Posted on 12/06/08, under Principles of Good Measurement, pressure · RSS · 1 Comment
Why are Pressure Sensor MEMS important?
Over the last two decades, the pressure sensor MEMS (MicroElectroMechanical Systems) industry has made continuous improvements. This continuous improvement is borne from the demanding requirements of tens of thousands of hydrostatic pressure based, level installations. In these applications, linearity and accuracy have to perform throughout the measuring range and a sensors’ performance is constantly monitored against content and level readings. These pressure controls also have a range of approvals and designs for chemical, marine, food and pharmaceuticals available.
How do Pressure Controls Work?
The pressure measuring cell is the heart of the pressure transmitter converting the pressure into an electrical signal. This pressure dependent signal is converted by the integrated electronics into a standardized output signal. Different sensors are used for pressure measurement. The ceramic cells have the advantages of excellent long term stability with high overload resistance. The metal cells cover higher measuring ranges and use stainless steel as diaphragm material.
Where can I use Pressure Sensor MEMS?
You can use Pressure Sensor MEMS in almost all pressure and vacuum applications. They can mount in any orientation with a wide range of process fittings to get connected to your process. High temperature, high resistance, gauge and absolute transmitters are available, across all ranges complimented with special ranges of (chemical) seals, fittings and materials.
Posted on 23/05/08, under Level Switching, Principles of Good Measurement · RSS · No Comments
VEGAKON: Conductance Level Switches
Measuring principle and applications
The instruments work according to the conductive measuring principle and are used in conductive liquids. The probe detects the product resistance when being immersed. A low alternating current flows which is detected by the integrated electronics and converted into a respective switching signal. The switching signal is determined via the mounting position or the length of the respective probe. The easy and robust construction of the sensors offers a maintenance free and reliable level detection in all areas of industrial measurement technique. Typical applications are e.g. overfill protection, pump control or dry run protection.
Conductance level probes EL: Flexible determination of the switching point
Measuring principle and application
The instruments are used for level detection in conductive liquids. When the electrode is immersed, the product resistance is evaluated through the connected VEGATOR signal conditioning instrument. A low alternating current flows which is detected by VEGATOR and converted into a respective switching signal. The switching signal is determined via the mounting position or the length of the respective probe. The easy and robust construction of the sensors offers a maintenance free and reliable level detection in all areas of industrial measurement technique. Typical applications are e.g. overfill protection, pump control or dry run protection.
Posted on 07/05/08, under Level Switching, Principles of Good Measurement, Vibration Measurement Solid Switches · 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.
