SMC Networks LFE#### Operation Manual
Doc.No.LV50***-OMQ0004-B
Product
Electromagnetic Type Digital flow switch
Model/ Series/ Product No.
LFE####
SMC Corporation
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No.LV50***-OMQ0004-B
Contents
Safety Instructions 2
Model Indication and How-to-Order 11
Summary of product parts 13
Definitions and terminology 14
Mounting and Installation 15
Installation 16
Piping method 17
Wiring 18
Maintenance 20
Troubleshooting 21
Specifications 22
Table of Specifications 22
Applicable Fluids 23
Characteristics Chart 24
Analogue output 27
Dimensions 28
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No.LV50***-OMQ0004-B
Safety Instructions
These safety instructions are intended to prevent hazardous situations and/or equipment damage. These
instructions are categorized into three groups, "Caution", "Warning" and "Danger" depending on the level of
hazard and damage, and the degree of emergency. They are all important notes for safety and must be followed
in addition to International Standards (ISO/ IEC), Japan Industrial Standards (JIS)
*1)
and other safety
regulations
*2)
.
*1) ISO 4414: Pneumatic fluid power -- General rules relating to systems.
ISO 4413: Hydraulic fluid power -- General rules relating to systems.
IEC 60204-1: Safety of machinery -- Electrical equipment of machines. (Part 1: General requirements)
ISO 10218-1992:Manipulating industrial robots-Safety.
JIS B 8370: Pneumatic fluid power - General rules relating to systems
JIS B 8361: Hydraulic fluid power - General rules relating to systems
JIS B 9960-1: Safety of machinery - Electrical equipment of machines (Part 1: General requirements)
JIS B 8433-1993: Manipulating industrial robots - Safety, etc
*2) Labor Safety and Sanitation Law, etc.
Caution
Caution indicates a hazard with a low level of risk, which if not avoided, could result in minor or
moderate injury.
Warning
Warning indicates a hazard with a medium level of risk, which if not avoided, could result in
death or serious injury.
Danger
Danger indicates a hazard with a high level of risk, which if not avoided, will result in death or
serious injury.
Warning
(1) The compatibility of the product is the responsibility of the person who designs the equipment or
decides its specifications.
Since the product specified here is used under various operating conditions, its compatibility with specific
equipment must be decided by the person who designs the equipment or decides its specifications based on
necessary analysis and test results. The expected performance and safety assurance of the equipment will be
the responsibility of the person who has determined its compatibility with the product. This person should also
continuously review all specifications of the product referring to its latest catalog information, with a view to
giving due consideration to any possibility of equipment failure when configuring the equipment.
(2) Only personnel with appropriate training should operate machinery and equipment.
The product specified here may become unsafe if handled incorrectly.The assembly, operation and
maintenance of machines or equipment must be performed by an operator who is appropriately trained and
experienced.
(3) Do not service or attempt to remove product and machinery/equipment until safety is confirmed.
1. The inspection and maintenance of machinery/equipment should only be performed after measures to
prevent dropping of driven objects or run-away of machinery/equipment have been confirmed.
2. When the product is to be removed, confirm that the safety measures as mentioned above are implemented
and the power from any appropriate source is cut, and read and understand the specific product precautions
of all relevant products carefully.
3.Before machinery/equipment is restarted, take measures to prevent unexpected operation and malfunction.
(4) Contact SMC beforehand and take special consideration of safety measures if the product is to be
used in any of the following conditions.
1. Conditions and environments outside of the given specifications, or used outdoors or in a location exposed
to direct sunlight.
2.Installation of equipment in conjunction with atomic energy, railways, air navigation, space, shipping,
vehicles, military, medical treatment, combustion and recreation, or equipment in contact with food and
beverages, emergency stop circuits, clutch and brake circuits in press applications, safety equipment or
other applications unsuitable for the standard specifications described in the product catalog.
3. An application which could have negative effects on people, property, or animals requiring special safety
analysis.
4. Use in an interlock circuit, which requires the provision of double interlock for possible failure by using a
mechanical protective function, and periodical checks to confirm proper operation. Check the product
regularly in order to confirm normal operation.
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No.LV50***-OMQ0004-B
Safety Instructions
Caution
The product is provided for use in manufacturing industries.
The product herein described is basically provided for use in manufacturing industries.
If the product is being considered for use in other industries, consult SMC beforehand and exchange
specifications or a contract if necessary.
If anything is unclear, contact your nearest sales branch.
Limited Warranty and Disclaimer/ Compliance Requirements
The product used is subject to the following “Limited warranty and Disclaimer” and “Compliance Requirements”.
Read and accept them before using the product.
[Limited Warranty and Disclaimer]
(1) The warranty period of the product is 1 year in service or within 1.5 years after the product is
delivered.
*3)
Also, the product may have specified durability, running distance or replacem ent parts. Please consult
your nearest sales branch.
(2) For any failure or damage reported within the warranty period which is clearly our responsibility, a
replacement product or necessary parts will be provided.
This limited warranty applies only to the SMC product independently, and not to any other damage
incurred due to the failure of the product.
(3) Prior to using SMC products, please read and understand the warranty terms and disclaimers noted
in the specified catalog for the particular products.
*3) Vacuum pads are excluded from this 1 year warranty.
A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
Also, even within the warranty period, the wear of a product due to the use of the vacuum pad or
failure due to the deterioration of rubber material are not covered by the limited warranty.
[Compliance Requirements]
When the product is exported, strictly follow the laws required by the Ministry of Economy, Trade and Industry
(Foreign Exchange and Foreign Trade Control Law).
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No.LV50***-OMQ0004-B
■Explanation of Symbols
Symbol Definition
Things you must not do.
Actual instructions are provided as a drawing or sentence close to this mark.
Things you must do
Actual instructions are provided as a drawing or sentence close to this mark.
■Operator
(1) This Operation Manual is intended for those who have knowledge of machinery using pneumatic
equipment, and have sufficient knowledge of assembly, operation and maintenance of such equipment.
Only those persons are allowed to perform assembly, operation and maintenance.
(2) Read and understand this Operation Manual carefully before assembling, operating or providing
maintenance to the product.
■ Safety Instructions
Warning
Disassembly
prohibited
# Do not disassemble, modify (including the replacement of board) or repair.
Otherwise, an injury or failure can result.
Do not
■Do not operate the product outside of the specifications.
Do not use for flammable or harmful fluids.
Fire, malfunction, or damage to the product can result.
Please check the specifications before use.
Do not
■Do not use in an atmosphere containing flammable or explosive gases.
Fire or an explosion can result.
The product is not designed to be explosion proof.
Do not
■Do not use the product for flammable or highly permeable fluids.
Fire, explosion, breakage or corrosion can result.
Do not
■Do not use the product in a place where static electricity is a problem.
Otherwise failure or malfunction of the system can result.
Instruction
If using the product in an interlocking circuit:
- Provide a double interlocking system, for example a mechanical system.
- Check the product for proper operation.
Otherwise malfunction can result, causing an accident.
Instruction
The following instructions must be followed during maintenance :
- Turn off the power supply
- Stop supplying fluid before maintenance.
It may cause an injury.
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No.LV50***-OMQ0004-B
Caution
Do not touch
■Do not touch the terminals and connectors while the power is on.
Otherwise electric shock, malfunction or damage to the switch can result.
Do not touch
■Do not touch the piping joint or piping when hot fluid is used.
It may lead to burn.
Check that the piping is cooled down before touching it.
Instruction
# After maintenance is complete, perform appropriate functional inspections and leak
test.
Stop operation if the equipment does not function properly or there is leakage of fluid.
When leakage occurs from parts other than the piping, the product itself may be damaged.
Cut off the power supply and stop the fluid supply.
Do not apply fluid if the system is leaking.
Safety cannot be assured in the case of unexpected malfunction.
■ Handling Precautions
-Follow the instructions given below for selecting and handling.
● The instructions on design and selection (installation, wiring, environment, adjustment, operation,
maintenance, etc.) described below must be followed.
*Product specifications
- Use the specified voltage.
Otherwise failure or malfunction can result.
Insufficient supply voltage may not drive a load due to a voltage drop inside the product.
Verify the operating voltage of the load before use.
Do not exceed the specified maximum allowable load.
This may cause damage or shorten the lifetime of the product.
Data stored by the product is not deleted, even if the power supply is cut off. (Write limit: 1000000 cycles,
Data duration: 20 years after power off.)
- Confirm the pressure loss at the sensor according to the flow rate characteristics (pressure loss) graph
before designing piping.
Confirm pressure loss of the sensor from the flow characteristics chart.
- Take care that pressure exceeding the specified range will not be applied due to water pulsation.
<Examples of measures for reducing water pulsation>
(1) Use a water pulsation resistant valve.
(2) Use elastic piping material such as rubber hose etc. and an accumulator to absorb impact pressure.
Shorten the length of piping as much as possible.
- Use the product within the specified operating pressure and temperature range.
Withstand pressure is 2.0MPa. Withstand pressure depends on fluid temperature. Refer to the chart of
the operating pressure range.
- Reserve a space for maintenance.
When designing an application, allow sufficient clearance for maintenance and inspection.
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No.LV50***-OMQ0004-B
● Product handling
Installation
- Tighten to the specified tightening torque.
If the tightening torque is exceeded, the mounting screws and brackets may be damaged. Insufficient torque can
cause displacement of the product from its proper position and the looseness of the mounting screws.
(Refer to Mounting and Installation (page 16 to 21).)
- Be sure to ground terminal FG when using a switch-mode power supply that is commercially obtained.
- Do not use where the product is subjected to vibration or impact.
Otherwise damage to the internal components may result, causing malfunction.
Do not pull the lead wire forcefully, or lift the product by the lead wire. (Tensile strength 49 N or less)
Hold the product body when handling to prevent damage, failure or malfunction.
The product will be damaged, leading to failure and malfunction.
- When multiple sensors are used in parallel, the accuracy is deteriorated if they are mounted too closely
together.
For piping of the pressure switch, hold the piping with a tool on the metal part of the product (piping
attachment).
Holding other parts with a tool may damage the product.
Specifically, make sure that the
tool does not damage the M12 connector.
This will damage the connector.
- Any dust left in the piping should be flushed out by air before connecting the piping to the product.
Failure or malfunction may result.
- Ensure the flow direction of the fluid is aligned with the flow direction indicated on the product label
before installation and piping.
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. Therefore, 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
measurement. 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.
Do not insert metal wires or other foreign matter into the flow path.
This can damage the sensor causing failure or malfunction.
- Never mount the product in a place that will be used as a scaffold during piping.
The product may be damaged if excessive force is applied by stepping or climbing onto it.
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No.LV50***-OMQ0004-B
- Design and install the product so that fluid always
fills the detection passage.
1, 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.
For vertical mounting, apply fluid from the bottom
to the top. Bubbles may be generated when
applying fluid from the top to the bottom, leading
to operation failure.
(There should not be a problem as long as the
fluid passage is completely filled with fluid)
2. When the product is mounted vertically, place the
display perpendicular to the floor (to place the
electrodes on the right and the left) to prevent
bubbles from occurring.
After installation, the flow direction can be
changed by setting.
Refer to “Operation” in page 46 for details for
setting.
Down Down
Display
Not
suscep
tible to bubbl
es
Electrode
Fluid passage
S
uscep
tible to bubbl
es
Above Above
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No.LV50***-OMQ0004-B
* Wiring (Including connecting/disconnecting of the connectors)
Do not pull hard on the lead wire, or lift the product by holding the lead wires (Tensile strength 49 N or
less). Especially never lift the product equipped with fitting and piping by holding the lead wires.
Damage to the connector, circuit board, cover or internal components may result, causing failure or malfunction.
- Avoid repeatedly bending, stretching or applying a heavy object or force to the lead wire.
Repetitive bending stress or tensile stress can cause the sheath of the wire to peel off, or breakage of the wire.
If the lead wire can move, fix it near the body of the product.
The recommended bend radius of the lead wire is 6 times the outside diameter of the sheath, or 33 times the
outside diameter of the insulation material, whichever is larger.
Replace the damaged lead wire with a new one.
- Wire correctly.
Incorrect wiring can cause malfunction or damage the product.
- Do not perform wiring while the power is on.
Otherwise damage to the internal components may result, causing malfunction.
- Do not route wires and cables together with power or high voltage cables.
Route the wires of the product separately from power or high voltage cables to prevent noise and surge from
entering the product.
- Confirm proper insulation of wiring.
Poor insulation (interference with other circuits, poor insulation between terminals etc.) can apply excessive
voltage or current to the product causing damage.
- Design the system to prevent reverse current when the product is performing an operational check.
Depending on the circuit used, insulation may not be maintained when operation is forced, allowing reverse
current to flow, which can cause malfunction and damage to the product.
Keep wiring as short as possible to prevent interference from electromagnetic noise and surge voltage.
Do not use a cable longer than 10 m.
Wire the DC (-) line (blue) as close as possible to the power supply.
When analog output is used, install a noise filter (line noise filter, ferrite element, etc.) between the
switch-mode power supply and the product.
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No.LV50***-OMQ0004-B
Operating environment
- Do not use the product in an environment where the product is constantly exposed to water splashes.
Otherwise failure or malfunction can result. Take measures such as using a cover.
- Do not use in an environment where the product could be exposed to corrosive gas or liquids.
Otherwise damage to the internal parts can result, causing malfunction.
Do not use the product in a place where the product could be splashed by oil or chemicals.
If the product is to be used in an environment containing oils or chemicals such as coolant or cleaning solvent,
even for a short time, it may be adversely affected (damage, malfunction, or hardening of the lead wires).
- Do not use in an area where surges are generated.
When there are machines or equipment that generate large surges near the product (magnetic type lifter, high
frequency inductive furnace, motor, etc.), this can result in deterioration and damage of the internal elements. Take
measures against the surge sources, and prevent the lines from coming into close contact.
Do not use a load which generates surge voltage.
When a surge-generating load such as a relay or solenoid is directly driven, use the product with a surge
absorbing element built-in.
- The product is CE marked, but not immune to lightning strikes. Take measures against lightning strikes
in the system.
- Mount the product in a location that is not affected by vibration or impact.
Failure or malfunction may result.
- Do not use the product in the presence of a magnetic field.
Malfunction can result.
- Do not let foreign matter, such as wire debris, get inside the product.
- In order to avoid failure and malfunction, do not let foreign matter, such as wire debris, get inside the product.
Do not use the product in an environment that is exposed to temperature cycle.
Heat cycles other than ordinary changes in temperature can adversely affect the internal components of the
product.
- Do not expose the product to direct sunlight.
If using in a location directly exposed to sunlight, protect the product from the sunlight.
Failure or malfunction may result.
- Keep within the specified operating fluid and ambient temperature range.
The operating fluid temperature range is 0 to 85 , and ambient temperature range is 0 to 50°C.
If the fluid freezes, it may cause damage and malfunction of the switch, so please take measures to prevent
freezing.
If the temperature of the fluid is lower than the ambient temperature, condensation will be generated which may
damage the product or cause malfunction.
Protection against freezing is necessary.
Avoid abrupt temperature changes even within the specified temperature range.
Failure or malfunction may result.
- Do not operate close to a heat source, or in a location exposed to radiant heat.
Insufficient air quality may cause operation failure.
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