Toshiba LF232*F Series Instruction Manual

Electromagnetic Flowmeter for
Partially-filled Pipes
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*
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).
Signal cable
Detector
Excitation cable
Figure 1. LF502/LF232*F Configuration
1
Converter
Power supply
4-20 mAdc
Digital I/O
LF502/LF232*F
LF502
Figure 2. LF502 Electromagnetic Flowmeter
for Partially-filled Pipes

Specifications

■
Overall Specifications
Measurement range:
Meter size
0 – 264 GPM(std) to 0 – 1320 GPM
6" (150mm)
0 – 484 GPM(std) to 0 – 2420 GPM
8" (200mm )
0 – 770 GPM(std) to 0 – 3850 GPM
10" (250mm )
0 – 1100 GPM(std) to 0 – 5500 GPM
12" (300mm )
0 – 1540 GPM(std) to 0 – 7700 GPM
14" (350mm )
0 – 1980 GPM(std) to 0 – 9900 GPM
16" (400mm )
0 – 3124 GPM(std) to 0 – 15620 GPM
20" (500mm )
0 – 4400 GPM(std) to 0 – 22000 GPM
24" (600mm )
(0 – 1000 m
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
6" to 12" m
1-1/4"(30mm ) to fully-filled condition.
(150 to 300m )
14" to 24" 10% of inside tube diameter to
(350 to 600mm ) 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.
6" to 24"
150 600
( to
mm
LF232*F
Measurement range
3 3
(0 – 60 m /h to 0 – 300 m /h )
3 3
(0 – 110 m /h to 0 – 550 m /h )
3 3
(0 – 175 m /h to 0 – 875 m /h )
3 3
(0 – 250 m /h to 0 – 1250 m
3 3
(0 – 350 m /h to 0 – 1750 m
3 3
(0 – 450 m /h to 0 – 2250 m
3 3
(0 – 710 m /h to 0 – 3550 m
3 3
/h to 0 – 5000 m
Specification
TIC-LF502A
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