Posted on 24/04/08, under Level Measurement, Principles of Good Measurement, Radar · RSS · 1 Comment
Measuring principle of a Radar Level Gauge
The antenna on a radar level gauge generates millions of very short 1 nano second microwave pulses every second. Each pulse is directed and transmitted to and reflected from a product surface. The elapsed time period between transmission and reception of the signal at the speed of light is measured and calculated as a distance. This continuous stream of pulses gives real time level information updated and is evaluated many times a second.
Radar level sensors work with safe, low emitted power in the C and K-band frequency range. The proven ECHOFOX signal processing selects the correct level echo reliably. Adjustment by filling and emptying the vessel is not necessary, it can normally be done with simple input of vessel dimensions.
Applications in liquids
Two different emitting frequencies are available for these applications. The compact, high frequency sensors are particularly suitable for applications for which high accuracy is required. Even with small antenna sizes, an excellent signal focusing is reached. Low frequency C-band sensors can penetrate foam and strong condensation and are thus particularly suitable for arduous process conditions. Unaffected by steam, gas composition, pressure and temperature changes the sensors detect the product surface of different products reliably.
Applications in bulk solids
High frequency sensors in K-band technology are used for these applications. Thanks to the very good focusing of the signals, the influences of silo installations or buildup on the vessel wall are gated out. A high sensitivity electronics adapted to the requirements of the bulk solids measurement, enables a reliable level measurement of different products up to 70 m. The measuring principle is unaffected by strong dust generation, filling noise, air turbulence by pneumatic filling and temperature fluctuations. The application area covers applications in the food processing industry and the plastic processing up to the steel generation.
Posted on 18/04/08, under Dataware, Hydrostatic, Information, Measurement Principles, Pressure Measurement, Principles of Good Measurement, pressure · RSS · No Comments
PRESSURE MEASUREMENT
Pressure is a really important measurement to monitor and check, as the consequences of inadequate measuring systems in place could be catastrophic, especially as so many industries have pressure related processes. Industries need pressure monitoring systems in place to make a certain pressure has been met, that is pressure is constant, or to ensure pressure is not exceeded. Through reliable pressure instrumentation, accurate and automated information will ensure safety, productivity, quality, economy and efficiency in modern day manufacturing.
An example of where pressure measurement is carried out is when a diaphragm is deflected by a product, like gas. This deflection is tiny, so an accurate consistent measurement of this movement is essential, especially when the gas (or other product) will expand or contract with minor temperature variations, therefore having a significant influence.
We have established the importance of reliable level pressure instruments - the selection of the correct type of sensor is just as important, as aspects like use of chemicals, physical features, temperatures, pressure shocks and pulses must also be taken into consideration. The following VEGA ranges embrace the pressure measuring principle:
Hydrostatic - VEGABAR/WELL Range
Process Pressure - VEGABAR Range
Differential Pressure - VEGADIF Range
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