Toshiba LF470 - Manual (Page 10)

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2. Overview
The LF470 electromagnetic flowmeter measures the volumetric flow rates of electrically
conductive materials on the basis of Faraday's Law of electromagnetic induction.
The device consists of two units: the LF470 detector, through which the fluid to be measured
flows, and the converter, which receives the electromotive force signals from the detector,
then converts the signals into the 4—20 mA dc signal.
Features
Every type of electromagnetic flowmeter has the following features:
■ Fluid flow is not obstructed and pressure loss is negligible.
■ The process fluid's temperature, pressure, density or flow conditions has no effect on the
accuracy of the flowmeter.
■ The flowmeter output is directly proportional to the process flow rate, thus it is easy to
read its output.
The LF470 electromagnetic flowmeter detector has the following additional features:
(1)
High
accuracy,
±0.8% of rate
is possible for 1.0-10 m/s velocity range.
±0.8% FS is possible for 0.3-1.0 m/s velocity range.
(2) The flowmeter can be used to measure any fluids included acid and alkaline fluids,
for the reasons stated below:
• Ceramic is used for the detector pipe.
• Platinum is used for the electrode.
(3) The flowmeter is very small and light. Because of it, the flowmeter can be mount­
ed on panel.
(4) It is possible to coimect to various pipes or tubes by using joints available in the
market.
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