ELECTROMAGNETIC FLOWMETER    

The Toshiba LF410 electromagnetic flowmeter accurately measures the flow of almost any conducting liquids including foods, pharmaceuticals, pulps and slurries with suspended solids.


Cost effective
Wide range
High accuracy
No obstruction to flow
Highly resistant ceramic lining
Easy to set up
Good stability and noise suppression

Application
Electromagnetic flowmeters are ideally suited for most conducting liquids including aggressive, abrasive and corrosive liquids and those containing solids. The bore of the flowmeter is smooth with no obstruction to flow hence the pressure drop is low. The measurement is independent of pressure, temperature, density, conductivity (above certain limits) and viscosity. Typical applications are for the measurement of chemicals, pharmaceuticals, pulp, foods, acids, alkalis, dyes, waste water and liquids containing solid matter.

Principle of Operation
The flowmeter consists of two parts: a detector which is mounted in the pipeline and through which the measured liquid flows, and a converter which may be mounted either integral with the detector or separately. The converter conditions and outputs the electrical signal from the detector. The measuring principle is based on Faradays Law of Electromagnetic Induction which states that if an electrical conductor, in this case the measured liquid, passes through a magnetic field a small electromotive force (EMF) is induced perpendicular to the field and flow. This EMF is proportional to the average flow velocity and is detected by two electrodes mounted in the wall of the detector and then fed to the converter. The divided multi sampling and noise suppression provides superior accuracy and stability. Presence of deposits on the electrodes have no effect on the zero point as long as some part of the electrode is exposed. The coil arrangement of the flowmeter is such that uneven flow can be measured correctly. The functional magnetic field distribution technique and the reduced number of components result in improved flow measurement efficiency and reliability.

Construction
The stainless steel construction is durable and gives excellent corrosion resistance. The rotor is machined from solid making it virtually indestructible. The sleeve bearings provide you with highly reliable performance over long periods.

Calibration
The flowmeter can be set to any flow range between the minimum and maximum flow ranges in the following table. A test certificate is issued for each flowmeter and the amplifier output is set to customer requirements.

Installation
The flowmeter can be mounted in any plane but should be maintained full of liquid at all times. For vertical installations flow should be upwards and in all cases the electrodes should be horizontal. This flowmeter has a short inlet-to-outlet length and should be installed with between five and ten pipe diameters upstream. No downstream diameters are required. The LF410/LF400 is a combined detector and converter. The LF410 can be mounted separate to the LF420 converter for remote mounting.

 Flow Ranges

 Detector Specification

 Converter Specification

Intrinsically Safe Version
The flowmeter can be mounted in the hazardous area.It is approved to FM Class 1 Division 1

 Power Supply

 Materials of Construction

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