, emptying, protecting or controlling processes, for every business the security and reliability of these systems is paramount.
Unnoticed failure of switching systems and their ability to detect can cost money...even threaten the environment or worse! Selection of switches is an important step in the planning of a level control. To ensure the reliability of any solution, the chemical and physical features, high temperatures, pressures, build up, vapours, foam generation, dust, static charge, stirrers etc., must always be considered.
Now let's take a look at the Measuring Principles of vibrating instruments used for Level switching.
Measuring principle of Vibrating Level Switch for Liquids
The piezo drive is the heart of the sensor, activating the tuning fork to vibrate on its resonance frequency. The frequency of the fork reduces with the immersion. The frequency change is evaluated by the integrated electronics and converted into a switching signal. An optimized screwed connection is used to ensure reliability and ruggedness of the piezo drive. With the tuning fork of only 40 mm length, the vibrating level switch for liquids work reliably in all liquids independent of the installation position. Pressure, temperature, foam, viscosity and bubbles do not influence the switching accuracy.
Measuring principle of Vibrating Level Switch for Solids
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The vibrating rod of vibrating level switch for solids is activated to vibrate via the piezo drive. If the vibrating rod is immersed, the amplitude will be damped. The electronics detects this damping and converts it into a switching command.
Due to the rod design, it is almost impossible for material to build up or get wedged in. The easy cleanability offers the requirements for use in the food processing and pharmaceutical industry. The installation position and granulation size do not influence the reliability. Mounting and setup are very easy, an adjustment with medium is not necessary. Typical applications are overfill and dry run protection systems in products such as plastic granules, styrofoam, milk powder and pellets.
There are more robust and reliable tuning forks, which work in much the same way as the above, but are more rugged and have an insensitivity to build up, making it the ideal type of sensor for powders and fine-grained products. Typical applications for these more robust level switches are overfill and dry run protection systems in products such as flour, cement, plastic granules, sand fine gravel and styrofoam.
How Can I Find Out More?
Easy, just contact VEGA! An experienced area engineer is your dedicated point of contact, backed by a focussed customer service team. We can give you prices delivery and advice fast over the phone; send you information, application data and references. Most of all, we'd like to discuss your application, to ensure the right solution, first time, to suit your process, budget and installation needs. http://www.vegacontrols.co.uk