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 pdf fileMeasurement 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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 pdf fileRADAR 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

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 pdf fileULTRASONIC 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.

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 pdf fileSIEMENS 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..

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 pdf fileVarious 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

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Last download: Sat Apr 08, 2017 05:28:07 AM


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 pdf filePRESSURE 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.

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