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Measurement of Level, Humidity and pH
objectives: Name different methods for level and moisture measurements; Explain the basic techniques of level and humidity measurement; Explain the principle of pH measurement; Explain the necessity of using special measuring circuit for pH measurement;
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Last download: Mon May 07, 2012 02:41:00 AM
183
timesRADAR LEVEL MEASUREMENT BASICS
Radar level measurement is based on the principle of measuring the time required for the microwave
pulse and its reflected echo to make a complete return trip between the non-contacting transducer and the
sensed material level. Then, the transceiver converts this signal electrically into distance/level and
presents it as an analogue and/or digital signal. The transducer’s output can be selected by the user to be
directly or inversely proportional to the span.
RADAR LEVEL MEASUREMENT BASICS
File size: 118.88 KB
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Last download: Mon May 07, 2012 01:50:55 AM
301
timesULTRASONIC LEVEL MEASUREMENT BASICS
ULTRASONIC LEVEL MEASUREMENT BASICS
Ultrasonic level instruments operate on the basic principle of using sound waves to determine liquid/
solid/slurries level. In addition to standard level or volume measurement, they can monitor open channel
flow, determine the actual volumetric throughput in lift stations, measure differential level and control the
pumps.
File size: 1 MB
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Last download: Mon May 07, 2012 02:39:16 AM
164
timesSIEMENS Level measurement guide
This guide provides an overview of level measurement instruments to help you select the equipment and solution that best meet your needs.SIEMENS..
File size: 2.66 MB
File type: pdf
Last download: Mon May 07, 2012 10:01:25 AM
136
timesVarious Technics of Liquids and Solids Level Measurements
wide variety of physical principles can be applied for measurements of liquids, solids and slurries levels
such as: pressure, level-sight, radiation, sonic principles, electrical properties, etc.
A series of questions must be answered in order to determine the kind of level sensor which should be
utilized for an application
File size: 236.59 KB
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Last download: Mon May 07, 2012 10:05:10 AM
147
timesPRESSURE TYPE INSTRUMENTS
Pressure is exerted force per unit area. The pressure at a given depth, in a static liquid, is a result of the
weight of the liquid acting on a unit area at that depth plus any pressure acting on the surface of the liquid.
Level measurement based on pressure measurement is also referred to as hydrostatic tank gauging.
Pressure is not really a vector even though it looks like it in the sketches. The arrows indicate the direction
of the force that the pressure would exert on a surface that it is contact with. Moreover, the pressure at a
given depth does not depend upon the shape of the vessel containing the liquid or the amount of liquid in
the vessel; only the variations of the height of the liquid column in an open tank for a specific liquid at a
certain temperature will determine the force at the bottom of the tank.
File size: 96.76 KB
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Last download: Mon May 07, 2012 10:08:05 AM
