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Introduction

La configuration du transmetteur de niveau peut prendre beaucoup de temps. Les calculs requis pour déterminer les valeurs de plage correctes pour les transmetteurs traditionnels peuvent devenir complexes en raison de la disposition physique d'une application.

Les ateliers de maintenance étant de plus en plus petits, il est prioritaire de trouver du matériel nous permettant de faire plus avec les fens. Les transmetteurs DPharp dotés de fonctionnalités logicielles avancées peuvent éliminer ces calculs complexes.

Application

En utilisant des produits classiques ou intelligents, vous devez tenir compte de tous les éléments suivants:

La densité du process SGP

L’emplacement précis du 0% et 100%

La densité du liquide de remplissage du capillaire
   (ou liquide tampon utilisé dans la ligne d'impulsion)

SGFF
L’Orientation exacte du transmetteur par rapport à la cuve H2
L’écart de distance entre les piquages process H1

En fonction de l'application, la cuve peut être ouverte (atmosphère de référence) ou fermée (sous une pression généralisée).

L’élévation est généralement utilisée lorsque la cuve est fermée. Pour faire référence à la pression de cuve, un séparateur distant côté basse pression peut être utilisé (ou une colonne remplie). Le capillaire sur le séparateur distant crée sur le transmetteur une force négative égale à la hauteur verticale multipliée par la densité du liquide de remplissage.

Élévation = (H1 + H2) x SGFF

La suppression est une pression positive créée sur le côté haute pression du transmetteur, généralement du fait que le transmetteur est positionné sous le raccordement process 0%. La suppression est présente dans les deux types de cuve ouverte et fermée. La suppression est égale à la distance verticale entre la connexion de processus à 0% et le transmetteur multiplié par la densité du liquide de remplissage.

La suppression = H2 x SGFF

L’échelle est la distance verticale entre les 2 piquages process multiplié par la densité du liquide process.

Échelle = H1 x SGP

Figure 1: Closed Tank
Figure 1: Cuve fermée

Maintenant que vous avez ces 3 paramètres, la calibration peut être calculée pour le 0% (vide) et le 100% (plein).

Valeur de calibration (0%) = Suppression - Élévation

Valeur de calibration (100%) = (suppression + échelle) - Élévation

Example: (using figure 1)

SGP 0.9 H2 1m
SGFF 0.8 H1 2m

Valeur à 0% = Suppression - Élévation
Valeur à (0%) = (H2 x SGFF) - (H1 + H2 x SGFF)
Valeur à (0%) = (1 x 0.8) - (2 + 1) x 0.8
Valeur à (0%) = 8 - 2,4
Valeur à 0%) = -1,6 inH2O

Valeur à (100%) = (Suppression + Échelle) - Élévation
Valeur à (100%) = ((H2 x SGFF) + (H1 x SGP)) - (H1 + H2) x SGFF
Valeur à (100%) = ((10 x 0.8) + (20 x 0.9)) - (20 + 10) x 0.8
Valeur à (100%) = (8 + 18) - 24
Valeur à (100%) = +2 inH2O

Par conséquent, la plage étalonnée serait:

-1,6 inH2O  +0,2 inH2O
0% 100%
Vide Plein

Industries

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  • Chimie fine et de spéciclité

    Yokogawa has long served customers in the specialty and fine chemicals market. With a market leading batch solution that offers the best in class reliability and flexibility as well as industry experts who understand the complex requirements in designing a batch solution, you can be assured that in your partnership with Yokogawa you will have a system that will enable you to produce products that meet your customers’ needs in the future while maintaining safety and regulatory compliance.

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  • Eau et traitement des eaux usées

    Yokogawa has been providing control solutions for sustainable water production by developing more energy-efficient technology, helping to reduce the carbon footprint of operations, and building rock-solid products that protect the environment from contaminants. With our leading-edge technology and extensive application know-how, we work with you to provide sustainable water solutions that boost your business and add high value throughout the plant lifecycle. Our technology and products improve the performance of plants and ensure that they can operate competitively in today's water markets, and also reduce their running costs. Yokogawa supports a wide range of water control applications in both the municipal and industrial water markets.

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  • Eaux industrielles

    Industrial water is used in all industrial plants such as power generation stations, refineries and petrochemical plants. Yokogawa’s single control platform handles all water and wastewater control processing integrated with the main process.

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    Yokogawa has operated the global power solutions network to play a more active role in the dynamic global power market. This has allowed closer teamwork within Yokogawa, bringing together our global resources and industry know-how. Yokogawa's power industry experts work together to bring each customer the solution that best suits their sophisticated requirements.

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  • Exploration et Gaz

    The upstream industry includes offshore and onshore activities including wellhead automation, fractionation, completion, and separation to recover and prepare underground or underwater crude oil and natural gas.

    As petroleum is brought to the surface, it must be separated prior to transport. Primary and secondary separation stages commonly distribute gas flow, water flow, and oil flow in three phase separation. Gas movement requires pipeline and can include a fractionation process in the upstream stage prior to movement. Liquids can be placed into a tanks or pipelines and sent for processing, requiring accurate level measurements.

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    Petrochemical companies’ needs are extremely diverse. To come out ahead in today’s highly competitive marketplace, producers are striving to improve quality and productivity. Yokogawa provides tailor-made solutions for these needs based on its long and wide-ranging experience in this field.

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  • Pétrole et Gaz (exploration et production)

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  • Pétrole et Gaz (raffinage et distribution)

    The oil & gas downstream industry has been facing an increasing number of challenges in recent years. These include the changing characteristics of the feedstock to be processed, aging of process facilities and equipment, rising cost of energy, lack of skilled plant operators who can run a refinery safely and efficiently, and the ever-changing requirements from both the market and the customer.

    Over the years, Yokogawa has partnered with many downstream companies to provide industrial solutions focused on solving these challenges and problems. Yokogawa's VigilantPlant solutions have helped plant owners to achieve maximum profitability and sustainable safety within their plants.

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  • Raffinage

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  • Traitement de eaux usées

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  • Traitement des eaux

    Yokogawa provides optimum solutions to improve the reliable operation of water treatment plants. These solutions include sophisticated technologies, unsurpassed product quality, and extensive application know-how throughout the lifecycle.

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