Toshiba Electromagnetic Flowmeter LF470/LF612 User Manual

Introduction, Specifications, Electromagnetic flowmeter

TIC-LF470B

Field Intelligent Device Series

Electromagnetic Flowmeter

LF470/LF612

1/10",1/6”,1/4" (2.5,4,6mm )

Introduction

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

measured

flows

and

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

4–20

dc current

signal. The LF470 is a small meter size

detector designed to measure a small amount of fluids

containing substances such as chemicals.

The wetted materials for the LF470 are corrosion

resistant ceramic and platinum electrods and are

applicable to almost any kind of fluids. The LF470 is a

lightweight palm-sized detector.Combined with

multi-functional converter LF612 (separate type) and

LF232*

(separate type) equipped with its patented

Noise-Sentry original noise-suppression circuit and

advanced algorithms. The LF470 is highly resistant to

noise and provides a stable output even for fluids

containing slurries. 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 be rotated to 90, 180

and 270 degrees without opening the cover

The AF900 hand-held terminal (HART*

communicator)

can be used to communicate with the flowmeter from a

remote place. PROFIBUS-PA*

interface is available

as an option.

*1: Please refer to the document ”TIC-LF232”.

*2: HART protocol (Highway Addressable Remote

Transducer) is a communication protocol for industrial

sensors recommended by the HCF

(HART

Communication

Foundation).

*3: 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.

Figure 2. Electromagnetic Flowmeter

LF470/LF612

Specifications

Overall Specifications

Measurement range in terms of flow velocity:

0–1.0ft/s to 0–32.8ft/s (0–0.3 m/s to 0–10 m/s )

Accuracy: The overall accuracy combined with the

LF612 or LF232 converter is shown in the
following table.

Accuracy

Flow rate as a

percent of range

1.0-3.3ft/s

(0.3-1.0m/s )

3.3-32.8ft/s

(1.0-10m/s )

50 100

0.8% of FS

0.8% of rate

0 50

0.8% of FS

0.4% of FS

Note: The accuracy is measured under standard
operating conditions at Toshiba's calibration facility.

Fluid conductivity: 50µS/cm minimum

Fluid temperature:

Pipe connection material Fluid

temperature

Stainless steel and other metals

14 to 248 °F

( 10

120 )

Polyvinyl chloride
(shock-resistant)

14 to 140 °F

( 10

60 )

Ambient temperature: 14

140

°F (–10 to +60

°C

)

Structure: IP67

Power consumption:
・

When combined with the LF612 converter:

approximately 12W (20VA)
・When combined with the LF232 converter:
approximately 14W (25VA)

Fluid to be
measured

Signal cable

Excitation cable

Power supply

4-20mA dc output
and pulse output

Figure 1. Configuration Diagram

LF470

LF612

Certification number

Z01207

LF612 or LF232
Converter

LF470
Detector