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Medicao Hidrostatica de Nivel 7

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  Liquid level measurement    P   R    4   0   0   2   3   E   N  JUMO – your partner for liquid level measurement 2 Your contact partner:Dipl.-Wirtsch.-Ing. Sarah Weinmeister Product managerPressure measurementtechnologyTel.: +49 661 6003-715e-Mail:druckmesstechnik@jumo.net Tradition meets unlimited possibilities With an increasingly dynamic market, progressing globalizationand the associated competitive and cost pressure, completeuniform solution concepts with synergistic effects are becomingincreasingly important. To meet our customers' needs and respond to their innovativetasks, JUMO offers a complete portfolio covering every stepof the measurement chain. In addition to a wide range of sensors for recording various measurement variables such aspressure, temperature, and pH, we also offer a large selec-tion of transmitters and display, evaluation and control instruments. Comprehensive customer service rounds out ourrange of services. JUMO also offers complete uniform solution concepts forpressure and liquid level measuring instruments. Sophisticated technologies have been setting standards inpressure and hydrostatic liquid level measuring technologyfor more than 30 years. The knowledge and experience of morethan 1650 employees. JUMO has the production flexibilitythanks to our great manufacturing depth. We expect the highest standards of quality, implemented with our own sensor manufacturing and modern production lines. To consolidate and expand our quality standards, measuringinstruments are subject to extensive tests in our own test lab. Hydrostatic pressure as described in this brochure can bemeasured with conventional level probes featuring a designwith numerous options developed for relevant applications. Precise technical descriptions of our measuring instrumentscan be found on the Internet under the specified type numberat www.jumo.net.  Contents Photo credits: Fotostudio Merz-Tricot, Steinau an der StraßeDauf/fotoliaStephen VanHorn/fotoliaEric Gevaert/fotolia zanfr/fotoliaAlhazm Salemi/fotolia Torsten Rauhut/fotoliaHarald Soehngen/fotoliaAndrey Armyagov/fotolia Tyler Olson/fotolia Spectral-Design/fotolia fotoflash/fotolia RainerSturm/pixelio 3 “… because the whole is more than the sum of the parts.” (Aristoteles) Chapter I: The first chapter covers the basic principles of hydrostatic liquid level measurements. The principle of the relevant measurement technology is also discussed. Chapter II: The second chapter provides an overview of technical featuresas well as information about applications. This is useful whenselecting the right product for an application. Chapter III: The third chapter rounds out the complete uniform productrange of liquid level measurement with accessories and sup-plementary products. General information  ........................................................... 4– General operating conditions– Hydrostatic liquid level measurement– Piezoresistive silicon sensor – Capacitive ceramic sensor Overview of level probe products  ..................................... 5 Information about selecting products ........................ 6 + 7– Information about selecting the measurement range– Effect of density on the liquid level– Process connection– Cables Evaluation information ..................................................... 8 Application: Run-of-the-river hydroelectric power plant ..................... 9 Accessories ........................................................................ 10 – Terminal box with pressure compensation element– Screw plug– Cable clamp assembly– Hose endpiece Application: Heating oil tank ............................................. 11 – Product selection– Liquid level visualization and measured value documentation with consideration of the tank geometry  General operating conditions Level probes are used for hydrostatic liquid level measu-rement of ventilated tanks or to determine level in openwaters. If the liquid level measurement includes superim-posed pressure measurement in closed tanks this can beimplemented with differential pressure transmitters suchas the JUMO dTRANS p20 DELTA (type 403022) or JUMOMIDAS DP 10 (type 401050). If the measurement is performed externally, for examplefor hygienic reasons, the JUMO dTRANS p30 (type 404366)or the JUMO dTRANS p20 (type 403025) can be used. Hydrostatic liquid level measurement Hydrostatic pressure in a liquid is produced by the force ofthe weight of the column of liquid above an immersed object (unit of measure: meters of water column). Pressure increases as the depth increases regardless ofdirection. A column of water 10meters in depth (mWC)corresponds to 0.98bar (approximately 1bar).The hydrostatic pressure is derived from the conditions of equilibrium of forces with the weight. It is calculatedbased on the ambient pressure, the density of the liquidand liquid level. Piezoresistive silicon sensor Once the level probe reaches the immersion depth, the hydrostatic pressure acts on its stainless steel separatingdiaphragm. This pressure is transferred via filling oil to thesensor with a resistance measuring bridge. The modifiedmobility of electrons in the silicon crystal structure of thesensor results in a measurable change in resistance (pie-zoresistive effect). Specially adapted compensation and amplifier electronicsconverts this delta into electrical output signals, which inturn provide a direct measure of the level when the densityof the liquid is known.Small dimensional parts and parts in contact with mediummade of stainless steel ensure suitability for numerous applications. Capacitive ceramic sensor In electrical terms, the ceramic-capacitive pressure mea-surement represents a plate capacitor with two highly re-sistant ceramic plates (AL 2 O 3 ) that are isolated from eachother. The change in capacitance is a measure of thechange in pressure and thereby of the level. Using AL 2 O 3 makes it possible to achieve a highly precise measurementthrough linear deflection. Capacitive ceramic sensors are used when there are highrequirements for corrosion resistance or when separatingdiaphragms are exposed to high mechanical loads. Theycan provide almost 80 times the overload protection. General information 4 ph  ρ JUMO MAERA S28 Level probeType 404392 Ambient pressure: p 0 = 0 for relative pressure measurementDensity of the liquid: ρ Level: h Cable clamp assembly Article No. 00061389 Gravitational acceleration: g = 9,81m/s 2 This formula applies to liquids at rest in containers or open water. Calculation: Hydrostatic pressurep = p 0 +  ρ x g x h p 0

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Jul 23, 2017
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