Toshiba LF232*F Instruction Manual

 

 

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 

 

Specifications 
■ 

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. 

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) 

The accuracy is measured under standard 

operating

 

conditions

 

at

 

Toshiba's

 

calibration

 

facility.