Posted on 17/04/08, under Capacitive, Dataware, Guided Microwave TDR, Information, Level Interface, Nucleonics, Principles of Good Measurement, Vibration Measurement Solid Switches · RSS · No Comments
LEVEL INTERFACE
Level interface is caused by the separation of two liquids, the most common being oil and water. The interface is caused by one of the liquids not being able to mix with the other, possibly because it is a different weight – oil is lighter than water, does not mix well and floats on top of the water Level Interface doesn’t just occur with liquids, because sometimes liquid needs to be separated from solid matter in some processes too. Interface measurement instruments are used to control the separation of these two products (whether liquids or liquid and solid), and are often the solution used in processing and effluent control.
The ways in which the interface can be detected are by measuring weight, electrical pulses, and working out the differentials of the products (e.g. oil is lighter, floats and is non-conductive). VEGA has a range of instruments that detect these differences, either as a switch point, or a continuous measurement of the interface between two liquids, or a solid and liquid. These ranges are listed below:
Guided Microwave - VEGAFLEX Range
Capacitive - VEGACAP Range
Nucleonic - VEGA OHMART Range
Vibration Solids - VEGAVIB Range
Digital Communications – DATAWARE
Posted on 16/04/08, under Dataware, Density, Hydrostatic, Information, Nucleonics, Principles of Good Measurement · RSS · No Comments
DENSITY
If there are changing weights, for a fixed volume, then density measurement is what you need. This will depend on the industry, application and product requirements, for example if you need to reduce the water content to increase concentration, or add heavier solids to the liquid to produce slurry, then this will change the density of the product you want to measure.
Instruments that measure density work by either measuring the weight of an known quantity, or by how the signal conveys the weight – the less of a signal, the more dense, or the more of a signal would be less dense. Obviously, you would need to understand this signal, and automate the process, so you don’t have to sit there and watch it 24/7. These measurements will often ensure the quality of your product.
This measurement principle is widely used for detecting changes in switching and measuring density itself. VEGA have a range of instruments, with different techniques, that detect the differences in density either at a switch point, or as a continuous measurement. These instruments are listed below:
Hydrostatic - VEGABAR/WELL Range
Nucleonic - VEGA OHMART Range
Digital Communications – DATAWARE
Posted on 15/04/08, under Capacitive, Conductive, Dataware, Information, Level Switching, Nucleonics, Principles of Good Measurement, Vibration Measurement Liquid Switches, Vibration Measurement Solid Switches · RSS · No Comments
LEVEL SWITCHING
Another important control to have in place, for every industry, is the knowledge of when to start and when to stop a process. If you are emptying, filling, controlling or protecting processes, then you need a reliable and secure level switching solution.
Obviously having these switching systems in place is paramount, as any failures, or unnoticed failures, in the aforementioned processes (emptying, filling, controlling and protecting) will cost valuable money and even in some cases affect the environment.
It is very important for the correct level switching instrument to be chosen, as there will be a few factors that will influence what switching system you require, like whether there are chemicals involved in the process, or whether it’s a liquids or solids application. Once again, other considerations in your choice of level switch instrument will include whether there are high pressures, temperatures, build up, foam, dust, vapours, or stirrers.
VEGA Instruments that fulfil the measuring principle of level switching:
Capacitive - VEGACAP Range
Nucleonic - VEGA OHMART Range
Vibration Solids - VEGAVIB Range
Vibration Liquids - VEGASWING Range
Conductive – VEGA Conductivity Range
Digital Communications – DATAWARE
