SMC Networks LFE series User manual


Applicable fluids: Water, Water-soluble coolant

Compact/Lightweight

Reverse flow can be detected.
Reverse flow error display
Weight: 340 g (LFE13)

Operating fluid temperature: 0to 85°C

Current consumption: 45 mA
Reduced by up to 10% when the display is off.
90 mm
Reverse flow error (Code LLL)
Oval fluid passage reduced product width
Integrated display type
RoHS IP65
Variations
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
LFE2
LFE3
Rated flow range
Rated flow range
Display flow range
Display flow range
Rated flow range
Display flow range
40 mm
56 mm
Reverse flow
Monitor unit
Sensor unit
3-color display
Remote type
(Refer to page 365.)
(Refer to page 379.)
LFE Series
3-Color Display Electromagnetic Type Digital Flow Switch
359
PFM
PFMV
PFMB
PFMC
PF2A
PF3W
PF2D
LFE
IF
LFE

3-color/2-screen display
Flow control for water-soluble coolant Flow control for cooling water for metal mold Flow control for pressurized cooling water for welding gun
Default flow direction (Normal flow)
Instantaneous
flow rate is displayed.
Parameters below can be set.
Flow direction can be changed after installation.
Customer’s
flow direction
Normal flow (Left to right) Reverse flow (Right to left)
Application Examples

Flow direction can be changed after installation.
Measure the volume flow of inductive liquid by applying the Faraday’s law
of induction “when conductive object is moved through a magnetic field,
electromotive force will be generated.”
Electromotive force (E) is proportional to fluid velocity (V) multiplied by magnetic flux density (B).
Volume flow is calculated by converting measured electromotive force (E).
Oval fluid passage is used to improve the magnetic flux density by small amount of current.
Principle
Electrode
Electromotive force (E)
Fluid passage/Piping
Magnetic flux density (B)
Fluid velocity (V)
Fluid
Coil
Faraday’s law of induction
3-color/2-screen display

IN
OUT
IN
OUT
LFE  Series
¡Set value ¡Flow direction
¡Accumulated value ¡Line name
¡Peak/Bottom value
Electromagnetic Type Digital Flow Switch

Pressure loss:
0.02 MPa or less
Repeatability: ±1.5 % F.S. (Analog output)
360

Flow Switch for Liquid Variations
PVC piping
type
∗For remote type monitor unit, only the front side is IP65 compliant. Other parts are IP40 compliant.
Series 2
0 0.5 5 10 20 30 40 50 100 200150 250
Rated flow range [L/min]
Minimum
setting unit
Detection
method
Enclosure
∗Display
Applicable
fluid
Electromagnetic
type
IP65 3-color
display
Water/
Water-soluble
coolant
0.1 L/min
0.5 L/min
1 L/min
IP65 1-color
display
Deionized water
and
Chemicals
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
10 100
30 250
2 16
5 200
5 40
3-Color Display Electromagnetic Type Digital Flow Switch
LFE Series
How to Order P.362
Specifications (Integrated Display Type)P.363
Specifications
(Remote Type Sensor Unit) P.364
Flow Rate Characteristics (Pressure Loss) P.365
Internal Circuits and Wiring Examples P.366
Parts Description P.367
Dimensions P.368
3-Color Display Digital Flow Monitor
LFE0 Series
How to Order P.369
Specifications P.370
Internal Circuits and Wiring Examples P.371
Parts Description (Remote Type Monitor Unit) P.372
Dimensions P.373
Function Details P.374
Specific Product Precautions P.377
INDEX
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····
···
·······································
·····················
····
LFE
361
PFM
PFMV
PFMB
PFMC
PF2A
PF3W
PF2D
LFE
IF
LFE

Option/Part No.
When only optional parts are required, order with the part number listed below.
Part no. Weight NoteOption
LFE-1-A3 Approx. 175 g Lead wire length 3 m
Lead wire with M12 connector
LFE
Rated flow range
Integrated display type
Output specifications
Output specifications
Analog 1 to 5 V
Analog 4 to 20 mA
OUT
Symbol
J
K
Symbol OUT1 OUT2
A
B
C
D
NPN
PNP
Analog 1 to 5 V
Analog 4 to 20 mA
NPN
PNP
NPN
NPN
0.5 to 20 L/min
2.5 to 100 L/min
5 to 200 L/min
Symbol
1
2
3
Rated flow range
Electromagnetic Type Digital Flow Switch
3-color display
LFE
Remote type sensor unit
Thread type
Symbol
Nil
N
F
Type
Rc
NPT
G
Port size
Symbol Port size Applicable model
3
4
6
8
LFE1


—
—
—
—

—
—
—
—

LFE2 LFE3
3/8
1/2
3/4
1
1
1 3J
3A
How to Order
RoHS
Option
Symbol
Nil
1
2
3
4∗
5∗
6∗
7∗
Lead wire with M12
connector (Length 3 m)

—

—

—

—
Bracket
—
—


—
—


L/min
L/min
L/min
L/min
gal/min
gal/min
gal/min
gal/min
∗Option 4, 5, 6, 7 which are not SI units are not for
use in Japan due to a new measurement law.
∗Option 4, 5, 6, 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]
LFE Series
Unit
specifications
Option
Bracket
Part no. Note
Tapping screw for LFE1 (3 x 10), 4 pcs.
Tapping screw for LFE2 (3 x 10), 4 pcs.
Tapping screw for LFE3 (3 x 10), 4 pcs.
LFE-1-D
LFE-2-D
LFE-3-D
Weight
Approx. 45 g
Approx. 70 g
Approx. 70 g
Integrated
display type
Remote type
sensor unit
Remote type
monitor unit
For details, refer
to page 369.
362

Note 1) Refer to “Applicable Fluids List” on page 379.
Note 2) 0 L/min is displayed when the flow is less than zero-cut flow.
Note 3)
When fluids with high temperature are used, the operating pressure range and proof pressure will be reduced. (For details, refer to “Operating Pressure Range” on page 365.)
Note 4) Cleared when the power supply is turned off. Hold function can be selected. (Interval of 2 or 5 minutes can be selected.) If the 5 minutes interval is selected,
the life of the memory element (electronic parts) is limited to 1 million cycles. (If energized for 24 hours, life is calculated as 5 minutes x 1 million = 5 million
minutes = about 9.5 years.) Therefore, if using the hold function, calculate the memory life for your operating conditions, and use within this life.
Note 5) The response time when the set value is 63% in relation to the step input.
Note 6) The response time until the set value reaches 63% in relation to the step input. There might be a 0.05 seconds delay at response time of 0.25 s or
0.5 s due to the timing of internal processing.
Note 7) The stability of display and analog output is improved by increasing the response time setting. (For details, refer to “Stability” on page 365.)
Note 8) When options are used, add the weight of the optional parts.
Note 9) Enclosure is for digital flow switch with lead wire and M12 connector.
Note 10) Piping port is grounded to DC(–)/blue line. Power supply with positive ground cannot be used. (Refer to Figure 1.)
Please consult SMC if the product is used for positive ground environment.
Note 11) The rated flow range is a flow range in which the product specifications (accuracy and repeatability) of the sensor are satisfied. The correct flow
value may not be indicated outside the flow range.
Model LFE1 LFE2 LFE3
Applicable fluid Note 1)
Applicable fluid conductivity Note 1)
Detection method
Ground Note 10)
Rated flow range Note 11)
Display flow range
Set flow range
Zero-cut flow Note 2)
Minimum setting unit
Accumulated volume per pulse (Pulse width: 50 ms)
Operating fluid temperature Note 3)
Display units
Repeatability
Operating pressure range Note 3)
Proof pressure Note 3)
Accumulated flow range Note 4)
Switch output
Analog output
Hysteresis
Display method
Status LED’s
Power supply voltage
Current consumption
Standards and regulations
Parts material in contact with fluid
Port size
Weight (Body) Note 8)
Maximum load current
Maximum applied voltage
Internal voltage drop
Response time Note 5) 7)
Output protection
Output mode
Response time Note 6) 7)
Voltage output
Current output
Enclosure Note 9)
Operating temperature range
Operating humidity range
Ambient temperature
Fluid temperature
Temperature
characteristics
Environmental
resistance
Water, Conductive fluids which do not corrode the fluid contact materials. Note 1)
5 µS/cm or more (micro siemens)
Electrostatic capacity type
Negative ground
0 to 85°C (with no freezing and condensation)
Instantaneous flow rate L/min, Accumulated flow L
Displayed values: ±2% F.S. Analog output: ±1.5% F.S.
±5% F.S. (25°C reference)
±5% F.S. (25°C reference)
0 to 1 MPa
2 MPa
NPN or PNP open collector output
80 mA
28 VDC
NPN: 1 V or less (at load current 80 mA) PNP: 1.5 V or less (at load current 80 mA)
0.25 s/0.5 s/1 s/2 s/5 s
Short-circuit protection
Select from hysteresis mode, window comparator mode, accumulated output mode, or accumulated pulse output mode.
0.25 s/0.5 s/1 s/2 s/5 s
Output voltage: 1 to 5 V Output impedance: 1 kΩ
Output current: 4 to 20 mA Max. load impedance: 600 Ω
Variable
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
Output 1, Output 2: (Orange)
24 VDC ±10%
45 mA or less (Load current is not included.)
IP65
0 to 50°C(with no freezing and condensation)
Operating, Storage: 35 to 85% R.H. (with no condensation)
CE marking, RoHS
PPS, FKM, Brass
2.5 to 100 L/min
2.0 to 120.0 L/min
2.0 to 120.0 L/min
2.0 L/min
0.5 L/min
0.5 L/pulse
5 to 200 L/min
4 to 240 L/min
4 to 240 L/min
4 L/min
1 L/min
1 L/pulse
0.5 to 20 L/min
0.4 to 24.0 L/min
0.4 to 24.0 L/min
0.4 L/min
0.1 L/min
0.1 L/pulse
999999999 L
by 1 L
99999999.9 L
by 0.1 L
3/8 (10A)
Approx. 340 g
3/4 (20A)
Approx. 520 g
1 (25A)
Approx. 680 g
1/2 (15A)
Approx. 400 g
Specifications (Integrated Display Type)
DC (+)
DC (−) DC (+)
DC (+)
DC (−) DC (−) part is connected to DC (–).part is connected to DC (–).
If used with power supply with positive ground,
the metal part shorts.
Piping Piping
Figure 1
363
Electromagnetic Type Digital Flow Switch LFE Series
3-color display
PFM
PFMV
PFMB
PFMC
PF2A
PF3W
PF2D
LFE
IF
LFE
A

Analog Output
Note 1) Refer to “Applicable Fluids List” on page 379.
Note 2) When fluids with high temperature are used, the available pressure range will be reduced. (For details, refer to “Operating Pressure Range” on page 365.)
Note 3) The response time until the set value reaches 63% in relation to the step input.
Note 4) When options are used, add the weight of the optional parts.
Note 5) Piping port and the metal part of the body are grounded to DC(–)/blue line. Power supply with positive ground cannot be used. Please consult SMC
if the product is used for positive ground environment.
Note 6) The rated flow range is a flow range in which the product specifications (accuracy and repeatability) of the sensor are satisfied. The correct flow
value may not be indicated outside the flow range.
Model LFE1 LFE2 LFE3
Applicable fluid Note 1)
Applicable fluid conductivity Note 1)
Detection method
Ground Note 5)
Rated flow range Note 6)
Operating fluid temperature Note 2)
Repeatability
Temperature
characteristics
Operating pressure range Note 2)
Proof pressure Note 2)
Analog output
Power supply voltage
Current consumption
Standards and regulations
Parts material in contact with fluid
Port size
Weight (Body) Note 4)
Response time Note 3)
Voltage output
Current output
Enclosure
Operating temperature range
Operating humidity range
Environmental
resistance
Ambient temperature
Fluid temperature
Water, Conductive fluids which do not corrode the fluid contact materials. Note 1)
5 µS/cm or more (micro siemens)
Electrostatic capacity type
Negative ground
0 to 85°C(with no freezing and condensation)
Analog output: ±1.5% F.S.
±5% F.S. (25°C reference)
±5% F.S. (25°C reference)
0 to 1 MPa
2 MPa
0.5 s
Output voltage: 1 to 5 V Output impedance: 1 kΩ
Output current: 4 to 20 mA Max. load impedance: 600 Ω
24 VDC ±10%
42 mA or less (Load current is not included.)
IP65
0 to 50°C(with no freezing and condensation)
Operating, Storage: 35 to 85% R.H. (with no condensation)
CE marking, RoHS
PPS, FKM, Brass
2.5 to 100 L/min 5 to 200 L/min0.5 to 20 L/min
3/8 (10A)
Approx. 335 g
3/4 (20A)
Approx. 515 g
1 (25A)
Approx. 675 g
1/2 (15A)
Approx. 395 g
Specifications (Remote Type Sensor Unit)
Refer to page 370 for the monitor unit specifications.
Flow/Analog output
Voltage output
Current output
1 V
4 mA
A
1.1 V
4.4 mA
B
5 V
20 mA
C
LFE1
LFE2
LFE3
0.5
2.5
5
Minimum
Rated flow [L/min]
20
100
200
Maximum
Model
Flow rate
Output
A
C
B
0Min.
rated flow
Max.
rated flow
Outside the range
364
LFE Series
A

Flow Rate Characteristics (Pressure Loss)
LFE1 LFE2 LFE3
Operating Pressure Range Stability
Model
Straight piping length
LFE1
LFE2
LFE3
D
11
21
27
5D
55
105
135
(mm)
Straight Piping Length and Accuracy (Reference Value)
[Measurement conditions]
Fluid: Tap water
Pressure: 0.2 MPa
•The smaller the piping size, the more the product
is affected by the straight piping length.
The straight piping length shall be 5 times (5D) or
more of the piping size to achieve the stable
measurement.
∗Stability indicates the fluctuation width of the display or analog output.
0 D 2D 3D 4D 5D
Straight piping length
Accuracy change [% F.S.]
Accuracy change
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]
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.
±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
Operating range
Straight piping
length
[Port size]
LFE1: 3/8 inch
LFE2: 3/4 inch
LFE3: 1 inch
3
2
1
0
0
0.01
0.02
0.03
0.04
0 5 10 15 20
Flow value [L/min]
Pressure loss [MPa]
0
0.01
0.02
0.03
0.04
0 20 40 60 80 100
Flow value [L/min]
Pressure loss [MPa]
Flow value [L/min]
Pressure loss [MPa]
Straight piping
length
0
0.005
0.01
0.015
0.02
0 50 100 150 200
∗Stability is improved by increasing the response time setting.
365
Electromagnetic Type Digital Flow Switch LFE Series
3-color display
PFM
PFMV
PFMB
PFMC
PF2A
PF3W
PF2D
LFE
IF
LFE

Brown DC (+)
Black OUT1
White OUT2
Blue DC (−)
24 VDC
Load
Load 24 VDC
Brown DC (+)
Black OUT1
White OUT2
Blue DC (−)
Load
Load
Brown DC (+)
Black OUT1
Blue DC (−)
24 VDC
White Analog output
Load
Load
Main circuit Main circuit
Main circuit
Max. 80 mA
Brown DC (+)
Black OUT1
White OUT2
Load
Load
50 ms
0 V
50 ms
or
50 ms
0 V
50 ms
or
Accumulated pulse output wiring examples
Black OUT1
White OUT2 (LFEA only)
Blue DC (−)
Load
Load
Max. 28 V, 80 mA
Internal Circuits and Wiring Examples (Integrated Display Type)
NPN 2 outputs type
LFEA
NPN + Analog output type
LFEC
NPN + Analog output type
LFED
NPN 2 outputs type
LFEA
NPN + Analog output type
LFEC/LFED
PNP 2 outputs type
LFEB
PNP 2 outputs type
LFEB
Max. 28 V, 80 mA
Internal voltage drop 1 V or less
Max. 80 mA
Internal voltage drop 1.5 V or less
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
∗When accumulated pulse output is selected, the indicator light is turned off.
Brown DC (+)
N.C.
Blue DC (−)
24 VDC
White Analog output
Load
Internal Circuits and Wiring Examples (Remote Type Sensor Unit)
Analog output type
LFEJ (Voltage output type)
LFEK (Current output type)
Main circuit
∗Do not connect N.C.
366
LFE Series

DOWN button
SET button
UP button
Main screen
(2-color display)
Output display
(Status LED’s)
Sub screen Unit display
q
r
w
ee
w
r
Parts Description
Description Function
Connector
Lead wire with
M12 connector
Piping port
Display
Bracket
M12 connector for electrical connections
For piping connections
Displays the flow, set values and error information.
Mounting bracket for installing the product
Description Function
Main screen (2-color display)
Sub screen
Output display (Status LED’s)
UP button
SET button
DOWN button
Unit display
Displays the flow value, setting mode and error codes.
Displays the output condition of OUT1 and OUT2. When ON: Orange light turns on.
Selects the mode and the display shown on the sub screen, or increases the ON/OFF set value.
Used to make changes in each mode and to enter the set value.
Selects the mode and the display shown on the sub screen, or decreases the ON/OFF set value.
Indicates the unit currently selected.
Displays the accumulated flow, set value, peak/bottom value, flow direction and line
names. In setting mode, the set status is displayed. (For details, refer to page 374.)
Cable for supplying power to the product and for receiving
output
Fluid Passage Structure
Pipe
O-ring
Attachment
Spacer
No. Description
1
2
3
4
Material
PPS
FKM
C37
FKM
Body
Display
Display
Lead wire with M12 connector
(4 pins)
Piping port
Connector
Piping port
Bracket
(Option)
367
Electromagnetic Type Digital Flow Switch LFE Series
3-color display
PFM
PFMV
PFMB
PFMC
PF2A
PF3W
PF2D
LFE
IF
LFE

Without bracket (Bottom view)
Bracket thickness is approx. 1.6 mm.
4 x
O
L
K
M
N
QP
(45)
(30)
(31)
(25)
(31)
(24)
Brown
White
Blue
Black
ø15
3: Blue
2: White
M12
1: Brown
4: Black
ø6
∗For integrated display type
∗Dimensions are the same as those for integrated display type.
(3000)
Note) The electrical entry for lead wire with M12 connector does
not rotate and is limited to only one entry direction.
IN OUT
A
B
(U) (U)
Dimensions
Cable Specifications
Nominal cross section area
External diameter
Material
External diameter
Colors
Material
Conductor
Insulator
Sheath
Finished external diameter
AWG21
Approx. 0.9 mm
Non-lead heat resistant PVC
Approx. 1.7 mm
Brown, White, Black, Blue
Non-lead heat and oil resistant PVC
ø6
Pin no. Pin description Wire color
1
2
3
4
DC (+)
OUT 2
DC (−)
OUT 1
Brown
White
Blue
Black
Integrated display type LFE1/2/3
Lead wire with M12 connector
LFE13
LFE14
LFE2
LFE3
3/8
1/2
3/4
1
Model
Port size
90
104
105
120
40
40
50
55
23.5
23.5
29
32
56
56
67
73
83
83
94
100
89
89
100
106
24
28
35
41
6
6
6
6
1.6
1.6
1.6
1.6
2
2
2.6
2.6
96
96
115
115
87
87
106
106
48
48
62
62
39
39
53
53
4.6
4.6
4.6
4.6
11.5
11.5
14
20
12
12
9.5
3.5
A
73
73
78
90
B C D E F G H I J K L M N O P Q
52
52
56
68
R
28
28
38
43
S
ø2.5 depth 8.5
ø2.5 depth 8.5
ø2.5 depth 8.5
ø2.5 depth 8.5
UT
Remote type sensor unit LFE1/2/3
Width across flats
H
2 x Port size
I
J
C
D
E
F
G
1.4∗
4 x T
R
S
Note) If you are installing directly, choose the self tapping screw screw-in depth is to 8 mm. Tighten the screw with a torque of 0.7 to 0.8 N·m.
368
LFE Series

LFE A0
Type
Remote type monitor unit
0
For remote type sensor unit, select
the analog output 1 to 5 V type.
Applicable sensors: LFEJ
Output specifications
Symbol OUT1 OUT2
A
B
C
D
NPN
PNP
Analog 1 to 5 V
Analog 4 to 20 mA
NPN
PNP
NPN
NPN
With power supply/output connection lead wire (2 m)
Without power supply/output connection lead wire
Nil
N
Lead wire is not connected, but shipped together.
Lead wire
Power supply/output connection lead wire
ZS-40-W
Without connector
Sensor connector (1 pc.)
Nil
Connector is not connected, but shipped together.
Option 2
C
Sensor connector
(e-con)
None
Panel mount adapter
Nil
Option 1
T
V
Front protective cover + Panel mount adapter
Panel mount adapter
Mounting screw (M3 x 8L)
(Accessory)
Waterproof seal
(Accessory)
Panel
Waterproof seal
(Accessory)
Mounting screw (M3 x 8L)
(Accessory)
Panel mount adapter
Front protective cover
Panel
Option/Part No.
When only optional parts are required, order with the part numbers listed below.
Part no. NoteDescription
ZS-26-B
ZS-26-C
ZS-26-01
ZS-40-W
ZS-28-C-5
ZS-40-Y
With waterproof seal, mounting screw
With waterproof seal, mounting screw
Separately order panel mount adapter etc.
Lead wire length 2 m
1 pc.
Connect up to 10 slave units
Panel mount adapter
Front protective cover + Panel mount adapter
Front protective cover only
Power supply/output connection lead wire
Sensor connector (e-con)
Lead wire with connector for copying
Remote type monitor unit/Unit specifications
Symbol
Instantaneous flow rate
L/min
gal/min
M
G
Accumulated flow
L
gal
∗Under the New Measurement Law, units other
than SI (symbol “M”) cannot be used in Japan.
Note) G: Made to Order
Reference: 1 [L/min] 0.2642 [gal/min]
1 [gal/min] 3.785 [L/min]
M V C
How to Order
RoHS
Digital Flow Monitor
3-color display
LFE0 Series
369
PFM
PFMV
PFMB
PFMC
PF2A
PF3W
PF2D
LFE
IF
LFE

Specifications
Note 1) Cleared when the power supply is turned off. Hold function can be selected. (Interval of 2 or 5 minutes can be selected.) If the 5 minutes interval is
selected, the life of the memory element (electronic parts) is limited to 1 million cycles. (If energized for 24 hours, life is calculated as 5 minutes x 1
million = 5 million minutes = about 9.5 years.) Therefore, if using the hold function, calculate the memory life for your operating conditions, and use
within this life.
Note 2) The response time when the set value is 63% in relation to the step input.
Note 3) The response time until the set value reaches 63% in relation to the step input.
Model LFE0
Display flow range
Set flow range
Minimum setting unit
Accumulated volume per pulse
Display units
Accuracy
Repeatability
Temperature characteristics
Accumulated flow range Note 1)
Switch output
Analog output
Hysteresis
Input/output
Display method
Status LED’s
Power supply voltage
Current consumption
Connection
Standards and regulations
Weight
Maximum load current
Maximum applied voltage
Internal voltage drop
Response time Note 2)
Output protection
Output
mode
Response time Note 3)
Voltage output
Current output
Enclosure
Operating temperature range
Operating humidity range
Withstand voltage
Insulation resistance
Environmental
resistance
Without power supply/output
connection lead wire
With power supply/output
connection lead wire
Instantaneous flow rate L/min, Accumulated flow L
Displayed values: ±0.5% F.S., Analog output: ±0.5% F.S.
±0.5% F.S.
±0.5% F.S. (25°C reference)
NPN or PNP open collector output
80 mA
28 VDC
NPN: 1 V or less (at load current 80 mA) PNP: 1.5 V or less (at load current 80 mA)
0.5 s/1 s/2 s/5 s
Short-circuit protection
Select from hysteresis mode, window comparator mode, accumulated output mode, or accumulated pulse output mode.
0.5 s/1 s/2 s/5 s (linked with the switch output)
Output voltage: 1 to 5 V Output impedance: 1 kΩ
Output current: 4 to 20 mA Max. load impedance: 600 Ω
Variable
Input for copy mode
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
Output 1, Output 2: (Orange)
24 VDC ±10%
50 mA or less
Power supply output 5P connector, sensor connection 4P connector (e-con)
IP40 (Only front face of the panel is IP65 when panel mount adapter and waterproof seal of optional parts are used.)
0 to 50°C(with no freezing and condensation)
Operating, Storage: 35 to 85% R.H. (with no condensation)
1000 VAC for 1 minute between terminals and housing
50 MΩor more (500 VDC measured via megohmmeter) between terminals and housing
CE marking, RoHS
50 g
100 g
2.0 to 120.0 L/min
0.5 L/min
0.5 L/pulse
4 to 240 L/min
1 L/min
1 L/pulse
0.4 to 24.0 L/min
0.1 L/min
0.1 L/pulse
99999999.9 L
by 0.1 L
999999999 L
by 1 L
Flow rate
Temperature
Select from hysteresis mode or window comparator mode.
Analog Output
Flow/Analog output
Voltage output
Current output
1 V
4 mA
A
1.1 V
4.4 mA
B
5 V
20 mA
C
LFE1
LFE2
LFE3
0.5
2.5
5
Minimum
Connected
sensor
Rated flow [L/min]
20
100
200
Maximum
0.4 to 24.0 L/min
(Flow under 0.4 L/min is displayed as “0.00”)
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”)
0
Output
Min.
rated flow
Max.
rated flow
Flow rate
A
C
B
Outside the range
370
LFE0 Series
A

Brown DC (+)
Black OUT1
White OUT2
Blue DC (−)
24 VDC
Load
Load
Gray COPY
24 VDC
Brown DC (+)
Black OUT1
White OUT2
Gray COPY
Blue DC (−)
Load
Load
Brown DC (+)
Black OUT1
Blue DC (−)
24 VDC
White Analog output
Gray COPY
Load
Load
Internal Circuits and Wiring Examples
NPN 2 outputs type
LFE0A
NPN + Analog output type
LFE0C
NPN + Analog output type
LFE0D
PNP 2 outputs type
LFE0B
r
e
w
q
1 to 5 V (Flow value) White
DC (−) Blue
N.C.
DC (+) Brown
Sensor input circuit
Brown DC (+)
Black OUT1
White OUT2
Load
Load
50 ms
0 V
50 ms
or
50 ms
0 V
50 ms
or
Accumulated pulse output wiring examples
Black OUT1
White OUT2 (LFE0A only)
Blue DC (−)
Load
Load
NPN 2 outputs type
LFE0A
NPN + Analog output type
LFE0C/LFE0D
PNP 2 outputs type
LFE0B
∗When accumulated pulse output is selected, the indicator light is turned off.
Digital Flow Monitor LFE0 Series
3-color display
Main circuit Main circuit
Main circuit
Main circuit
∗Do not connect N.C.
371
PFM
PFMV
PFMB
PFMC
PF2A
PF3W
PF2D
LFE
IF
LFE

Parts Description (Remote Type Monitor Unit)
Sensor connector
Power supply/output connection lead wire
Pin no.
q
w
e
r
Terminal
DC (+)
N.C./IN
DC (−)
INPUT
Connector no.
1
2
3
4
Lead wire color ∗
Brown
Not used
Blue
White (Flow sensor 1 to 5 V input)
1234
1
2
3
4
5
Pin no.
Gray COPY
White OUT2
Black OUT1
Blue DC(−)
Brown DC(+)
2000
r
q
e
w
Cable Specifications
Conductor
Sheath
Finished external diameter
Insulator
AWG26
Approx. 0.5 mm
Cross-linked vinyl
Approx. 1.0 mm
Brown, Blue, Black, White, Gray
Oil and heat resistant vinyl
ø3.5
Nominal cross section area
External diameter
Material
External diameter
Colors
Material
∗When using the lead wire with M12 connector included with the LFEJ series.
Do not connect black.
Sensor connector
Power supply/output connection lead wire
Main screen (2-color display)
Output display
(Status LED’s)
Sub screen
UP button SET button DOWN button
Unit display
Description Function
Main screen (2-color display)
Sub screen
Output display (Status LED’s)
Unit display
UP button
SET button
DOWN button
Displays the flow value, setting mode and error codes.
Displays the output condition of OUT1 and OUT2. When ON: Orange light turns on.
Indicates the unit currently selected.
Selects the mode and the display shown on the sub screen, or increases the ON/OFF set value.
Press this button to change the mode and to set a value.
Selects the mode and the display shown on the sub screen, or decreases the ON/OFF set value.
Displays the accumulated flow, set value, peak/bottom value, fluid temperature and line
names. In the setting mode, the set status is displayed. (For details, refer to page 374.)
372
LFE0 Series

NC/IN
40.1 (7.5)
2.5
36.8
6
40
40
Front protective cover
Waterproof seal
Panel
Panel mount adapter
Power supply/output connector (5P)
Sensor connector (4P)
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
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
Digital Flow Monitor LFE0 Series
3-color display
373
PFM
PFMV
PFMB
PFMC
PF2A
PF3W
PF2D
LFE
IF
LFE

0.25 seconds
0.5 seconds
1 second
2 seconds
5 seconds
±3.7% F.S.
±2.5% F.S.
±1.7% F.S.
±1.2% F.S.
±0.8% F.S.
Response time
Stability
ON: Green, OFF: Red
ON: Red, OFF: Green
Always: Red
Always: Green
Displays the set value. (The set value
of OUT2 cannot be displayed.)
Set value display
Displays the accumulated value. (The accumu-
lated 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.
Flow direction display
Displays nothing.
Off
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 setting.)
Setting of response time
The response time can be selected depending
on the application. (1 second for default setting)
The flickering of the display can be reduced
by setting the response time slower. If you
need faster detection of the problem such
as leakage of tip cooling water for welding
gun, switch output or analog output can be
faster by setting the response time faster.
In this case, widen the hysteresis to pre-
vent 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 rate, output corresponding to accumulated
flow, or accumulated pulse output
Note) At the time of shipment from the factory, it is set to hysteresis mode
and normal output.
Forced output function
Output is turned ON/OFF compulsorily when starting the system or
during maintenance. This enables confirmation of the wiring and
prevents system errors due to unexpected 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.
∗Also, the increase or decrease of the flow will not change the on/off
status of the output while the forced output function is activated.
Accumulated value hold function
Accumulated value is not cleared even when the power supply is turned
off. The accumulated value is memorized every 2 or 5 minutes during
measurement, and continues from the last memorized value when the
power supply is turned on again.
The life time of the memory element is 1 million access cycles. Take this
into consideration before using this function.
Switching of flow direction
Flow direction can be changed after installation.
Selection of display on sub screen
The display on the sub screen in measuring mode can be set.
LFE Series
Function Details
Sub screen
Integrated display type Remote type monitor unit
Normal flow (Left to right)
Reverse flow (Right to left)
( ∗ Integrated display type only)
(∗Integrated display type only)
374

Function Details LFE Series
[F22] Setting of analog output
This function can be used only when the optional analog output is present. The flow value that generates the output voltage (= 5 V) or output
current (= 20 mA) at the span side of analog output can be varied.
Peak/Bottom value display
The maximum (minimum) flow value is detected and updated from
when the power supply is turned on. In peak (bottom) value display
mode, this maximum (minimum) flow value is displayed.
Setting of security code
Users can select whether a security code must be entered to release
key lock. At the time of shipment from the factory, it is set such that
the security code is not required.
Selection of power saving mode
The display can be turned off to reduce the power consumption
(Approx.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.
Keylock function
Prevents operation errors such as accidentally changing set values.
Sub screen
Free range
ON
Press the button.
Return to function selection mode.
Press the button to set.
Press the button.
[F22] Setting of analog output complete
OFF
Free range
OFF
<Operation>
Press the or button in function selection mode to display [F22] on the main screen.
Use the or button to enter the flow value that will
generate 5 V or 20 mA. The entered flow value can be
in the range: 10% rated flow, to the upper display limit.
0
1
2 20 24
5
Flow rate [L/min]
Variable range
Default setting
20 L/min (Analog 1-5 V)
Sub screen
The sub screen alternately displays [AnA] and the current set value.
∗ : If the analog output is not present, the sub screen alternately displays [AnA]
and [
− − − ].
ON
Analog output [V]
375
PFM
PFMV
PFMB
PFMC
PF2A
PF3W
PF2D
LFE
IF
LFE

( )
alternately displays
[999] and [999999]
Error display function
When a failure or abnormality occurs, the location and contents are displayed.
DescriptionDisplay Contents Action
Load current of 80 mA or more is applied to the
switch output (OUT1).
Load current of 80 mA or more is applied to the
switch output (OUT2).
Flow has exceeded the accumulated flow range.
Displayed if an internal error has occurred.
Eliminate the cause of the over current by turning
off the power supply and then turn it on again.
Decrease the flow.
Clear the accumulated flow.
(This error does not matter when the accumu-
lated flow is not used.)
Turn off the power supply and then turn it on
again. If the failure cannot be solved, please
contact SMC for investigation.
OUT1 over current error
OUT2 over current error
Excessive
accumulated flow error
Excessive instantaneous
flow rate error
System error
Reverse flow error
Sensor error
Flow is flowing in the reverse direction of the setting.
Flow has exceeded the display flow range.
Power supply voltage exceeds 24 V ±10%. Check the power supply voltage, and turn off
the power supply and then turn it on again.
Change the setting for the flow direction.
LFE Series
376

OUT
IN
Uninstallable area
50 mm 50 mm
20 mm
20 mm
Susceptible to bubbles
Top
Under
Electrode
Bubbles
Top
Not susceptible to bubbles
Under
Electrode
Display
Fluid
passage Bubbles
OUT
IN
IN
OUT
Be sure to read this before handling the products.Refer to back page 50 for Safety
Instructions and pages 202 and 203 for Flow Switch Precautions.
Warning Warning
Installation Mounting
1. Piping port is grounded to DC(-)/blue line.
Do not use the power supply with positive ground.
2. Avoid piping in which the piping size of the IN side
of the switch changes suddenly.
If the piping size is reduced sharply or there is a restrictor such
as a valve on the IN side, fluid velocity distribution in the piping
will be disturbed, leading to improper measurement. There-
fore, the above-mentioned piping should be connected on the
OUT side.
If the OUT side is opened, or flow rate is excessive, cavitations
may be generated, which may result in improper measure-
ment. As a measure against this, it is possible to reduce the
cavitations by increasing the fluid pressure. Take action such
as mounting an orifice on the OUT side of the switch, and
confirm that there is no malfunction before handling. If the
orifice of the OUT side is fully closed to operate the pump, the
switch may malfunction due to the effect of pulsation (pressure
fluctuation). Ensure that there is no malfunction before usage.
3. When multiple sensors are used in parallel, install
them outside of the area as shown below.
(Uninstallable area) If the product is mounted in the
area where installation is prohibited, the accuracy
will decrease.
1. Since the type of fluid varies depending on the
product, be sure to verify the specifications.
The switches do not have an explosion proof rating. To
prevent a possible fire hazard, do not use with inflammable
gases or fluids.
2. Install the system, so that the fluid always fills the
detection passage.
When the product is mounted vertically, place the display vertical
to the floor to prevent bubbles from occurring.
4. Use caution that the electrical entry for lead wire
with M12 connector does not rotate and is limited to
only one direction.
If the product is used when the
detection passage is not filled,
correct detection signal is not
output from the electrodes,
making correct measurement
impossible. When the detec-
tion passage is empty, the dis-
play may become unstable.
Therefore, install the system
so that the fluid remains in the
detection passage when the
fluid flow is stopped. For verti-
cal mounting, introduce the flu-
id from the bottom to the top
because bubbles may be gen-
erated when applying fluid
from the top to the bottom,
leading to operation failure.
LFE Series
Specific Product Precautions 1
Mounting orientation: Mounting orientation: ×
377
PFM
PFMV
PFMB
PFMC
PF2A
PF3W
PF2D
LFE
IF
LFE

Tubing
Attaching/
Detaching tubing
NG
NG
NG
Hold by hand
Apply a wrench
Turn the
piping
Mounting
Refer to the tightening torque in the
right table for connecting steel piping.
Torque lower than the value in the table
leads to fluid leakage.
For mounting the fittings on the market,
refer to the torque specified for each.
3/8
1/2
3/4
1
24 mm
28 mm
35 mm
41 mm
Width across flats
of attachment
Nominal thread size
Rc (NPT) 3/8
Rc (NPT) 1/2
Rc (NPT) 3/4
Rc (NPT) 1
Proper tightening torque (N·m)
22 to 24
28 to 30
28 to 30
36 to 38
Caution
1. When connecting the piping to the switch, do not
rotate the switch. Apply a wrench to the metal part
of the piping port to turn the fitting.
Using a wrench on other parts may damage the product.
Specifically, make sure that the wrench does not damage the
M12 connector. This will damage the connector.
2. The product body is made of resin. Do not impose
stress, vibration or impact directly on the product
during piping work in order to prevent failure, dam-
age and water leakage.
In particular, never mount a product in a location that will be
used as a foothold.
LFE Series
Specific Product Precautions 2
7. The straight piping length on the primary side of the
product shall be 5 times (5D)or more of the piping
size to achieve stable measurement. (Refer to page
365.)
8. The operating pressure range and operating
temperature range of the product vary depending
on the operating conditions.The fluid pressure and
temperature should fall within their respective
allowable ranges during operation. (Refer to page
365.)
6. When using a One-touch fitting, hold the fitting by
hand to prevent the load required for connecting or
disconnecting the tube from being imposed directly
on the product.
5. Inflexible piping such as steel piping tends to be
affected by spread of excessive moment load or
vibration from the piping side. Lay flexible tubing
between the steel pipe and the product to prevent
such effects.
In particular, if the piping is off center with the product, load
will be imposed on the piping for a long period even after the
piping work, possibly resulting in failure, damage or water
leakage.
4. If stress, vibration and impact imposed on the
product cannot be reduced, secure each pipe at
multiple positions.
3. Secure the front and rear pipes as close to the
product as possible in order to prevent stress,
vibration and impact from being imposed directly
on the product.
Flexible piping
Moment load
OK
NG
Vibration
Piping fixed parts
Off-centering
NG
Be sure to read this before handling the products.Refer to back page 50 for Safety
Instructions and pages 202 and 203 for Flow Switch Precautions.
378