Toshiba LF620 B Series User manual

6 F 8 A 0 9 9 7
Electromagnetic Flowmeter Converter
LF620*B Type, LF622*B Type
INSTRUCTION MANUAL
NOTES
Before using the equipment, please read this manual carefully and understand the
contents, and then use the equipment correctly.
•
NEVER attempt to operate the equipment in any ways that are not described in this
instruction manual.
•
After reading this manual, store it with care in a place where it can be referred to
whenever needed.
•
Please be sure that this manual is delivered to the personnel who will use this
product.

－1 －
6 F 8 A 0 9 9 7
NOTICE
We thank you very much for your purchase of our LF62**B series electromagnetic
flowmeter converter.
Integral type converter LF620*B
Separate type converter LF622*B
This instruction manual describes the notes on using an electromagnetic flowmeter
converter, installation, configuration and maintenance. It is intended for the personnel in
charge of installation, operation and maintenance.
To use this product properly and safely, read this manual carefully before using this product.
After reading this manual, store it in a place where it can be referred to
whenever needed.
About aModbus communication function, please read each instruction manual.
This manual uses the following markers to identify the integral type or separate type when it
describes items specific to the integrated type or separate type. Items without this marker are
common items to the integral type and separate type.
Integral type converter LF620*B:
Separate type converter LF622*B:
Toshiba LF62**B
series electromagnetic flowmeter converters can be used in combination
with various types of electromagnetic flowmeter detectors.
For the notes on usage, piping, in
stallation, configuration and maintenance of the
combined detector, ch
eck the model number of the combined detector and read the
instruction manual of the relevant detector.
About Safety Precautions
Read the Safety Precautions described at the front carefully and understand the contents
before using this product.
The “Safely symbols” used in the “Safety Precautions” are shown in a location such as
in the margin to the left of the corresponding commentary in the main text.
NOTES
1. The reproduction of the contents of this Manual in any form, whether wholly or in
part, is not permitted without explicit prior consent and approval.
2. The information contained in this Manual is subject to change or review without
prior notice.
3. Be sure to follow all safety, operating and handling precautions described in this
Manual and the regulations in force in the country in which this product is to be
used.
Rev0 Sep., 2022
LF620*B
LF622*B

－2 －
6 F 8 A 0 9 9 7
SAFETY PRECAUTIONS
Safety signs and labels affixed to the product and/or described in this manual give important information
for using the product safely. They help prevent damage to property and obviate hazards for
persons using the product.
Make yourself familiar with signal words and symbols used for safety signs and labels. Then read the safety
precautions that follow to prevent an accident involving personal injury, death or damage to property.
Explanation of signal words
The signal word or words are used to designate a degree or level of hazard seriousness.
The signal words used for the product described in this manual are WARNING and CAUTION.
WARNING
Indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not avoided,
may result in minor to moderate injuries or in property
damage.
Notes:
1 “Serious injury” refers to an injury such as loss of sight, physical damage, burns (high
temperature or low temperature) electric shock, bone fracture and poisoning and the after
effect of the injury remains or the injury requires hospitalization or long periods of
outpatient treatment.
2 “Minor to moderate injuries” refers to burns, electric shocks, and so on, that do not require
the injured person to be hospitalized or go to a hospital for a long period of time for
medical treatment. “Property damage” includes all kinds of damage to property, equipment
or materials.
Safety symbols
The following symbols are used in safety signs and labels affixed to a product and/or in the manual for
giving safety instructions.
Indicates an action that is prohibited. Simply DON’T do this action.
The prohibited action is indicated by a picture or text inside or next to the circle
Indicates an action that is mandatory. DO this action.
The mandatory action is indicated by a picture or text inside or next to the circle.
Indicates a potential hazard. The potentially hazardous situation is
indicated by a picture or text inside or next to the triangle.
Color explanation
WARNING Background color: Yellow and Red, Border: Black, Picture display: Black
CAUTION Background color: Yellow, Border: Black, Picture display: Black

－3 －
6 F 8 A 0 9 9 7
SAFETY PRECAUTIONS (continued)
Safety Precautions for Installation and Wiring
CAUTION
Do not use the LF620*B and LF622*B in an
explosive atmosphere.
Use an appropriate device to carry and install the
LF620*B and LF622*B.
DON’T
Using this product in an
explosive atmosphere can
cause explosion.
DO
If this product falls to the ground,
injury, or malfunction of or damage to
the product, can be caused.
Install a switch and fuse to isolate the
LF620*B and LF622*B from mains power.
Do not modify or disassemble the LF620*B and
LF622*B unnecessarily.
DO
Power supply from mains
power can cause electric
shock or circuit
break-down.
DON’T
Modifying or disassembling this
product can cause
electric shock,
malfunction of or damage to this
product.
Turn off mains power before conducting
wiring work.
Ground the LF620*B and LF622*B independently
from power equipment. (100 ohm or less
ground resistance)
DO
Wiring while power is
applied can cause electric
shock.
DO
Operating this product
without grounding can cause
electric shock or malfunction.

Turn off mains power before working on
pipes.
■ Use crimped terminal lugs for the terminal board
and GND terminal.
DO
Working on pipes while
power is applied can cause
electric shock.
DO
Loose connections can cause
electric shock, fire from excessive
current or system malfunction.
Do not conduct wiring work with bare hands. Do not work on piping and wiring with wet hands.
DON’T
Remaining electric
charge even if power is
turned off can still cause
electric shock.
DON’T
Wet hands may result in electric
shock.
The label shown left is placed near the terminal board for power supply
on the converter.
Be alert to electric shock.

－4 －
6 F 8 A 0 9 9 7
SAFETY PRECAUTIONS (continued)
Safety Precautions for Maintenance and Inspection
CAUTION
Do not touch the LF620*B main body
when high temperature fluid is
being measured.
Do not conduct wiring work when power is
applied.
DON’T
The fluid raises the main
body temperature and can
cause burns when touched.
DON’T
Wiring while power is applied can
cause electric shock.
Do not conduct wiring work with wet
hands.
The label shown left is placed near
the terminal board for power input.
(A black border and symbol on
yellow triangle)
Be alert to electric shock.
DON’T
Wet hands may result in
electric shock.
Do not use a fuse other than the one
specified.
Use a rated fuse as follows:
Fuse rating:
• 1A/250V for 100 to 240Vac or 110Vdc
• 2A/250V for 24 V dc
Dimensions:
Diameter 5.2 mm × 20 mm
Melting time characteristic:
• Time Lag Fuses for 100 to 240Vac or 110Vdc
• Normal blow type for 24 V dc
DON’T
Using a fuse other than the
one specified can cause
system failure, damage or
malfunction.
Usage limitation
(1) This product is not manufactured for applying to a system requiring safety directly involved
human life as follows. Please contact your nearest Toshiba reprehensive if there is a possibility of
using this product for such use.
- Main control systems of nuclear power plants, safety protection systems in nuclear
facilities or other important systems requiring safety
- Medical control systems relating to life support
(2) This product is not approved for explosion-proof applications. Please do not use this product in
an explosive atmosphere (explosion protection area).
Warranty and Limitation of Liability
Toshiba does not accept liability for any damage or loss, material or personal, caused as a direct or indirect
result of the operation of this product in connection with, or due to, the occurrence of any event of force
majeure (including fire or earthquake) or the misuse of this product, whether
intentional or accidental.

－5 －
6 F 8 A 0 9 9 7
Handling Precautions
To obtain the optimum performance from the LF620*B and LF622*B converter for years of continuous
operation, observe the following precautions.
(1) Do not store or install the flowmeter in :
・Where there is direct sunlight.
・Where excessive vibration or mechanical shock occurs.
・Where high temperature or high humidity conditions obtain.
・Where corrosive atmospheres exist.
・That can be places 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.
・Places where there is following factors.
■Factors to impede infrared switch to operate properly
・Intense light such as direct sunlight and reflected sunlight by window glass or metal plate
・Place where brightness changes suddenly such as ON/OFF of lighting
・Dense smoke or steam near the control panel
・
Those attached on the control panel such as rain (dew drop), snow, ice, mud and oil, and
haze due to their attachment
・Light reflecting object near the control panel, or reflecting object such as metal plate placed
opposing to the control panel
When any of above factors is considered, take a measure for the proper operation of infrared
switch such as to place a cover or to secure a space for at least a person to stand in front of the
control panel.
When unable to avoid above factors, operate the EMF converter removing the factor by
covering the control panel by hand so that light does not shine on it, by cleaning those attached
on the control panel, or by standing in-between the reflecting object and the control panel to
block the light.
(2) Wire cables correctly and securely.
Be sure to ground at the combined converter side (grounding resistance 100Ωor less). Avoid a
common ground used with other equipment where earth current may flow. An independent
ground is preferable
(3) Select cable paths away from electrical equipment (motors, transformers, or radio transmitters),
which causes electromagnetic or electrostatic interference.
(4) The cable lead-in section must be tightened securely to keep air tightness.
The blind plate attached to the cable gland is used for dust prevention during shipment.
When cables are not put through the cable gland, perform the procedures for protection against
dust, and waterproofing.
(5) If the inside of the converter or cable terminals are wetted or humidified, it may cause insulation
deterioration, which can result in fault or noise occurrence. So do not conduct wiring in the
open air on rainy days.
Also, be careful not to wet down the converter even in the case of indoor wiring, and complete
wiring work in a short period of time.

－6 －
6 F 8 A 0 9 9 7
Handling Precautions (continued)
(6) The converter housing covers and the cable glands are tightened securely at the time of
shipment. Do not remove these covers or glands unless it is necessary to wire new cables or
replace old ones. Otherwise, gradual deterioration of circuit isolation or damage to this product
can be caused.
(7) Observe the following precautions when you open the converter housing cover:
•Do not open the cover in the open air unprotected against rain or wind. This can cause
electric shock or cause damage to the flowmeter electronics.
•Do not open the cover under high ambient temperature or high humidity
conditions or in corrosive atmospheres. This can cause deterioration of system
accuracy or cause damage to the flowmeter electronics.
•When opening and closing the converter housng cover, be careful not to pinch your
fingers on the cover.
(8) Since a varistor is built in converter, do not conduct a withstand voltage test for the
converter.
In addition, the voltage for checking the insulation of the converter must be 250VDC or
lower.
(9) This product may cause interference to radio and television sets if they are used near the
installation site. Use metal conduits etc. for cables to prevent this interference.
(10) Radio transmitters such as transceivers or cellular phones may cause interference to the
flowmeter if they are used near the installation site. Observe the following precautions when
using them:
•Close a transmitter cover before using a transceiver.
•Do not use a transceiver whose output power is more than 5 W.
•Move the antenna of a transceiver or a cellular phone at least 50 cm away from the flowmeter
and signal cables when using it.
•Do not use a radio transmitter or a cellular phone near the flowmeter while it is
operating online. The transmitter or cellular phone’s output impulse noise may interfere with
the flowmeter.
•Do not install a radio transmitter antenna near the flowmeter and signal cables.
(11) For reasons of flowmeter failure, inappropriate parameters, unsuitable cable
connections or poor installation conditions, the flowmeter may not operate properly. To
prevent any of these problems causing a system failure, it is recommended that you have
preventive measures designed and installed on the flowmeter signal receiving side.
(12) For piping and installation of the combined detector, check the model number of
detector and read the instruction manual of the relevant detector.
*We assume no responsibility for nonconformity caused by violation of precautions described in
this manual or used in violation of the installation method and the operation method stipulated in
a relevant ordinance or other regulations.

－7 －
6 F 8 A 0 9 9 7
Table of Contents
1. Product Inspection and Storage...........................................................................................................................11
1.1 Product Inspection........................................................................................................................................11
1.2 Storage..........................................................................................................................................................11
2. Overview.................................................................................................................................................................12
3. Names of Parts.......................................................................................................................................................13
3.1 Appearance...................................................................................................................................................13
3.1.1 Appearance of LF620*B Type.........................................................................................................13
3.1.2 Appearance of LF622*B Type.........................................................................................................14
3.2 Construction of the terminal blocks...............................................................................................................15
3.2.1 Terminal Block Construction of LF620*B Type...............................................................................15
4. Installation..............................................................................................................................................................16
4.1 Notes on Selecting the Installation Location.................................................................................................17
4.2 How to Install.................................................................................................................................................18
4.2.1 LF620*B Type.................................................................................................................................18
4.2.2 LF622*B Type.................................................................................................................................18
5. Wiring......................................................................................................................................................................21
5.1 Cables...........................................................................................................................................................22
5.2 External Device Connections and Grounding...............................................................................................23
5.2.1 LF620*B Type.................................................................................................................................23
5.2.2 LF622*B Type.................................................................................................................................24
5.3 Notes on Wiring.............................................................................................................................................25
5.3.1 Notes on Instrumentation-Converter Wiring....................................................................................25
5.3.2 Notes on Wiring of the LF622*B Type.............................................................................................25
5.4 Wiring............................................................................................................................................................26
5.4.1 Grounding.......................................................................................................................................26
5.4.2 Terminal Treatment of Cables.........................................................................................................28
5.4.3 Cable Connection............................................................................................................................30
5.5 Digital I/O Connections.................................................................................................................................32
6. Operation................................................................................................................................................................33
6.1 Preparatory check.........................................................................................................................................33
6.2 Zero Adjustment............................................................................................................................................34
7. LCD Display and Controls.....................................................................................................................................35
7.1 Name and Function of Each Part of LCD Display.........................................................................................35
Instructions...............................................................................................................................................................35
7.2 Basic operations............................................................................................................................................42
7.2.1 Mode Change..................................................................................................................................42

－8 －
6 F 8 A 0 9 9 7
7.2.2 Setting and Calibration....................................................................................................................46
7.3Configuration Items Selection Table.............................................................................................................50
7.4 Password input..............................................................................................................................................52
8. Parameter Settings.................................................................................................................................................53
8.1 Parameter Setting Items ...............................................................................................................................53
8.2 Check/Change of Parameters.......................................................................................................................54
8.2.1 Menu Configuration Selection Screen.............................................................................................54
Function A: Detector Settings........................................................................................................................55
8.2.2 Exciting Current Value (Function A-1).............................................................................................55
8.2.3 Meter Size (Function A-2)...............................................................................................................56
8.2.4 Exciting Frequency (Function A-3)..................................................................................................58
8.2.5 Flow Direction Setting (Function A-4)..............................................................................................59
Function B: Display Settings.........................................................................................................................60
8.2.6 Display Setting (Function B-1, B-2).................................................................................................60
8.2.7 Custom Coefficient Setting (Function B-2)......................................................................................64
8.2.8 Custom Unit Setting (Function B-3).................................................................................................65
Function C: Range Settings..........................................................................................................................66
8.2.9 Span (Range) (Function C).............................................................................................................66
Function D: Filter Settings.............................................................................................................................73
8.2.10 Damping Constant (Function D-1)...................................................................................................73
8.2.11 Rate-Of-Change Limit and Control Limit Time (Function D-2)........................................................74
Function E: Low Cutoff Settings....................................................................................................................76
8.2.12 Low Cutoff (Function E-1)...............................................................................................................76
8.2.13 Display Low Cutoff (Function E-2)...................................................................................................77
Function F: Zero Point Setting.......................................................................................................................78
8.2.14 Still Water Zero Adjustment (Function F-1).....................................................................................78
8.2.15 Manual Zero Adjustment (Function F-2) .........................................................................................79
Function G: Current Output Setting...............................................................................................................80
8.2.16 4−20mA Alarm Output Setting (Function G-1)................................................................................80
8.2.17 Output Low Limit Setting (Function G-2).........................................................................................81
Function H: Digital Output Settings...............................................................................................................82
8.2.18 Digital Output (Function H)..............................................................................................................82
Function I: Digital Input Settings....................................................................................................................84
8.2.19 Digital Input (Function I)..................................................................................................................84
Function J: Count and Pulse Settings...........................................................................................................86
8.2.20 Count Rate (Pulse Rate), Pulse Width Setting Mode and Pulse Width (Function J).................86
Function K: Preset Settings...........................................................................................................................89
8.2.21 Preset Count (Function K-1)............................................................................................................89
8.2.22 Preset Mode (Function K-2)............................................................................................................91
Function L: High/Low Alarm Settings............................................................................................................92
Function M: High-High/Low-Low Alarm Settings...........................................................................................92
8.2.23 Flow Rate High/Low Alarm and High-High/Low-Low Alarm (Function L, Function M)............92
Function N: Self-diagnosis Function Settings................................................................................................94
8.2.24 Empty Pipe Alarm Setting (Function N-1).......................................................................................94
8.2.25 Self Diagnosis ON/OFF Setting (Function N-2)...............................................................................95
8.2.26 Converter Alarm (Function N-3)......................................................................................................96
Function O: Fixed Value Output Settings......................................................................................................97
8.2.27 Fixed Value Output (Function O-1).................................................................................................97
Function P: Other Settings 1.......................................................................................................................100
8.2.28 Password Setting (Function P-1)...................................................................................................100
8.2.29 LCD Adjustment (Function P-2)....................................................................................................104

－9 －
6 F 8 A 0 9 9 7
8.2.30 Switch Position Setting (Function P-3)..........................................................................................105
8.2.31 Backlight Adjustment(Function P-4)..............................................................................................107
Function Q: Other Settings 2.......................................................................................................................108
8.2.32 UNIT Serial Display (Function Q-1)...............................................................................................108
8.2.33 Detector Type Setting (Function Q2) ............................................................................................108
Function R: Other Settings 2.......................................................................................................................109
8.2.34 Short Circuit Detection Function Setting(Function R1)..................................................................109
Function S: Communication Settings..........................................................................................................110
8.2.35 Modbus Communication Setting (Function S1).............................................................................110
9. Calibration.............................................................................................................................................................113
9.1 Calibration Items.........................................................................................................................................113
9.2 Converter Check / Calibration.....................................................................................................................114
9.2.1 0 % Flow Rate Calibration (Zero Calibration)................................................................................114
9.2.2 50 % Flow Rate Calibration...........................................................................................................115
9.2.3 100 % Flow Rate Calibration (Span Calibration)...........................................................................115
9.2.4 Checking the Excitation Current....................................................................................................115
10. Functional Description ........................................................................................................................................116
10.1 Digital I/O Specifications.............................................................................................................................117
10.2 Totalizer and Pulse Output..........................................................................................................................118
10.3 Multi-range Function ...................................................................................................................................122
10.4 Flow Rate High/Low, High-High/Low-Low Alarm Output.............................................................................127
10.5 Preset Count Function................................................................................................................................129
10.6 Remote Zero Adjustment............................................................................................................................132
10.7 Remote Selection of Fixed Value Output....................................................................................................132
10.8 Converter Failure Alarm..............................................................................................................................133
10.9 Multiple range high/low limit alarm function................................................................................................134
10.10 Custom unit function...................................................................................................................................136
11. Communications Function..................................................................................................................................139
11.1 Connections with configurator.....................................................................................................................139
11.2 Notes on Communications..........................................................................................................................141
12. Self Diagnosis and Alarms..................................................................................................................................142
12.1 Self-Diagnosis.............................................................................................................................................142
12.2 Output Status for Errors and Alarms...........................................................................................................145
13. Maintenance and Troubleshooting.....................................................................................................................146
13.1 Maintenance................................................................................................................................................146
13.2 Troubleshooting..........................................................................................................................................149
13.2.1 Flow rate is not indicated. .............................................................................................................149
13.2.2 Flow rate indication is not correct..................................................................................................150
13.2.3 Flow rate indication is not stable...................................................................................................151
13.2.4 The switches become inoperable..................................................................................................152
14. Principle of Operation..........................................................................................................................................153

－10 －
6 F 8 A 0 9 9 7
15. Specifications.......................................................................................................................................................154
15.1 Specifications..............................................................................................................................................154
15.2 Model Number Table...................................................................................................................................158
16. Outline Drawing....................................................................................................................................................159
16.1 LF620*B Type.............................................................................................................................................159
16.2 LF622*B Type.............................................................................................................................................160
Appendix 1 Reverse Lookup of Functions based on Applications..........................................................................161
Appendix 2 Factory Default/ Standard Values ...........................................................................................................163

－11 －
6 F 8 A 0 9 9 7
1. Product Inspection and Storage
1.1 Product Inspection
LF62**B electromagnetic flowmeter is shipped in a cardboard container filled with shock-absorbing
materials. Open the package carefully and check as follows:
Make sure the following items are included in the package.
For the integral type (when a converter and detector are united)
Electromagnetic flowmeter main unit ------------------------------------------------ 1 unit
Instruction manual --------------------------One each for the converter and detector
For the separate type (when a converter and detector are separated)
Electromagnetic flowmeter converter------------------------------------------------ 1 unit
Electromagnetic flowmeter detector--------------------------------------------------1 unit
Instruction manual -------------------------Once each for the converter and detector
For a converter unit only
Electromagnetic flowmeter converter-------------------------------------------- One unit
Instruction manual --------------------------------------------------One for the converter
Inspect the flowmeter for indications of damage that may have occurred during shipment.
Make sure the type and specifications of the flowmeter are in accordance with the ordered
specifications.
If you cannot find the items listed above or any problem exists, contact your nearest Toshiba
representative.
1.2 Storage
To store the electromagnetic flowmeter after opening the package, select a storing place as follows
and keep it under the conditions described below:
CAUTION
(1) Avoid places where there is direct sunlight, rain or wind.
(2) Store the product in a well-ventilated place. Avoid places of extremely high humidity or
extremely high or low temperature. The following environment is recommended:
•Humidity range: 10 to 90% RH (no condensation)
•Storage temperature: –25 to +65
℃
(3) Avoid places where vibrations or mechanical shock occur.
(4) If it leaves the cover of converter open while being stored, gradual deterioration of circuit
isolation can be caused. And then don’t open the cover until it is connected with wires.
(5) To put the flowmeter temporarily on the floor, place it carefully with something, such as
stopper, to support it so that the flowmeter will not topple over.
LF620*B
LF622*B
LF622*B

－12 －
6 F 8 A 0 9 9 7
2. Overview
This product is a converter used for electric flowmeters that measure the volumetric flow rate of conductive
fluid using Faraday's law of electromagnetic induction.
You can bring out the functions of the converter when you place it in the converter housing you
prepare and use it in combination with a fluid rate measurement detector.
The converter sends out a signal to drive the detector exciting coil, which generates a magnetic field inside
the detector. The converter receives the signal electromotive force obtained by the detector, as signal
electromotive force in proportion to the generated flow rate in the fluid using Faraday's law of
electromagnetic induction. After carrying out operation, the converter converts the signal electromotive
force to an analog signal instrumentation unified signal output and displays the status, as a flow rate value.
Features
With a linear relationship between the flow rate and output signal, the electromagnetic flowmeter is
featured as an easy-to-read indicator. In addition to this feature, it has the following outstanding features:
(1) Wide flow velocity range setting, such as a flow velocity range of 0~0.1 and 0~10m/s, is achieved.
(2) The unique noise filter-out circuit and arithmetic operation processor enables you to obtain a
stable output.
(3) Full graphic electronically rotatable LCD that enables display of a large amount of information
•With a large amount of a maximum of 9 characters x 7 lines, you can easily check various
displays including bar graphs and alarm indications.
•The backlight allows you to read the indicator easily.
(4) Use of infrared switches
•Use of infrared switches allows you to perform various operations, without opening the converter
housing cover.
(5) Intelligent functions
•The widely used HART protocol*1 communications system is used as a standard feature.
•This product supports Modbus*2 communication by option.
* 1 HART protocol: “HART” stands for Highway Addressable Remote Transducer and is a communication protocol
recommended by FieldComm Group for industrial sensors.
“HART” is a registered trademark of FieldComm Group.
*2 Modbus Modbus Protocol is the communication protocol that Modicon Inc. (AEG Schneider Automation
International S.A.S.) developed for PLC
Modbus is a registered trademark of Modicon Inc. (AEG Schneider Automation International S.A.S.).

－13 －
6 F 8 A 0 9 9 7
3. Names of Parts
3.1 Appearance
3.1.1 Appearance of LF620*B Type
Figure 3.1.1 Appearance of LF620*B
Controlkey
(Controlpanel)
Converter
Arrow nameplate
Display section
Cable gland for current
output cable
Converter case
Cable gland for
power cable
Detector
Ground terminal
Converter installation screw
LF620*B

－14 －
6 F 8 A 0 9 9 7
3.1.2 Appearance of LF622*B Type
Figure 3.1.2 Appearance of LF622*B
Converter case
Converter installation screw
Controlkey
(Controlpanel)
Display section
Cable gland for flow rate
signal cable
Cable gland for signal cable
Cable gland for
power cable
Cable gland for
signal cable
Cable gland for
excitation cable
Ground terminal
LF622*B

－15 －
6 F 8 A 0 9 9 7
3.2 Construction of the terminal blocks
3.2.1 Terminal Block Construction of LF620*B Type
When you remove the terminal block cover shown in the figure "Appearance of LF620*B and LF622*B
Type", you can see the converter terminal block as shown below.
CAUTION
The label shown left is placed near
the terminal board
for power supply to this equipment.
Be alert to electric shock.
Figure 3.2.1 Terminal Block Construction of LF620*B and LF622*B
Symbol
Details
L1(+)
Power supply terminal
L2(-)
GND
FG
Internal grounding terminal
AO(+)
Current output terminal
AO(-)
DO1
Digital Output terminal
Or Modbus terminal
*
DO2
DI
Digital Input terminal
Or Modbus terminal
*
COM
Digital I/O common
Or Modbus terminal
*
A
Detector connection terminals
(only used for LF622*B
separate type
converter)
B
G
X
Y
E
Table 3.2.1 Terminal Block Connections
*Available when the optional communication function is
included
LF620*B
LF622*B

－16 －
6 F 8 A 0 9 9 7
4. Installation
Safety Precautions for Installation
CAUTION
Do not use the LF620*B and LF622*B
in an explosive atmosphere.
Use an appropriate device to carry and install
the LF620*B and LF622*B.
DON’T
Using this product in an
explosive atmosphere can
cause explosion.
DO
If his product falls to the ground,
injury, or
malfunction of or damage to the
product, can be caused.
Do not modify or disassemble the
LF620*B and LF622*B
unnecessarily.
Ground the LF620*B and LF622*B
independently from power equipment. (100
ohm or less ground resistance)
DON’T
Modifying or
disassembling this product
can cause electric shock,
malfunction or damage to
this product.
DO
Operating this product without
grounding can cause electric shock
or malfunction.
Do not work on piping and wiring
with wet hands.
Turn off mains power before working on pipes.
DON’T
Wet hands may result in
electric shock
DO
Working on pipes while power is
applied can cause electric shock.
The label shown left is placed near the terminal board for power
supply to the converter.
Be alert to electric shock.

－17 －
6 F 8 A 0 9 9 7
4.1 Notes on Selecting the Installation Location
Do not store or install the flowmeter in :
1. Places within the immediate proximity of equipment producing electrical interference (such as
motors, transformers, radio transmitters, electrolytic cells, or other equipment causing
electromagnetic or electrostatic interference).
2. Where there is direct sunlight.
3. Where excessive vibration or mechanical shock occurs.
4. Where high temperature or high humidity conditions obtain.
5. Where corrosive atmospheres exist.
6. That can be submerged under water.
7. 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. Places of too great an elevation or constricted areas where clearance for installation or
maintenance work is not provided.
9. The standard length of the cable that connects the detector and converter is 30m. Select the
converter installation location so that the distance of the detector and converter will not exceed
30m.
10. Places where there is following factors.
◆Factors to impede infrared switch to operate properly
・Intense light such as direct sunlight and reflected sunlight by window glass or metal plate
・Place where brightness changes suddenly such as lighting being turned ON/OFF
・Dense smoke or steam near the control panel
・Those attached on the control panel such as rain (dew drop), snow, ice, mud and oil, and haze due to
their attachment
・Light reflecting object near the control panel, or reflecting object such as metal plate placed opposing
to the control panel
When any of above factors is considered, take a measure for the proper operation of infrared switch such
as to place a cover or to secure a space for at least a person to stand in front of the control panel.
When unable to avoid above factors, operate the EMF converter removing the factor by covering the
control panel by hand so that light does not shine on it, by cleaning those attached on the control panel,
or by standing in-between the reflecting object and the control panel to block the light.
11. When using generator as a power supply, please power-up after this device after the output of the
generator is stable.
This product is designed for the following environment.
・Indoor and outdoor installation ・Ambient temperature:－20 to ＋60℃
・Altitude:Up to 2000m ・Humidity range:10 to 90%(no condensation)
・Regulation of power voltage:±10%
・Pollution degree 2 ・Structure: IP67(NEMA 4X) (equivalent)
LF622*B

－18 －
6 F 8 A 0 9 9 7
4.2 How to Install
4.2.1 LF620*B Type
The LF620*B type converter is used as one united body. The LF620*B type is not installed by itself.
For how to install the LF620*B type converter and a detector, check the type of the combined detector
and follow the instruction manual for the relevant detector.
4.2.2 LF622*B Type
The LF622*B type can be installed on a wall or to a pipe stand. Install the converter so that the front of
the cover is positioned on the vertical plane. Be sure to install it so that the conduit opening of the
converter will face towards the bottom.
Figure 4.1 shows examples of installation to a panel and wall. Figure 4.2 shows an example of installation
to a pipe stand.
LF620*B
LF622*B

－19 －
6 F 8 A 0 9 9 7
Figure 4.1 Examples of Installation to Panel and Wall
Unit : mm
4-φ11 hole, or M10
Panel or wall mounting dimensions