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EJL-142A
Field Intelligent Device Series
Electromagnetic Flowmeter
LF470/LF6
2
2
2.5,4,6mm (1/10",1/6”,1/4")
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 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 4–20 mA 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 electrodes and are
applicable to almost any kind of fluids. The LF470 is a
lightweight palm-sized detector.
Combining with a LF622
multifunctional converter
which has an improved 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 90, 180 and 270
degrees without opening the cover
The AF900 hand-held terminal (HART*
1
communicator) can be used to communicate with the
flowmeter from a remote place. PROFIBUS-PA*
2
or
Modbus*
3
interface 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
fieldbus which digitizes all signals. Flowmeters support
PROFIBUS-PA.
*3: Modbus is the communication protocol that Modicon Inc. developed.
Physical layer is RS485.
Figure 2. Electromagnetic Flowmeter
LF470/LF622
Specifications
Overall Specifications
Measurement range in terms of flow velocity:
0–0.3 m/s to 0–10 m/s. (0–1.0ft/s to 0–32.8ft/s).
Accuracy: The overall accuracy combined with the
LF622 converter is shown in the following table.
Accuracy Flow rate as a
percent of range
0.3-1.0m/s
(1.0-3.3ft/s)
1.0-10m/s
(3.3-32.8ft/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 10 120
(
°
)
Polyvinyl chloride
(shock-resistant)
10 60
°
Ambient temperature: –10 to +60 °C (14 to 140 °F)
Structure: IP67
Power consumption:
When combined with the LF622 converter:
Standard:10W(14VA)
at AC100V and Excitation current:0.2A
MAX:15W (22VA)
Fluid to be
measured
Signal cable
Excitation cable
Power supply
4-
20mA dc output
and pulse output
LF622 Converter
LF470
Detector
Figure 1. Configuration Diagram
LF470
LF622
Certification number
Z01207