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Toshiba Sanitary Electromagnetic Flowmeter TIC-LF494B User Manual

Sanitary electromagnetic flowmeter, Introduction

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TIC-LF494B

Field Intelligent Device Series

Sanitary Electromagnetic Flowmeter

Introduction

Sanitary electromagnetic flowmeters LF490 series are

designed for applications handling food and beverages.

Sanitary flowmeters must be structured in such a way

that operation and handling is simple, easy and

thorough for the purpose of sanitary control such as

cleaning (CIP/SIP), sterilization and drying. The

sanitary flowmeter has features provided with normal

electromagnetic flowmeters and by using sanitary

fittings for pipeline connections fluid does not remain

in any place along the detector pipeline. Therefore, it is

fit for flowrate measurement for food and beverages.

The electromagnetic flowmeter uses Faraday’s Law of

electromagnetic induction to measure the process flow.

The device consists of two units: a detector, through

which the fluid to be measured flows and in which

low-level signals proportional to flow rates are

obtained; and a converter, which supplies excitation

current to the detector, and amplifies the signals from

the detector and then processes and converts the

signals into the 4–20mAdc current signal or

communication signal. With the unique patented

Mount-Anywhere magnetic field distribution

technology, the meter is highly immune to upstream

flow disturbances. Combined with a multi-functional

converter LF610 (combined type) or LF612 (separate

type) equipped with its patented Noise-Sentry original

noise-suppression circuit and advanced algorithms.

The LF490 has a very high tolerance to noise, giving

the unit a very stable output even for slurry fluid

measurement. IR (Infrared) switches enable parameter

setting of the converter without removing the cover.

Flow direction can be set in either way, and its unique

128 x 128 dot matrix LCD display allows the LCD to

be rotated electronically to 90, 180 and 270 degrees

without opening the cover.







Figure2. LF490 series flowmeters

The AF900 hand-held terminal (HART*

1

communicator) can be used to communicate with the

flowmeter from a remote place. PROFIBUS-PA*

2

interface is available as an option.

*1: HART protocol (Highway Addressable Remote

Transducer) is a communication protocol for industrial

sensors recommended by the HCF

(HART

Communication

Foundation).

*2: PROFIBUS is the communication protocol for factory

and process automation that the PROFIBUS

Organization recommends. Instead of analog control

with a conventional analog signal (4-20mA), it is the

fieldbus which digitizes all signals. Flowmeters support

PROFIBUS-PA.






LF494/LF610
LF494/LF612

1S to 4S (25 to 100 mm)

Certification

number

Z01207

Power supply

Converter

I/O

Detector

Power
supply

I/O

Detector

Terminal box

Signal cable

Excitation cable

Converter

LF490/LF610
LF494/LF610F

LF490
LF494

LF612
LF612F

Combined type

LF490/LF610
LF494/LF610F

Separate type

LF490/LF612
LF494/LF612F

Figure1. Configuration