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Toshiba LF502 User Manual

Introduction, Specifications, 6” to 24

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TIC-LF502A

Introduction

The LF502 electromagnetic flowmeter uses Faraday’s

Law of electromagnetic induction in the same way as

conventional electromagnetic flowmeters to measure

the flow rate. Position of electrodes in the LF502 is so

designed that it can be used even in a partially-filled

pipe to measure the flow rate.

Improved functional magnetic field distribution

technique enables a high-precision flow measurement

continually from low-level to fully-filled flow

conditions. This

eliminates

unnecessary

piping

work

such

as

lifting the downstream pipe section to fill the

detector pipe.

Compared with flowmeters measuring the flow rate by

means of flow level, the obstruction less LF502

flowmeter does not usually allow mud, sands and other

solid sediment stay at the bottom of the detector pipe

and

is

unaffected

by

wave

or

floating

solids

on

the

fluid

surface.

The AF900 hand-held terminal (HART*

1

communicator) can be used to communicate with the

flowmeter from a remote place.

*1: HART protocol (Highway Addressable Remote

Transducer) is a communication protocol for industrial

sensors recommended by the HCF

(HART

Communication

Foundation).

Detector

Signal cable

Converter

Excitation cable

Digital I/O

Power supply

4-20 mAdc

Figure 1. LF502/LF232*F Configuration

Figure 2. LF502 Electromagnetic Flowmeter

for Partially-filled Pipes

Specifications

Overall Specifications

Measurement range:

Meter size

Measurement range

6” (150mm)

0 – 264 GPM(std) to 0 – 1320 GPM

(0 – 60 m

3

/h to 0 – 300 m

3

/h )

8” (200mm )

0 – 484 GPM(std) to 0 – 2420 GPM

(0 – 110 m

3

/h to 0 – 550 m

3

/h )

10” (250mm )

0 – 770 GPM(std) to 0 – 3850 GPM

(0 – 175 m

3

/h to 0 – 875 m

3

/h )

12” (300mm )

0 – 1100 GPM(std) to 0 – 5500 GPM

(0 – 250 m

3

/h to 0 – 1250 m

3

/h )

14” (350mm )

0 – 1540 GPM(std) to 0 – 7700 GPM

(0 – 350 m

3

/h to 0 – 1750 m

3

/h )

16” (400mm )

0 – 1980 GPM(std) to 0 – 9900 GPM

(0 – 450 m

3

/h to 0 – 2250 m

3

/h )

20” (500mm )

0 – 3124 GPM(std) to 0 – 15620 GPM

(0 – 710 m

3

/h to 0 – 3550 m

3

/h )

24” (600mm )

0 – 4400 GPM(std) to 0 – 22000 GPM

(0 – 1000 m

3

/h to 0 – 5000 m

3

/h )

Note: Above flow rate is almost 0 – 3.28 ft/s (std) to 0 –

16.4 ft/s (0 – 1 m/s to 0 – 5 m/s ) flow velocity.

Fluid-level range:

Meter size

Specification

6” to 12” m

(150 to 300m )

1-1/4”(30mm ) to fully-filled condition.

14” to 24”

(350 to 600mm )

10% of inside tube diameter to
fully-filled condition.

Note: The fully-filled condition means a 100% of inside

tube diameter.

Accuracy: ±2% FS (when measurement range is

standard)

Note:

The accuracy is measured under standard

operating

conditions

at

Toshiba's

calibration

facility.

Electromagnetic Flowmeter for
Partially-filled Pipes

LF502/LF232*F

6” to 24”

(

150

to

600

mm

)

LF502

LF232*F

This manual is related to the following products: