Toshiba TIC-LF494B manual Introduction, Combined type Separate type

Field Intelligent Device Series

LF494/LF610

Sanitary Electromagnetic Flowmeter LF494/LF612

1S to 4S (25 to 100 mm)

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-Anywheremagnetic 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-Sentryoriginal 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.

Converter

	Converter	Signal cable	Power
I/O			supply
		Terminal box

LF490/LF610 LF490 LF612

LF494/LF610F LF494 LF612F

Figure2. LF490 series flowmeters

Certification

number

Z01207

The AF900 hand-held terminal (HART*1 communicator) can be used to communicate with the flowmeter from a remote place. PROFIBUS-PA*2interface 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.

Power supply	I/O
	Excitation cable
Detector	Detector
Combined type	Separate type
LF490/LF610	LF490/LF612
LF494/LF610F	LF494/LF612F

Figure1. Configuration

TIC-LF494B