PRINCIPLE

SITRANS FM Electromagnetic Flow meter detects flow by victimization Faraday's Law of induction.

Inside the SITRANS FM Electromagnetic Flow meters, there's the associate degree electromagnetic coil that generates a field of force, and electrodes that capture emf (voltage). owing to this, though it should seem as if there's nothing within the flow pipe of SITRANS FM magnetic force Flow meter, flow is measured

Under Faraday's law of induction, moving semiconducting liquids within a field of force generates associate degree emf (voltage) during which the pipe inner diameter, field of force strength, and average flow rate are all proportional. In alternative words, the flow rate of liquid acquiring a field of force is regenerate into electricity. (E is proportional to V × B × D).As the flow changes, the emf (voltage) at bay by the electrodes changes as follows.

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FEATURES OF SITRANS FM ELECTROMAGNETIC FLOW METER
Within the context of the principles listed higher than, SITRANS FM elElectromagneticlow meters typically have the subsequent options.

PROS
・Unaffected by the temperature, pressure, density,or body of the liquid.
・Able to sight liquids that embody contaminants (solids, air bubbles)
・There isn't any pressure loss.
・No moving elements (improves reliability)

CONS
・Cannot sight gases and liquids while not electrical conduction.
・A short section of straight pipe is needed

ELECTRICAL CONDUCTION
There is one necessary purpose once victimization SITRANS FM electromagnetic Flow meter as a result of SITRANS FM electromagnetic Flow meters are supported the laws of electromagnetic induction , semiconducting liquids are the sole liquids that flow is detected. whether or not it's a semiconducting liquid or not is decided by the presence of electrical conduction.So, simply what's electrical conductivity?

Electrical conduction typically could be a worth that expresses the benefit for electricity to flow. the other numerical worth is ohmic resistance, that expresses the amount of issue for electricity to flow. For units, S/cm (siemens per centimeter) is primarily used. to work out however simply electricity can flow, one cm² electrodes are placed one cm apart. victimization water at one hundred to two hundred μS/cm, drinking water at five hundred μS/cm or a lot of, and pure water at zero.1 μS/cm or less as samples, we are able to give samples of actual measured electrical conduction.

In order to calculate electrical conduction, it's necessary that conditions, like conductor space and therefore the distance between electrodes, are properly calculated. thanks to this, it's fairly troublesome to calculate. As a general thanks to make sure electrical conduction, associate degree electrical conduction meter (US$50-1000) is wont to perform this measure.

WHY WILL WATER CONDUCT ELECTRICITY?
H2O itself could be a stable molecule, and can not conduct electricity. So, why will electricity flow in water? the key is that the absence or presence of impurities within the water confirm its ability to conduct electricity.

Besides liquid (water molecules), Ca2+ (Calcium ions) and Mg2+ (Magnesium ions) exist among water. The terms H2O and H2O are determined by quantity|the quantity|the number} of ions found among a given amount of water. as a result of these ions conduct electricity among water, tap water, groundwater and alternative particle made waters possess a property that conducts electricity. Also, since pure water is merely liquid and doesn't contain any impurities, it cannot conduct electricity.

QUICK TECHNIQUE
When you would merely prefer to make sure the presence or absence of electrical conduction, a customary multi-meter is used. Place the tester in a very mode that measures resistance values and place each probes into the liquid. If the needle of the tester moves even slightly towards the zero aspect, it shows that electricity is flowing.Conversely, if the needle doesn't move from in the least, then there's no electrical conduction. It is judged that detection with SITRANS FM electromagnetic Flow meter.