Electromagnetic flow meter
An electromagnetic flow meter is an induction type flow instrument often used to measure the volumetric flowrate of a conductive medium based on Faraday’s Law in closed pipelines. Faraday’s Law states that the voltage induced across any conductor as it moves at right angles through a magnetic field is proportional to the velocity of that conductor.
There is one important point when using electromagnetic flow meters. Because electromagnetic flow meters are based on the laws of electromagnetic induction, conductive liquids are the only liquids for which flow can be detected. Whether it is a conductive liquid or not is determined by the presence of electrical conductivity. So, just what is electrical conductivity?
Electrical conductivity generally is a value that expresses the ease for electricity to flow. The opposite numerical value is resistivity, which expresses the level of difficulty for electricity to flow. For units, S/cm (siemens per centimeter) is primarily used. To determine how easily electricity will flow, 1 cm² electrodes are placed 1 cm apart. Using tap water at 100 to 200 μS/cm, mineral water at 500 μS/cm or more, and pure water at 0.1 μS/cm or less as samples, we can provide examples of actual measured electrical conductivity.
As per CGWA Guidelines ground water withdrawal without the installation of tamper-proof digital water flow meters and telemetry (wherever applicable) shall be construed as illegal.
Non-compliance of these conditions shall invite a Penalty provision and/or Environmental Compensation against the proponent for illegal withdrawal of ground water as per the CGWA Guidelines and may result in cancellation/rejection of NOC and sealing of ground water abstraction structures.
Installation of Digital Water Flow Meter on Ground water abstraction structures
Allegiance Water Management
www.allegianceindia.in
Keywords
NOC
Law
ease
units
level
500 μS
0.1 μS
Faraday
sealing
liquids
samples
siemens
voltage
examples
velocity
presence
conductor
tap water
telemetry
proponent
centimeter
compliance
conditions
pure water
difficulty
resistivity
electricity
right angles
installation
mineral water
100 to 200 μS
magnetic field
allegianceindia
CGWA Guidelines
1 cm² electrodes
closed pipelines
Penalty provision
conductive liquid
conductive medium
illegal withdrawal
volumetric flowrate
one important point
cancellation/rejection
opposite numerical value
electromagnetic induction
Environmental Compensation
Allegiance Water Management
electromagnetic flow meters
induction type flow instrument
ground water abstraction structures
tamper-proof digital water flow meters
actual measured electrical conductivity
CGWA Guidelines ground water withdrawal
