LF470/LF622
2.5,4,6mm (1/10",1/6”,1/4")
Field Intelligent Device Series
Electromagnetic Flowmeter
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.
LF622
LF470
Figure2. Electromagnetic Flowmeter
LF470/LF622
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
Certificationnumber
Z01207
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
The AF900 hand-held terminal (HART*1
LF622 converter is shown in the following table.
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.
Flow rate as a
percent of range
Accuracy
0.3-1.0m/s
1.0-10m/s
(1.0-3.3ft/s)
0.8% of FS
0.8% of FS
(3.3-32.8ft/s)
50 100
0.8% of rate
～ ％
50
～ ％
±
±
±
±
0
0.4% of FS
*1: HARTprotocol (Highway Addressable Remote Transducer) is a
communication protocol for industrial sensors recommended by the
HCF (HARTCommunication Foundation).
Note: The accuracy is measured under standard
operating conditions at Toshiba's calibration facility.
*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.
Fluid conductivity: 50µS/cm minimum
Fluid temperature:
Pipe connection material Fluid temperature
Stainless steel and other metals
*3: Modbus is the communication protocol that Modicon Inc. developed.
Physical layer is RS485.
10 120
－ ℃～＋ ℃
(
)
14 to 248 F
°
Polyvinyl chloride
(shock-resistant)
10
60
°
－ ℃～＋ ℃
Fluid to be
measured
(14 to 140 F)
Ambient temperature: –10 to +60 °C (14 to 140 °F)
Powersupply
Signalcable
Structure: IP67
Excitationcable
Power consumption:
4-20mA dc output
andpulseoutput
・When combined with the LF622 converter:
LF470
LF622 Converter
Detector
Standard:10W(14VA)
at AC100V and Excitation current:0.2A
MAX:15W (22VA)
Figure1. ConfigurationDiagram
EJL-142A
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LF470/LF622
Conditions when power fails: Parameter setting
Communications output:
・HART(std.)
values are stored in non-volatile memory and the
values will be restored when the power returns to
normal condition. The outputs and display will
remain as follows when power fails.
Digital signal is superimposed on 4–20mAdc
current signal as follows:
Conforms to HART protocol
Load resistance: 240 to 750ꢀ
Load capacitance: 0.25µF maximum
Load inductance: 4mH maximum
• PROFIBUS(opt.)
Protocol : PROFIBUS-PA
Baurate : 31.25kbps
• Current output: 0mAdc
• Digital output: OFF
• LCD display: No display
Power supply: One of the following can be selected:
• 100 to 240Vac, 50/60Hz (std.)
(allowable voltage 80 to 264Vac)
• 24Vdc (allowable voltage 18 to 36Vdc)
• 110Vdc (allowable voltage 90 to 130Vdc)
Bus voltage : 9-30VDC
Consumption electric current of bus:less than 16mA
Manufacture Ident-No. : 093BHEX
Standard Ident-No. : 9740HEX
Surge protection: Arresters are installed in the
power supply, and current signal output circuit.
Slave address : 0-126 (Default address is 126)
Profile : Profile Ver.3.01 for Process Control
Devices
Function blocks : AI(Flow)×1 , Totalizer×1
• Modbus(opt.)
Physical layer : RS485
Protocol : Modbus
Mode : RTU
Baudrate : 4800, 9600, 19200bps
Data length : 8bit
Case: Aluminum alloy (equivalent of IP 67)
Coating: Acrylic resin-baked coating, pearl-gray
colored
Cable connection ports:
Cable glands —
LF622 :Provided as standard
OD of cableφ6mm
Material Nylon 66
G (PF) 1/2 male screws.
Parity bit : None, Odd, Even
Stop bit : 1bit, 2bit
Error check : CRC-16
Max. station number : 32(with Master device)
Max. cable length : 1.2km (Note)
Note: When PROFIBUS or Modbus option is
specified , cable gland size is φ6～
8mm for signal cable, φ11～13mm
for power cable
Applicable diameter — 11 to 13mm
Note: This length is specification of 3 line
connection.
(0.433 to 0.512 inch)
Vibration resistance:
LCD display:
No resonance to the following levels of vibration:
• 10 to 150Hz with acceleration of 9.8m/s2
Full dot-matrix 128×128 dot LCD display
(back-light provided)
• Vibration of 30Hz with 29.4 m/s2 in 4h in each
direction will not cause any defect to unit.
Parameter settings — Parameters can be set as
follows:
Note: Avoid using the flowmeter in an
• IR Switches: Three key switches are provided to
set configuration parameters.
environment with constant vibration.
Converter LF622 dimensions :
• Digital communication: The AF900 hand-held
See Figure 5 (for Separate type)
terminal is needed to set parameters.
MTBF:220,000 hours at 25 deg.C (77 deg.F) based
on MIL-HDBK-217F
•Zero adjustment: Zero point adjustment can be
started by pressing the switch in the converter.
Damping: 0.5 to 60 seconds (selectable in one
second increments)
Zero and span calibration: Built-in calibration
signal source allows converter unit check.
3
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LF470/LF622
Installation
ꢀ Dimensions
Unit:mm(inch)
56 (2.20)
86 (3.39)
75 (2.95)
30 (1.18)
**
*
*
**
Detector mounting plate
(4mm thick)
2-φ6 (φ0.24) hole
Signal cable
φ7(φ0.28)
Excitation
4-φ5 (φ0.20) hole
*
70 (2.76)
Mounting screws
Note:1inch=25.4mm
*
This length becomes 78mmif the pipe
connection port thread is Rc(PT)1/2
If a mounting plate is needed for the LF470, fix the plate (a)
above to the bottom of the LF470. Depending on which pair of
screwholes used, themountinganglechanges by90°.
2-M4
(Mounting screw holes)
Note:1inch=25.4mm
Figure4. LF470 Mounting Board
Figure3. LF470 Dimensions
Attachment
Unit:mm(inch)
LCDdisplay
I/Ocableground
Excitationcableground
Powersupply
cableground
Signalcableground
Optioncableground
IRSwitch
Note: Cable glands are not provided for LF622F cFMus approved type.
Refer to the part Cable connection port at detector.
Weight : Approx. 3.5 Kg (7 lb)
Note:1inch=25.4mm
Figure5. Separate typeconverter LF622
4
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LF470/LF622
SeparatetypeLF470/LF622 flowmeter
Instrument panel : Ordered separately
Grounding with 100Ω or less
Ⅳwire 5.5mm2 or more
ground resistance
Power switch
(External double-pole power switch)
Grounding with 100Ω or less
ground resistance
Power supply
Thick walled steel conduit
Signal cable
Currentoutput(4～20mAdc)
or PROFIBUS
Digital input
(2-wire shielded hard-rubbersheathed cable)
(20～30Vdc)
Excitation cable
(3-wireshielded hard-rubber cable)
or Modbus
Digital output 2
Signal common forDIand DO
Digital output 1
Grounding with 100Ω or less
Power cable
Connected detector
I/O cable
ground resistance
Symbol
L1 (＋)
L2 (－)
GND
FG
Description
Cable
Power supply
Power cable
Ground (for arrester)
Frame ground
DI
DO1
Digital Input (20～30Vdc)
Digital Output 1
DO2
COM
Digital Output 2
Signal Common for DI, DO1, DO2
I/O cable
Current Output (4～20mAdc)
＋
Shielded cable for
PROFIBUS-PA
or PROFIBUS
－
X
Y
E
A
B
G
Excitation cable
Signal cable
Excitation Output
Signal Input
Note: Symbol of the terminal is changed as follows for Modbus.
DO2 → T+, DI → T-, COM → T
Symbol
T+
T-
TG
Description
Modbus(+)
Modbus(-)
Cable
Twist-pair polyethylene
insulated vinyl sheath cable
(JKEV,AWG24(0.2mm2))
Modbus(GND)
Figure 6. Separate type LF470/LF622 flowmeters wiring Diagram
5
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LF470/LF622
fluid is flowing or not.
(3) The fluid to be measured must be held still in the
pipe when the LF470 is being adjusted. If the fluid
can not be stopped after the LF470 installation,
install a bypass pipe in parallel with the LF470
flowmeter.
ꢀWiring Precautions
(1) Connect the following two cables correctly:
1) signal cable (on the right facing the LF470)
2) excitation cable (on the left facing the LF470)
See figure3.
(2) Do not bend apply excessive force to these cables.
(3) DO1, DO2 (opt.), and DI (opt.) use the same
common terminal (COM). This COM can not
connect to other equipments which have their
own ground terminal. (Power supply for
connecting to DI or DO, etc…) Need to wire
separately.
ꢀMeter size
To select the meter size:
See Table 1 to 2 and find meter sizes within the
velocity of 0.1 to 10m/s (0.3 to 32.8 ft/s) for a
specified full-scale (measuring range high limit)
flow. Select one that has its full-scale velocity
between 1 and 3m/s (3.0 and 10 ft/s).
ꢀ Wiring Precautions (PROFIBUS or Modbus)
Note: Make sure the full-scale flow rate used for the
final planning stage stays within 10m/s (32.8 ft/s)
in terms of flow velocity.
(1) For wiring path, avoid places near electrical
equipment that may cause electromagnetic
induction or electrostatic induction interference
(such as a motor, transformer and wireless
transmitter).
(2) Use a PROFIBUS-PA cable or a RS485 twist-pair
cable for signal cable. In addition, make sure to
use a shielded cable to improve noise resistance.
Furthermore, installation of signal cable in metal
conduit is recommended.
Table 1. Meter size and Flow Velocity(SI unit)
Unit:L/min
Meter size
0.3m/s
1m/s
3m/s
10m/s
(mm)
2.5
4
0.08835
0.2262
0.5088
0.2945
0.7540
1.6967
0.884
2.262
5.090
2.945
7.540
16.967
6
(3) General cables are designed for indoor use where
cables are not exposed to humidity, rain, etc.
When you install cables, make sure to check the
operating conditions such as the operating
temperature range of the cable by contacting its
manufacturer.
(4) When you carry out cable end treatment of cable,
use a dedicated cable stripper etc. so that the core
wire of the cable will not be nicked or damaged.
In addition, for cables, be careful of allowable
maximum bend diameter etc. (Basically, do not
install cables in a way cables are twisted or bent.).
Table 2. Meter size and Flow Velocity (US unit)
Unit:gal/min
Meter size
0.98 ft/s
3 ft/s
10 ft/s
32.8 ft/s
(inch)
1/10”
1/6”
0.02334
0.05975
0.1344
0.07115
0.1821
0.4098
0.2372
0.6071
1.3660
0.7781
1.992
4.482
1/4”
ꢀAbout establishment environment
Do not store or install the flowmeter:
• Where there is direct sunlight.
• Where excessive vibration or mechanical shock
occurs.
(5) Consider installing a PROFIBUS-PA arrester in
the communication path of PROFBUS-PA so that
the electromagnetic flowmeter will not be affected
by lightning etc.
• Where high temperature or high humidity
conditions exist.
(6) The electromagnetic flowmeter is not equipped
with terminating resistors. Use the terminating
resistor unit for PROFIBUS-PA or junction box,
if necessary.
(7) Only one PROFIBUS-PA cable goes through a
cable gland of the Electromagnetic Flowmeter.
Please use the junction box at system
configuration.
• Where corrosive atmospheres exist.
• Places that can be submerged under water.
• Where there is a sloped floor. To put the flowmeter
temporarily on the floor, place it carefully with
something, such as a block, to support it so that the
flowmeter will not topple over.
(8) Install a terminator to flowmeter that connected to
end of Modbus network.
In areas like the following, there may be the case that
infrared switches do not function correctly. (If these
are unavoidable, use an appropriate cover.)
ꢀPiping Precautions
(1) Where unit (operation panel) is exposed to direct
sunlight, reflection of light onto window pane and
diffused light reflection.
(1) Connect the fluid pipe to the pipe connection port
using a joint that matches the Rc (PT) female
screw. Use seal tapes when connecting the pipe to
the port to prevent a fluid leakage. Do not tighten
the connection screw too much.
(2) Design piping so that the detector’s pipe is always
filled with the fluid to be measured, whether the
(2) Where smoke and steam may occur.
(3) Where exposed to direct snow, ice or mud.
6
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LF470/LF622
ꢀ Calibration Range
If the calibration range is not specified, the standard
range as shown below will be used. If the range is
specified, we will use the specified range for
calibration.
Table 3. Standard Flow Range
Meter
Standard flow range
size
mm
(inch)
Flow
velocity
Flow
velocity
Flow rate
Flow rate
(m³/h)
0.050
0.100
0.200
(m/s)
2.829
2.211
1.965
(gal/min)
0.500
(ft/s)
2.5 (1/10)
4 (1/6)
6 (1/4)
21.084
24.707
29.283
1.500
4.000
Note: The unit of "gal/min" is not exchanged
(converted) by "m3/h".
Ordering Information
1. When ordering the LF470 flowmeters, refer to
Tables 4 to 5 (Specification Code).
An entry must be made for each of the columns in
each of these tables.
2. Fluid characteristics:
(1) Typeoffluidtobemeasuredandits characteristics
(2) Fluid temperature
(3) Fluid pressure
(4) Electrical conductivity of the fluid
3. Measuring range
4. I/O function setting
5. Ordering scope:
Flow calibration data: (required or not)
6. Other items
Specifications other than standard items
Consult aToshibarepresentativebeforeorderingwhen
choosing materialsofthewettedpartssuchaslining,
electrodes, andgroundingrings.
7
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LF470/LF622
Table4. SpecificationCode ( LF470Detector)
Model
Specification Code
Description
1 2 3 4 5 6 7 8 9 10 11 12 13 14
L F 4 7 0
LF470 Flowmeter
Meter size
2
4
6
2.5 mm (1/10")
4 mm (1/6")
6 mm (1/4")
Converter ( Separate type ) combined
LF622
D
Pipe connection port (adapter)
Rc (PT) 1/4 female screw (standard)
Rc (PT) 1/8 female screw
Rc (PT) 3/8 female screw
Rc (PT) 1/2 female screw
NPT1/4 female screw
A
B
C
D
E
F
NPT3/8 female screw
G
NPT1/8 female screw
Pipe connection material
316 stainless steel (standard)
Ti (titanium)
Polyvinyl chloride (shock0-resistance) +
Ta (Tantalum) for grounding plate
Polyvinyl chloride (shock0-resistance) +
Pt-Ir for grounding plate
Hastelloy C (Equivalent)
Packing used between main body and pipe
connection adapter
A
D
E
F
H
C
D
G
Acid-resistant ceramic
Alkali-resistant ceramic
Ammonia-resistance
Mounting
A
B
Not provided
Provided, 304 stainless steel
Flow and calibration velocity range
0.3 to 10 m/s (standard range calibration)
0.3 to 10 m/s (specified range calibration)
Cable length
A
B
A
1
5m (cable dia.7mm)
10m (cable dia.7mm)
2
15m (cable dia.7mm)
3
20m (cable dia.7mm)
4
25m (cable dia.7mm)
5
30m (cable dia.7mm)
B
5m or more
(extension dia. 12mm+Scotch cast connection)
Coating
A
Z
Phthalic acid resin coating pearl-gray colored (standard)
Other
8
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LF470/LF622
Table5. SpecificationCode ( LF622Converter)
Model
Specification Code
LF622 type
Contents
1 2 3 4 5 6 7 8 9 1011121314
L F 6 2
2
Electromagnetic flowmeter converter
Separate (Remote) type
Purpose
Standard
Shape
ꢂ
ꢂ
ꢂ
A
A
Separate type with case
Converter mounting fitting
None
Panel, Accessory for wall mounting (BNP material: SUS304)
Accessory for pipe installation (BNP material: SUS304)
Digital input/output
ꢃ
ꢂ
ꢃ
A
C
E
ꢂ
2
Digital output points 2 (DO1+DO2) +Digital input point 1 (DI)
Current output and Communication function(Note1)
Current output + HART communication
PROFIBUS communication
ꢂ
ꢃ
ꢃ
1
2
3
Modbus (RS485) communication
Power supply(Note2)
100Vac-240Vac, 50/60Hz
24Vdc
ꢂ
ꢃ
ꢃ
1
2
3
110Vdc
Instruction manual
English
ꢂ
F
Note 1: When Modbus communication is provided, digital output points 1(DO1) and digital output points(DO2), digital input point
1(DI), HART communication cannot be used.
When PROFIBUS communication is provided, current output(4-20mA) and HART communication cannot be used.
Check Table 6 for the details.
Note 2: Select 110Vdc for test report inspected under the condition of 110Vdc.
Table 6. Communication function and output selection table
Selection of Function
Availability of outputs
Code
(10th digit)
Selected
4-20mAdc
DO1
DO2
DI
Communication
1
2
HART
ꢁ
ꢁ
ꢁ
ꢁ ꢁ
ꢁ ꢁ
PROFIBUS
Ｘ
ꢁ
3
Modbus
ꢁ
Ｘ
Ｘ
(Note)
Code explanation: ꢁ:Available Ｘ:Not Available
Note : When digital output 1 function and Modbus communication function are used at one time, TG (signal ground) of
the Modbus communication function cannot be connected (2 line connection).
ISO9001 and ISO14001 are certified.
Specifications are subject to change without notice.
Printed in Japan 2011-5 (TDOC)
Misuseofthisroductcanresultindamagetopropertyorhumaninjury.
Readrelatedmanualscarefullybeforeusingthisproduct.
© TOSHIBA Corporation 2011
All Rights Reserved.
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