Overview - Toshiba LF620 Instruction Manual

2. Overview

This product is a converter used for electric flowmeters that measure the volumetric flow rate of
conductive fluid using Faraday's law of electromagnetic induction.
You can bring out the functions of the converter when you place it in the converter housing you
prepare and use it in combination with a fluid rate measurement detector.
The converter sends out a signal to drive the detector exciting coil, which generates a magnetic field inside
the detector. The converter receives the signal electromotive force obtained by the detector, as signal
electromotive force in proportion to the generated flow rate in the fluid using Faraday's law of
electromagnetic induction. After carrying out operation, the converter converts the signal electromotive
force to an analog signal instrumentation unified signal output and displays the status, as a flow rate value.
Features
With a linear relationship between the flow rate and output signal, the electromagnetic flowmeter is
featured as an easy-to-read indicator. In addition to this feature, it has the following outstanding features:
(1) Wide flow velocity range setting, such as a flow velocity range of 0~0.1 and 0~10m/s, is achieved.
(2) The unique noise filter-out circuit and arithmetic operation processor enables you to obtain a
stable output.
(3) Full graphic electronically rotatable LCD that enables display of a large amount of information
• With a large amount of a maximum of 9 characters x 7 lines, you can easily check various
displays including bar graphs and alarm indications.
• The backlight allows you to read the indicator easily.
(4) Use of infrared switches
• Use of infrared switches allows you to perform various operations, without opening the converter
housing cover.
(5) Intelligent functions
• The widely used HART protocol
• This product supports PROFIBUS
• This product supports Modbus
* 1 HART protocol:
* 2 PROFIBUS:
*3 Modbus
*1
communications system is used as a standard feature.
*2
communication by option.
*3
communication by option.
"HART" stands for Highway Addressable Remote Transducer and is a communication protocol
recommended by HCF (HART communication Foundation) for industrial sensors.
PROFIBUS, which stands for PROCESS FIELDBUS, is a kind of field bus that is approved by
nternational standard IEC61158. The electromagnetic flowmeter supports PRFIBUS PA for process
automation.
Modbus Protocol is the communication protocol that Modicon Inc. (AEG Schneider Automation
International S.A.S.) developed for PLC
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