SMC Networks LFE series User manual

Actual size
56 mm
40 mm
¡Fluctuation of the
displayed value can be
reduced when the close
proximity setting function
is used.
¡Reduced setting time
∗Not available for the remote type
Integrated display type/Remote type Flow range
0.5 L/min 2 L/min 5 L/min 10 L/min 20 L/min 50 L/min 100 L/min 200 L/min
LFE1
LFE1mZ
LFE2
LFE2mZ
LFE3
LFE3mZ
Variations
Rated flow range Display flow range
Rated flow range Display flow range
Rated flow range
Display flow range
340 g
(LFE1m3)
Positive ground
Negative ground
2 types of ground are
available.
An insulated type
has been added.
A close proximity setting is
available.
Compact
The oval fluid
passage
enables the
width to be
reduced.
Water, Water-soluble coolantApplicable fluid
Lightweight
NewNew
CAT.ES100-107D
LFE mSeries
Electromagnetic Digital Flow Switch
3-Color Display RoHS

3-Color Display Electromagnetic Digital Flow Switch LFE mSeries
0
0.01
0.02
0.03
0.04
0.05
50 100
Flow rate
[L/min]
Pressure loss
[MPa]
Reverse flow error (Code LLL)
An insulated type has been added.
Pressure loss: 0.02 MPa or less
Repeatability: ±1.5% F.S.
(Analog output)
Reverse flow can be detected.
A zero-reset setting is available.
Operating fluid
temperature: 0 to 85°C
NewNew
The ground doesn’t need
to be selected when wiring.
Reverse flow error display
The display can be adjusted to zero.
∗Integrated display type only
Negative ground
Positive ground
Ground (0 V)
Ground (0 V)
Ground (0 V)
Negative ground
Positive ground
Ground (0 V)
Ground (−24 V)
Ground (0 V)
Insulation
Insulation
Ground (0 V)
Piping port
Piping port
Electric potential
difference
Short
Piping
24 V
24 V
24 V
24 V
Piping
Ground (0 V)
Negative ground
Positive ground
Ground (0 V)
Ground (0 V)
Ground (0 V)
Negative ground
Positive ground
Ground (0 V)
Ground (−24 V)
Ground (0 V)
Insulation
Insulation
Ground (0 V)
Piping port
Piping port
Electric potential
difference
Short
Piping
24 V
24 V
24 V
24 V
Piping
Ground (0 V)
Reverse flow
Made to Order
Piping connection ports:
Stainless steel 304
Insulated type/LFEmZ
The piping port is insulated
with the power supply.
Non-insulated type/LFEm
The piping port is connected to the
negative ground of the power supply.
p. 19
Marking (Blue)
1

3-Color Display Electromagnetic Digital Flow Switch LFE mSeries
Principle
Flow direction can be
changed after installation.
3-color/2-screen
display
Customer’s
flow direction
Forward direction
(Left to right)
Reverse direction
(Right to left)
IN
OUT
IN
OUT
¡Default flow direction
(Forward direction)
Application Examples
¡Flow direction can be changed after installation.
Instantaneous flow rate is displayed.
The parameters below can be set.
¡Set value ¡Flow direction
¡Accumulated value ¡Line name
¡Peak/Bottom value
Flow control for
pressurized cooling
water for welding guns
Faraday’s law of induction
Measure the volume flow of inductive liquids by applying
Faraday’s law of induction: “when a conductive object is
moved through a magnetic field, an electromotive force will
be generated.”
The electromotive force (E) is proportional to the fluid
velocity (V) multiplied by the magnetic flux density (B). The
volume flow is calculated by converting the measured
electromotive force (E).
An oval fluid passage is used to improve the magnetic flux
density (B) generated by small amounts of current.
Flow control for water-soluble coolant Flow control for cooling water for
metal molds
Electromotive
force (E)
Fluid velocity (V)
Magnetic flux density (B)
Electrode
Coil
Fluid passage/
Piping
Fluid
2

Flow Switch for Fluid Variations
PVC piping
type
∗1 For the remote type monitor unit, only the front side is IP65 compliant. The other parts are IP40 compliant.
Series 2
0 0.5 5 10 20 30 40 50 100 200150 250
Rated flow range [L/min]
Smallest
settable
increment
Detection
method
Enclosure
∗1
Display
Applicable
fluid
Electromagnetic IP65 3-color
display
Water,
Water-soluble
coolant
0.1 L/min
0.5 L/min
1 L/min
LFE
IP65 1-color
display
Deionized
water
(pure water),
Liquids which
do not corrode
nor erode
fluoropolymer
0.05 L/min
0.1 L/min
0.5 L/min
PF2D
Karman
vortex IP65 3-color
display
Water,
Ethylene
glycol
aqueous
solution
0.01 L/min
0.1 L/min
0.1 L/min
1 L/min
2 L/min
PF3W
Karman
vortex
Karman
vortex
IP65 3-color
display
Water,
Ethylene
glycol
aqueous
solution
1 L/min
2 L/min
0.5 20
0.5 4
0.4 4
1.8 20
4 40
2.5 100
10 100
50 250
2 L/min 50 250
10 100
30 250
2 16
5 200
5 40
Karman
vortex IP65 3-color
display
Water,
Ethylene
glycol
aqueous
solution
0.01 L/min
0.1 L/min
0.1 L/min
1 L/min
PF3W-Z 0.5 4
10 100
2 16
5 40
Karman
vortex IP65 3-color
display
IP65 3-color
display
Water,
Ethylene
glycol
aqueous
solution
0.01 L/min
0.1 L/min
0.1 L/min
1 L/min
PF3W-L-Z
Karman
vortex
Water,
Ethylene glycol
aqueous solution
PF3W721-L
0.5 4
10 100
2 16
5 40
3

3-Color Display Electromagnetic
Digital Flow Switch LFE Series
3-Color Display Digital Flow Monitor LFE0 Series
CONTENTS
3-Color Display Electromagnetic Digital Flow Switch LFE Series
How to Order ·································································································································· p. 5
Specifications (Integrated Display Type) ········································································ p. 6
Specifications (Remote Type) ······························································································· p. 7
Flow Rate Characteristics (Pressure Loss) ································································ p. 8
Internal Circuits and Wiring Examples ··········································································· p. 9
Parts Description ······················································································································ p. 10
Fluid Passage Structure ······································································································· p. 10
Dimensions ··································································································································· p. 11
3-Color Display Digital Flow Monitor LFE0 Series
How to Order ······························································································································· p. 12
Specifications (Remote Type Monitor) ········································································ p. 13
Internal Circuits and Wiring Examples ········································································ p. 14
Parts Description (Remote Type Monitor) ································································· p. 15
Dimensions ··································································································································· p. 16
Function Details ······························································································································· p. 17
Made to Order ··································································································································· p. 19
Specific Product Precautions ·································································································· p. 20
Safety Instructions ············································································································ Back cover
4

LFE
Rated flow range
Made to order (Refer to page 19.)
Non-insulated type
LFE
Insulated type
1
1 3 Z A
3A
Integrated display type
Remote type
Non-insulated type Insulated type
Remote type
monitor
Symbol Rated flow range
10.5 to 20 L/min
22.5 to 100 L/min
35 to 200 L/min
Port size
Thread type
Option
How to Order
Output specifications
Symbol OUT1 OUT2 Insulated
type
Non-insulated
type
Integrated
display
type
ANPN NPN V V
BPNP PNP V V
CNPN Analog 1 to 5 V V V
DNPN Analog 4 to 20 mA V V
EPNP Analog 1 to 5 V V—
FPNP Analog 4 to 20 mA V—
Remote
type
J∗1— Analog 1 to 5 V V V
K∗2
— Analog 4 to 20 mA V V
∗1 J: Select when used in combination with a digital flow monitor.
∗2 K: Cannot be used in combination with a digital flow monitor
The piping port is connected to the
negative ground of the power supply.
The piping port is insulated with the
power supply.
RoHS
Electromagnetic Digital Flow Switch
3-Color Display
LFE Series
Options/Part Nos.
When only optional parts are required, order with the part numbers listed below.
Option Part no. Note Weight
Lead wire and M12 connector
LFE-1-A3
Lead wire length 3 m Approx. 175 g
Option Part no. Note Weight
Bracket
LFE-1-D
Tapping screw for LFE1 (3 x 10), 4 pcs. Approx. 45 g
LFE-2-D
Tapping screw for LFE2 (3 x 10), 4 pcs. Approx. 70 g
LFE-3-D
Tapping screw for LFE3 (3 x 10), 4 pcs. Approx. 70 g
Symbol Description
X8
Piping connection ports: Stainless steel 304
Symbol Type
Nil Rc
NNPT
FG
The close proximity setting and zero-reset functions are only
available for the integrated display type.
For the remote type, the close proximity setting and zero-reset
functions cannot be used.
∗1 Options 4, 5, 6, and 7, which are not in SI units, are not for
use in Japan due to the New Measurement Act.
∗2 Options 4, 5, 6, and 7 cannot be selected when the output
specification is J or K.
Reference: 1 [L/min] = 0.2642 [gal/min]
1 [gal/min] = 3.785 [L/min]
Symbol Port size Applicable model
LFE1 LFE2 LFE3
33/8 V— —
41/2 V— —
63/4 — V—
81 — — V
Symbol
Lead wire and M12
connector (Length 3 m)
Bracket Display unit
Nil V— L/min
1— — L/min
2V V L/min
3—VL/min
4∗1∗2V— gal/min
5∗1∗2— — gal/min
6∗1∗2V V gal/min
7∗1∗2—Vgal/min
For details, refer
to page 12.
5

*1 Refer to the “Applicable Fluids List” on page 22.
*2 0 L/min is displayed when the flow is less than the zero-cut flow.
*3 When fluids with high temperatures are used, the operating pressure range and proof pressure will be reduced. (For details, refer to the “Operating
Pressure Range” on page 8.)
*4 It is cleared when the power supply is turned OFF. A hold function can be selected. (Intervals of 2 or 5 minutes can be selected.) If 5-minute intervals
are selected, the life of the memory element (electronic parts) is limited to 1 million times. (If energized for 24 hours, life is calculated as 5 minutes x 1
million = 5 million minutes = about 9.5 years.) Therefore, calculate the number of operations and use within the life.
*5 The delay time until the set value reaches 63% in relation to the step input
*6 The delay time until the set value reaches 63% in relation to the step input
There might be a 0.05 s delay at response times of 0.25 s and 0.5 s due to the timing of internal processing.
*7 The stability of the display and analog output can be improved by increasing the response time of the switch output. (For details, refer to the “Stability”
on page 8.)
*8 When options are used, add the weight of the optional parts.
*9 The enclosure refers to the digital flow switch with a lead wire and M12 connector.
*10 This is the flow range in which the product specifications (accuracy, repeatability, etc.) are satisfied. The correct values may not be displayed when
operated outside of the rated flow range.
Specifications (Integrated Display Type)
Model LFE1 LFE2 LFE3
Applicable fluid*1Water, Conductive fluids which do not corrode the fluid contact materials*1
Applicable fluid conductivity*15 μS/cm or more (micro siemens)
Detection method Electrostatic capacity
Rated flow range*10 0.5 to 20 L/min 2.5 to 100 L/min 5 to 200 L/min
Display flow range 0.4 to 24.0 L/min 2.0 to 120.0 L/min 4 to 240 L/min
Set flow range 0.4 to 24.0 L/min 2.0 to 120.0 L/min 4 to 240 L/min
Zero-cut flow*20.4 L/min 2.0 L/min 4 L/min
Smallest settable increment 0.1 L/min 0.5 L/min 1 L/min
Accumulated volume per pulse (Pulse width: 50 ms) 0.1 L/pulse 0.5 L/pulse 1 L/pulse
Operating fluid temperature *30 to 85°C (No freezing or condensation)
Display units Instantaneous flow rate L/min, Accumulated flow L
Repeatability Displayed values: ±2% F.S. Analog output: ±1.5% F.S.
Temperature
characteristics
Ambient temperature ±5% F.S. (25°C reference)
Fluid temperature ±5% F.S. (25°C reference)
Operating pressure range*30 to 1 MPa
Proof pressure*32 MPa
Accumulated flow range*499999999.9 L 999999999 L
by 0.1 L by 1 L
Switch output NPN or PNP open collector output
Maximum load current 80 mA
Maximum applied voltage 28 VDC
Internal voltage drop NPN: 1 V or less (at load current of 80 mA) PNP: 1.5 V or less (at load current of 80 mA)
Response time*5*7Can be selected from 0.25 s, 0.5 s, 1 s, 2 s, or 5 s
Output protection Short-circuit protection
Output mode
Select from hysteresis mode, window comparator mode, accumulated output mode, or accumulated pulse output mode.
Analog output
Response time*6*7Linked with the switch output
Voltage output Output voltage: 1 to 5 V Output impedance: 1 kΩ
Current output Output current: 4 to 20 mA Max. load impedance: 600 Ω
Hysteresis Variable
Display method 2-screen (Main screen: 4-digit, 7-segment, 2-color, Red/Green; Sub screen: 6-digit, 11-segment, White)
Display values updated 5 times per second
Status LED Output 1, Output 2: Orange
Power supply voltage 24 VDC ±10%
Current consumption LFEm: 45 mA or less/LFEmZ: 60 mA or less (Both not including load current)
Environmental
resistance
Enclosure*9IP65
Operating temperature range 0 to 50°C (No freezing or condensation)
Operating humidity range Operating, Storage: 35 to 85% R.H. (No condensation)
Standards and regulations CE marking (EMC Directive, RoHS Directive)
Fluid contact materials PPS, FKM, Brass
Port size 3/8 (10A) 1/2 (15A) 3/4 (20A) 1 (25A)
Weight (Body)
*8LFEmApprox. 340 g Approx. 400 g Approx. 520 g Approx. 680 g
LFEmZ
For flow switch precautions, refer to the
Operation Manual on the SMC website.
6
3-Color Display Electromagnetic Digital Flow Switch LFE Series

Analog Output
*1 Refer to the “Applicable Fluids List” on page 22.
*2 When fluids with high temperatures are used, the operating pressure range and proof pressure will be reduced. (For details, refer to the “Operating
Pressure Range” on page 8.)
*3 The delay time until the set value reaches 63% in relation to the step input
There might be a 0.05 s delay due to the timing of internal processing.
*4 When options are used, add the weight of the optional parts.
*5 This is the flow range in which the product specifications (accuracy, repeatability, etc.) are satisfied. The correct values may not be displayed when
operated outside of the rated flow range.
*6 The enclosure refers to the digital flow switch with a lead wire and M12 connector.
Specifications (Remote Type) *Refer to page 12 for monitor specifications.
Flow/Analog output
Flow rate
Output
A
C
B
0Min.
rated flow
Max.
rated flow
Outside the range
Model LFE1 LFE2 LFE3
Applicable fluid*1Water, Conductive fluids which do not corrode the fluid contact materials*1
Applicable fluid conductivity*15 μS/cm or more (micro siemens)
Detection method Electrostatic capacity
Rated flow range*50.5 to 20 L/min 2.5 to 100 L/min 5 to 200 L/min
Operating fluid temperature*20 to 85°C (No freezing or condensation)
Repeatability Analog output: ±1.5% F.S.
Temperature
characteristics
Ambient temperature ±5% F.S. (25°C reference)
Fluid temperature ±5% F.S. (25°C reference)
Operating pressure range*20 to 1 MPa
Proof pressure*22 MPa
Analog output
Response time*30.5 s
Voltage output Output voltage: 1 to 5 V Output impedance: 1 kΩ
Current output Output current: 4 to 20 mA Max. load impedance: 600 Ω
Power supply voltage 24 VDC ±10%
Current consumption LFEm: 42 mA or less/LFEmZ: 55 mA or less (Both not including load current)
Environmental
resistance
Enclosure*6IP65
Operating temperature range 0 to 50°C (No freezing or condensation)
Operating humidity range Operating, Storage: 35 to 85% R.H. (No condensation)
Standards and regulations CE marking (EMC Directive, RoHS Directive)
Fluid contact materials PPS, FKM, Brass
Port size 3/8 (10A) 1/2 (15A) 3/4 (20A) 1 (25A)
Weight (Body)
*4LFEmApprox. 335 g Approx. 395 g Approx. 515 g Approx. 675 g
LFEmZ
A B C
Voltage output 1 V 1.1 V 5 V
Current output 4 mA 4.4 mA 20 mA
Model Rated flow [L/min]
Minimum Maximum
LFE1 0.5 20
LFE2 2.5 100
LFE3 5 200
For flow switch precautions, refer to the
Operation Manual on the SMC website.
7
LFE Series

Flow Rate Characteristics (Pressure Loss)
Operating Pressure RangeStability
[mm]
Straight Piping Length and Accuracy (Reference Value)
•The smaller the piping size, the more the product
is affected by the straight piping length.
The straight piping length should be 5 times (5D)
or more the piping size to achieve the stable
measurement.
*Stability indicates the fluctuation width of the display or analog output.
When fluids with high temperature are used,
the operating pressure range will be reduced.
Operate within the range mentioned above. The
proof pressure is double the operating pressure
range.
*Stability is improved by increasing the response time setting.
±0
±0.5
±1.0
±1.5
±2.0
±2.5
±3.0
±3.5
±4.0
Response time [s]
Stability [% F.S.]
0.25 0.5 1 2 5
1.1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
00 10 20 30 40 50 60 70 80 90
Fluid temperature [°C]
Pressure [MPa]
Operating range
LFE1 LFE2 LFE3
Flow rate [L/min]
Pressure loss [MPa]
Flow rate [L/min]
Pressure loss [MPa]
Flow rate [L/min]
Pressure loss [MPa]
0
0.005
0.01
0.015
0.02
0 50 100 150 200
0
0.005
0.01
0.015
0.02
0 5 10 15 20
0
0.005
0.01
0.015
0.02
0 20 40 60 80 100
[Measurement conditions]
Fluid: Tap water
Pressure: 0.2 MPa 0 D 2D 3D 4D 5D
Straight piping length
Accuracy change [% F.S.]
Accuracy change
Straight piping
length
[Port size]
LFE1: 3/8 inch
LFE2: 3/4 inch
LFE3: 1 inch
3
2
1
0
Straight piping
length
Model
Straight piping length
D 5D
LFE1 11 55
LFE2 21 105
LFE3 27 135
8
3-Color Display Electromagnetic Digital Flow Switch LFE Series

Brown DC (+)
Black OUT1
White Analog output
Blue DC (−)
24 VDC
Max. 80 mA
Internal voltage drop 1.5 V or less
E: Analog output 1 to 5 V
Output impedance 1 kΩ
F: Analog output 4 to 20 mA
Load impedance 50 to 600
Ω
Load
Load
Main circuit
Accumulated pulse output wiring examples
Internal Circuits and Wiring Examples (Integrated Display Type)
NPN 2 output type
LFElAlll(Z)
NPN 2 output type
LFElAlll(Z)
NPN + Analog output type
LFElClll(Z)/LFElDlll(Z)
PNP 2 output type
LFElBlll(Z)
PNP + Analog output type
LFEmEmmmZ/LFEmFmmmZ
PNP 2 output type
LFElBlll(Z)
*OUT2 is available for 2 output types (A or B).
When accumulated pulse output is selected, the indicator light will be OFF.
Internal Circuits and Wiring Examples (Remote Type)
Analog voltage output type
LFEmJmmm(Z)
Analog current output type
LFEmKmmm(Z)
Brown DC (+)
Black OUT1
White OUT2
Blue DC (−)
24 VDC
Load
Load
Main circuit
Max. 28 V, 80 mA
Internal voltage drop 1 V or less
24 VDC
Brown DC (+)
Black OUT1
White OUT2
Blue DC (−)
Load
Load
Main circuit
Max. 80 mA
Internal voltage drop 1.5 V or less
Brown DC (+)
Black OUT1
Blue DC (−)
24 VDC
White Analog output
Load
Load
Main circuit
Max. 28 V, 80 mA
Internal voltage drop 1 V or less
C: Analog output 1 to 5 V
Output impedance 1 kΩ
D: Analog output 4 to 20 mA
Load impedance 50 to 600 Ω
50 ms
0 V
50 m
s
or
Black OUT1
White OUT2
Blue DC (−)
Load
Load
Max. 28 V, 80 mA
Max. 80 mA
Brown DC (+)
Black OUT1
White OUT2
Load
Load
50 ms
0 V
50 ms
or
Brown DC (+)
N.C.
Blue DC (−)
24 VDC
White Analog output
Load
Main circuit
∗
Do not connect anything to N.C.
NPN + Analog output type
LFEmCmmm(Z)/LFEmDmmm(Z)
PNP + Analog output type
LFEmEmmmZ/LFEmFmmmZ
*For both the remote type and the integrated display type, the output part of the insulated type is insulated with the main circuit.
9
LFE Series

DOWN button
SET button
UP button
Main screen
(2-color display)
Output display
(Status LED)
Sub screen Unit display
q
r
w
ee
w
r
Parts Description
Fluid Passage Structure
Body
Display
Display
Lead wire and M12 connector
(4 pins)
P
iping port
Connector
P
iping port
Bracket
(Option)
Description Function
Connector
Allows for power supply connection by connecting to the
lead wire with M12 connector and performs output
according to the flow rate
Lead wire and
M12 connector The enclosure becomes IP65 when fit with a connector.
Piping port For piping connections
Display Displays the flow, set values, and error information
Bracket Mounting bracket for installing the product
Description Function
Main screen (2-color display) Displays the flow value, setting mode, and error codes
Sub screen Displays the accumulated flow, peak/bottom value, flow direction, and
various setting values (For details, refer to page 17.)
Output display (Status LED)
Displays the output condition of OUT1 and OUT2 (When ON:
Orange light turns on)
UP/DOWN button
Changes the selected items and increases or decreases the set value
SET button Makes changes in each mode and enters the set value
Unit display Indicates the unit currently selected
No. Description Material
1 Pipe PPS
2 O-ring FKM
3 Attachment Brass
4 Spacer FKM
10
3-Color Display Electromagnetic Digital Flow Switch LFE Series

(45)
(30)
(31)
(25)
(31)
(24)
Brown
White
Blue
Black
ø15
3: Blue
2: White
M12
1
: Brown
4: Black
ø6
(3000)
Dimensions
Cable Specifications
Integrated display type LFE1/2/3(Z)
Lead wire and M12 connector
*If you are installing directly, choose a self-tapping screw with a screw-in depth of 8 mm. Tighten the screw with a torque of 0.7 to 0.8 N·m.
Without bracket (Bottom view)
Bracket thickness is approx. 1.6 mm
4 x O
L
K
M
N
QP
∗1 For the integrated display type
∗Dimensions are the same as those of the integrated display type.
∗
The electrical entry for the lead wire and M12 connector does
not rotate and is limited to only one entry direction.
IN OUT
A
(U) (U)
B
Remote type LFE1/2/3(Z)
Width across flats
H
2 x Port size
I
J
C
D
E
F
G
1.4∗1
4 x T
R
S
Model Port size
A B C D E F G H I J K L M N O P Q R S T U
LFE1l3l3/8 90 73 40 23.5 56 83 89 24 6 1.6 96 87 48 39 4.6 12 11.5 52 28
ø2.5 depth 8.5 2
LFE1l4l1/2 104 73 40 23.5 56 83 89 28 6 1.6 96 87 48 39 4.6 12 11.5 52 28
ø2.5 depth 8.5 2
LFE2l3/4 105 78 50 29 67 94 100 35 6 1.6 115 106 62 53 4.6 9.5 14 56 38
ø2.5 depth 8.5 2.6
LFE3l1 120 90 55 32 73 100 106 41 6 1.6 115 106 62 53 4.6 3.5 20 68 43
ø2.5 depth 8.5 2.6
Pin no. Pin description Wire color
1DC (+) Brown
2OUT 2 White
3DC (−) Blue
4OUT 1
Black
Conductor
Nominal cross section area AWG21
External diameter Approx. 0.9 mm
Insulator
Material Non-lead heat resistant PVC
External diameter Approx. 1.7 mm
Colors
Brown, White, Black, Blue
Sheath Material Non-lead heat and oil resistant PVC
Finished external diameter ø6
11
LFE Series

LFE A0
Type
*When using the remote type, select
LFEmJmmm(Z) with an analog output
of 1 to 5 V.
*Does not support the close proximity
setting/zero-reset functions
Output specifications
The lead wire is shipped together with the product.
Lead wire
The connector is shipped together with the product.
Option 2
Option 1
Options/Part Nos.
When only optional parts are required, order with the part numbers listed below.
Remote type monitor/Display unit
M V C
How to Order
Digital Flow Monitor
3-Color Display
LFE0 Series
RoHS
Power supply/output connection lead wire
ZS-40-W
Sensor connector
(e-con)
Panel mount adapter
Mounting screw (M3 x 8 L)
(Accessory)
Waterproof seal
(Accessory)
Panel
Waterproof seal
(Accessory)
Mounting screw (M3 x 8 L)
(Accessory)
Panel mount adapter
Front protective cover
Panel
0Remote type monitor
Symbol OUT1 OUT2
ANPN NPN
BPNP PNP
CNPN Analog 1 to 5 V
DNPN Analog 4 to 20 mA
Nil
With power supply/output connection lead wire (2 m)
N
Without power supply/output connection lead wire
Symbol Instantaneous flow rate Accumulated flow
ML/min L
Ggal/min gal
Nil Without connector
C
Sensor connector (1 pc.)
Nil None
T
Panel mount adapter
V
Front protective cover + Panel mount adapter
Description Part no. Note
Panel mount adapter ZS-26-B With waterproof seal, mounting screw
Front protective cover + Panel mount adapter
ZS-26-C With waterproof seal, mounting screw
Front protective cover only ZS-26-01 Separately order panel mount adapter, etc.
Power supply/output connection lead wire ZS-40-W Lead wire length 2 m
Sensor connector (e-con) ZS-28-C-5 1 pc.
Lead wire with connector for copying ZS-40-Y Connect up to 10 slave units
*Under the New Measurement Act, units other
than SI (symbol “M”) cannot be used in Japan.
*G: Made to order
Reference: 1 [L/min] 0.2642 [gal/min]
1 [gal/min] 3.785 [L/min]
12

Specifications (Remote Type Monitor)
*1 It is cleared when the power supply is turned OFF. A hold function can be selected. (Intervals of 2 or 5 minutes can be selected.) If 5-minute intervals
are selected, the life of the memory element (electronic parts) is limited to 1 million times. (If energized for 24 hours, life is calculated as 5 minutes x 1
million = 5 million minutes = about 9.5 years.) Therefore, calculate the number of operations and use within the life.
*2 The delay time until the set value reaches 63% in relation to the step input
*3 The delay time until the set value reaches 63% in relation to the step input
Analog Output
Flow/Analog output
0
Output
Min.
rated flow
Max.
rated flow
Flow rate
A
C
B
Outside the range
Model LFE0
Display flow range 0.4 to 24.0 L/min
(Flow under 0.4 L/min is displayed as “0.0”)
2.0 to 120.0 L/min
(Flow under 2.0 L/min is displayed as “0.0”)
4 to 240 L/min
(Flow under 4 L/min is displayed as “0.0”)
Set flow range 0.4 to 24.0 L/min 2.0 to 120.0 L/min 4 to 240 L/min
Smallest settable increment 0.1 L/min 0.5 L/min 1 L/min
Accumulated volume per pulse 0.1 L/pulse 0.5 L/pulse 1 L/pulse
Display units Instantaneous flow rate L/min, Accumulated flow L
Accuracy Displayed values: ±0.5% F.S., Analog output: ±0.5% F.S.
Repeatability ±0.5% F.S.
Temperature characteristics ±0.5% F.S. (25°C reference)
Accumulated flow range*199999999.9 L 999999999 L
by 0.1 L by 1 L
Switch output NPN or PNP open collector output
Maximum load current 80 mA
Maximum applied voltage 28 VDC
Internal voltage drop NPN: 1 V or less (at load current of 80 mA) PNP: 1.5 V or less (at load current of 80 mA)
Response time
*2Can be selected from 0.5 s, 1 s, 2 s, or 5 s
Output protection Short-circuit protection
Output
mode
Flow rate Select from hysteresis mode, window comparator mode, accumulated output mode, or accumulated pulse output mode.
Temperature Select from hysteresis mode or window comparator mode.
Analog output
Response time
*3Linked with the switch output
Voltage output Output voltage: 1 to 5 V Output impedance: 1 kΩ
Current output Output current: 4 to 20 mA Max. load impedance: 600 Ω
Hysteresis Variable
Input/output Input for copy mode
Display method
2-screen (Main screen: 4-digit, 7-segment, 2-color, Red/Green; Sub screen: 6-digit, 11-segment, White) Display values updated 5 times per second
Status LED Output 1, Output 2: Orange
Power supply voltage 24 VDC ±10%
Current consumption 50 mA or less
Connection Power supply output 5P connector, sensor connection 4P connector (e-con)
Environmental
resistance
Enclosure
IP40 (Only front face of the panel is IP65 when optional panel mount adapter and waterproof seal are used.)
Operating temperature range 0 to 50°C (No freezing or condensation)
Operating humidity range Operating, Storage: 35 to 85% R.H. (No condensation)
Withstand voltage 1000 VAC for 1 minute between terminals and housing
Insulation resistance 50 MΩor more (500 VDC measured via megohmmeter) between terminals and housing
Standards and regulations CE marking (EMC Directive, RoHS Directive)
Weight
Without power supply/output
connection lead wire
50 g
With power supply/output
connection lead wire
100 g
A B C
Voltage output 1 V 1.1 V 5 V
Current output 4 mA 4.4 mA 20 mA
Connected
sensor
Rated flow [L/min]
Minimum Maximum
LFE1 0.5 20
LFE2 2.5 100
LFE3 5 200
For flow switch precautions, refer to the
Operation Manual on the SMC website.
13
LFE0 Series

24 VDC
Load
Load
Blue DC (−)
Gray COPY
White Analog output
Black OUT1
Brown DC (+)
LFE0C LFEJ
eBlue DC (−)
wN.C.
r
White 1 to 5 V (Flow value)
qBrown DC (+)
Main circuit Main circuit
Connection example of LFE0C and LFEmJ
Internal Circuits and Wiring Examples
NPN + Analog output type
LFE0C
NPN + Analog output type
LFE0D
PNP 2 output type
LFE0B
Sensor input circuit
Accumulated pulse output wiring examples
NPN 2 output type
LFE0A
NPN + Analog output type
LFE0C/LFE0D
PNP 2 output type
LFE0B
*When accumulated pulse output is selected, the indicator light will be OFF.
Brown DC (+)
Black OUT1
White OUT2
Blue DC (−)
24 VDC
Load
Load
Gray COPY
NPN 2 output type
LFE0A
Main circuit
24 VDC
Brown DC (+)
Black OUT1
White OUT2
Gray COPY
Blue DC (−)
Load
Load
Main circuit
Brown DC (+)
Black OUT1
Blue DC (−)
24 VDC
White Analog output
Gray COPY
Load
Load
Main circuit
q
w
e
r
DC (+) Brown
N.C.
DC (−) Blue
1 to 5 V (Flow value) White
Main circuit
∗Do not connect anything to N.C.
50 ms
0 V
50 ms
or
Black OUT1
White OUT2 (LFE0A only)
Blue DC (−)
Load
Load
Brown DC (+)
Black OUT1
White OUT2
Load
Load
50 ms
0 V
50 ms
or
14
3-Color Display Digital Flow Monitor LFE0 Series

Parts Description (Remote Type Monitor)
Sensor connector
Power supply/output connection lead wire
Cable Specifications
*1 When using the lead wire and M12 connector included with the LFElJ series
Do not connect black.
Sensor connector
Power supply/output connection lead wire
Main screen (2-color display)
Output display
(Status LED)
Sub screen
UP button SET button DOWN button
Unit display
1234
r
q
e
w
1
2
3
4
5
Pin no.
Gray COPY
White OUT2
Black OUT1
Blue DC(−)
Brown DC(+)
2000
Description Function
Main screen (2-color display) Displays the flow value, setting mode, and error codes
Sub screen Displays the accumulated flow, peak/bottom value, flow direction,
and various setting values (For details, refer to page 17.)
Output display (Status LED) Displays the output condition of OUT1 and OUT2. (When ON: Orange light turns on)
UP/DOWN button Changes the selected items and increases or decreases the set value
SET button Makes changes in each mode and enters the set value
Unit display Indicates the unit currently selected
Pin no. Terminal Connector no. Lead wire color *1
qDC (+) 1 Brown
wN.C./IN 2 Not used
eDC (−) 3 Blue
rINPUT 4 White (Flow sensor 1 to 5 V input)
Conductor
Nominal cross section area AWG26
External diameter Approx. 0.5 mm
Insulator
Material Cross-linked vinyl
External diameter Approx. 1.0 mm
Colors
Brown, Blue, Black, White, Gray
Sheath Material Oil and heat resistant vinyl
Finished external diameter ø3.5
15
LFE0 Series

Panel fitting dimensions
Applicable panel thickness:
0.5 to 8 mm (Without waterproof seal)
0.5 to 6 mm (With waterproof seal)
Front protective cover + Panel mount adapter
Dimensions
NC/IN
40.1 (7.5)
2.5
36.8
6
40
40
Power supply/output connector (5P)
Sensor connector (4P)
Front protective cover
Waterproof seal
Panel
Panel mount adapter
47
42.4
(2)
9.4
46.4
53
37.5 +0.1
−0.2
37.5 +0.1
−0.2
48 or more
55 or more
4 x R1 or less
16
3-Color Display Digital Flow Monitor LFE0 Series

No. Display
1
ON: Green, OFF: Red
2
ON: Red, OFF: Green
3Normally: Red
4Normally: Green
Display color
The display color can be selected for each
output condition. The selection of the dis-
play color provides visual identification of
abnormal values. (The display color de-
pends on OUT1 settings.)
Response time
The response time can be selected according to
the application. (The default setting is 1 second.)
The fluctuation of the displayed value can be re-
duced by setting a longer response time. If you
need faster detection of problems such as leak-
age of tip cooling water for welding guns, switch
output or analog output can be made faster by
setting a shorter response time. In this case,
widen the hysteresis to prevent the chattering of
the switch output.
Output operation
The output operation can be selected from the following:
Output (hysteresis mode and window comparator mode) correspond-
ing to instantaneous flow or output (accumulated output and accumu-
lated pulse output) corresponding to accumulated flow.
*At the time of shipment from the factory, it is set to hysteresis mode.
Forced output
Forcing output to ON/OFF during system startup or maintenance can
prevent system errors from occurring when checking the wiring and
output.
For the analog output type, the output will be 5 V or 20 mA for ON
and 1 V or 4 mA for OFF.
*Forced output takes precedence regardless of the increase or decrease
in flow rate.
Accumulated value hold
The accumulated flow value can be retained even when the power
supply is shut off. It can be stored at intervals of 2 or 5 minutes during
measurement. The number of times the memory element can be
accessed is 1 million times. Take this into consideration before use.
 Switching of flow direction (*Integrated display type only)
The flow direction can be changed after installation.
Sub screen display
The display on the sub screen in measuring mode can be set.
LFE Series
Function Details
Forward direction
(Left to right)
Reverse direction
(Right to left)
Sub screen
Integrated display type Remote type monitor unit
Displays the set value
(The set value of OUT2 cannot be displayed.)
Set value display
Displays the accumulated value
(The accumulated value of OUT2 cannot be displayed.)
Displays the peak value Displays the bottom value
Accumulated value display Peak value display Bottom value display
Displays the line name
(Up to 6 alphanumeric characters can be input.)
Line name display
Displays the flow direction
(When the close proximity setting function is
being used, the set value is also displayed.)
Flow direction display
(∗Integrated display type only)
Displays nothing
Off
Response time Stability
0.25 seconds
±3.7% F.S.
0.5 seconds
±2.5% F.S.
1 second
±1.7% F.S.
2 seconds
±1.2% F.S.
5 seconds
±0.8% F.S.
17

Forward direction flow
+ + +
+
Initial value Setting 1 Setting 2 Setting 3
MAnalog output free range
This is available for all analog output compatible products. The max.
value of analog output can be any flow rate value within the rated range.
MSecurity code requests
During keylock release, you can request the input of a security code.
By default, security code requests are disabled.
MKeylock
The keylock function prevents operation errors such as accidentally
changing setting values.
If the error cannot be solved after the above instructions are performed, please contact SMC for investigation.
MZero-reset (*Integrated display type only)
Enables the display to be adjusted to zero
Display Error name Description Action
OUT1 over current error A load current of 80 mA or more is applied to the
switch output (OUT1). Eliminate the cause of the over current by
turning off the power supply and then turning it
on again.
OUT2 over current error A load current of 80 mA or more is applied to the
switch output (OUT2).
Zero-reset error
The detection passage is not filled or the flow rate
exceeds ±20% F.S. of the rated flow rate during
zero-reset setting.
When there is no flow, and the detection
passage is full, operate the unit.
Instantaneous flow error The flow rate has exceeded the display flow range. Use the product within the rated range.
Reverse flow error Flow is flowing in the reverse direction of the setting. Change the setting of the flow direction.
( )
Alternately displays
[999] and [999999]
Accumulated flow error The flow rate exceeds the accumulated flow rate
range.
Clear the accumulated flow rate.
(This error is irrelevant when accumulated flow
is not being used.)
System error Internal data error Shut off the power and then on again.
Power supply voltage error The power supply voltage exceeds 24 V ±10%. Adjust the power supply voltage and then turn
the power on again.
MError display
When an error or abnormality arises, the location and contents are displayed.
MClose proximity setting (*Integrated display type only)
By activating the close proximity setting function, flickering of the
display in the uninstallable area can be reduced.
In cases where “Flow direction display” is displayed on the sub screen,
the close proximity setting function can be activated by pressing the
and buttons simultaneously for at least one second.
MPower-saving mode
The display can be turned off to reduce power consumption (by ap-
prox.10%). In power-saving mode, only decimal points blink. If any
button is pressed during power-saving mode, the display is recovered
for 30 seconds to check the flow, etc.
MPeak/Bottom value display
The maximum (minimum) flow rate is detected and updated from
when the power supply is turned on. In peak (bottom) value display
mode, this maximum (minimum) flow rate is displayed.
18
Function Details LFE Series

S
Bracket thickness is approx. 1.6 mm
4xO
∗The electrical entry for the lead wire and M12 connector does
not rotate and is limited to only one entry direction.
∗1 For the integrated display type
∗Dimensions are the same as those
of the integrated display type.
Without bracket (Bottom view)
Remote type LFE1/2/3(Z)-X8
2 x Port size
1.4∗1
4x
T
OUTIN
R
A
B
(U)(U)
P Q
M
N
L
K
G
F
E
D
H C
J
I
q
w
ewe
r r
Other specifications not listed (excluding the NPT thread type) are the same as
those of the standard model.
LFE Series
Made to Order
Please consult with SMC for detailed specifications, delivery times, and prices.
1Piping connection ports: Stainless steel 304 -X8
Symbol
*1 When options are used, add the weight of the optional parts.
Model LFE1-X8 LFE2-X8 LFE3-X8
Fluid contact materials PPS, FKM, Stainless steel 304
Port size 3/8 (10A) 1/2 (15A) 3/4 (20A) 1 (25A)
Weight (Body)
*1
Integrated display type
(Insulated type/Non-insulated type)
Approx. 380 g Approx. 430 g Approx. 620 g Approx. 800 g
Remote type
(Insulated type/Non-insulated type)
Approx. 375 g Approx. 425 g Approx. 615 g Approx. 795 g
Dimensions
Fluid Passage Structure
Integrated display type LFE1/2/3(Z)-X8
Specifications
*If you are installing directly, choose a self-tapping screw with a screw-in depth of 8 mm. Tighten the screw with a torque of 0.7 to 0.8 N·m.
Model Port size
A B C D E F G H I J K L M N O P Q R S T U
LFE133/8 90 73 40 23.5 56 83 89 30 6 1.6 96 87 48 39 4.6 12 11.5 52 28 ø2.5 depth 8.5 2
LFE141/2 104 73 40 23.5 56 83 89 30 6 1.6 96 87 48 39 4.6 12 11.5 52 28 ø2.5 depth 8.5 2
LFE23/4 105 78 50 29 67 94 100 41 6 1.6 115 106 62 53 4.6 9.5 14 56 38 ø2.5 depth 8.5 2.6
LFE31 120 90 55 32 73 100 106 46 6 1.6 115 106 62 53 4.6 3.5 20 68 43 ø2.5 depth 8.5 2.6
No. Description Material
1 Pipe PPS
2 O-ring FKM
3 Attachment Stainless steel 304
4 Spacer FKM
19