artículo principal
tecnología > instrumentación > nivel > capacidad
This article is not yet available in the language you selected

Capacative Measuring Technology

Some items are not yet translated in English.
Capacative Measuring Technology
Every electrically charged material is surrounded by an electric field.

Electric field lines from positive to negative are formed between materials with different charges.
Two differently charged metal plates isolated from one another form a condenser.


Some items are not yet translated in English.
Principles of the Condenser
The principle of capacitive level measurement is based on the change in the capacity of a condenser caused by a change in the level. The capacity of a condenser is determined by means of 3 factors:
Gap between electrode surfaces (d)
Size of electrode surfaces (A)
Dielectric between the electrodes (eI)
Electric field constant
8.854*10-12 C/(Vm)
Dielectric constant (medium)


Some items are not yet translated in English.
Dielectric Constants
Dolomite
Iron oxide
Grain
Broken glass
Coffee
Lime hydrate
Lime powder
Coal, raw
Powdered coal
Fodder concentrate
Flour
Nylon granulate
Quartz powder
Rice
Sand, dry
Washing powder
Air = 1
Alcohol
Petrol
Chloroform
Desmophen 5100
Desmodur 44 V
Deuterium
Liquid gases
- Chlorine
- Air -140°C
- Butane
- Propane
Glycerine
Heating oil
Latex
Petroleum
Water


Some items are not yet translated in English.
Electric Conductivity
Non-conductive media
(hydrocarbons, solvents, petrols, oils)
Low-conductive media
(hydrocarbons with a higher water content, demineralised water)
The DK of the medium must not change through moisture, for example. Otherwise, the level can no longer be reliably measured.
The measuring flow not only depends on the DK, but also on the conductivity of the medium.
Conductive media
(aqueous solutions of salts, acids, alkalis, electrolytes, food, beverages)
A change in the DK and conductivity does not have any effect on capacity since the medium produces a short circuit with the container wall.


Para más información: Endress+Hauser GmbH

forumReply to this article
All fields are required. Your personal information will not be displayed on our website. Hyfoma does not supply machines, but only refers to the companies that do. Most of the suppliers listed supply machines for the food industry, and do not produce food themselves.

Name: Email:
Función: Compañía:
Send this reply to:

Magnetrol International
As a world leading, global supplier, of high quality level and flow...