Posted on 07/05/08, under Level Switching, Principles of Good Measurement, Vibration Measurement · RSS · No Comments
VEGASWING: For manifold applications in liquids
Measuring principle and applications
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, VEGASWINGs work reliably in all liquids independent of the installation position. Pressure, temperature, foam, viscosity and bubbles do not influence the switching accuracy.
VEGAVIB: Reliable switching in bulk solids
Measuring principle and applications
The vibrating rod of VEGAVIB 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.
VEGAWAVE: Robust and reliable
Measuring principle and applications
A tuning fork is used as sensor for the VEGAWAVE series. Control as well as processing correspond to VEGAVIB series.
The advantages of this series are ruggedness as well as insensitivity to buildup. Therefore, it is the ideal sensor for powders and fine-grained products. 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 flour, cement, plastic granules, sand fine gravel and styrofoam.
Posted on 06/05/08, under Level Measurement, Principles of Good Measurement · RSS · No Comments
Measuring principle - Capacitance Sensor
The proven capacitive measuring principle is one of the most common measuring principles for level measurement in the industrial measurement technology. Sensor and vessel form the two electrodes of a capacitor. A capacitance change caused by a level change is processed by the integrated electronics and converted into a switching signal. The level measurement is carried out via the complete sensor length without a dead zone. Thanks to cable and rod versions, suitable instruments are available for all applications.
Applications in liquids
Mainly fully insulated instrument versions are used in these applications. Hence measurements of corrosive liquids or adhesive products are no problem. The mounting of the instruments is easy and the rugged construction is the basis for an interference and maintenance free operation.
Applications in bulk solids
Partly insulated versions are preferably used in bulk solids. Also here, we have the proven, rugged configuration as basis for the manifold and reliable use, e.g. in the aggregates and mining industry.
Posted on 30/04/08, under Level Measurement, Principles of Good Measurement · RSS · 1 Comment
Measurement Principle of Ultrasonic Level Transmitters
Short ultrasonic impulses in to range of 10 to 70 kHz are emitted by the transducer to the measured product, reflected by the product surface and received again by the transducer. They spread with sound velocity. The time from emission to reception of the signals is proportional to the level in the vessel. The proven ECHOFOX signal processing filters out the correct level echo reliably from a number of false reflections. An adjustment with empty and full vessel is not necessary!
Application in liquids
Sensors with frequencies between 30 and 70 kHz are used for these applications. They operate independent of product properties and are ideal for water/waste water applications and the measurement of slightly corrosive acids and lyes. Also applications in gas-Ex areas can be equipped with these sensors.
Applications in bulk solids
Sensors with frequencies between 10 to 30 kHz are used for these applications. The lower switching frequency enables a considerably better penetration of dusty atmosphere. An adjustment with medium is not necessary. For applications in dust-Ex areas, approved sensors are available.
