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  4. Flow Sensors

Product catalogue

Flow Switches

Reliable flow sensors for precision measurement & monitoring of fluids and gases

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PFUW
NEW

PFUW

  • Clamp-on Type Flow Sensor for Liquids
  • Applicable fluid: oil, antifreeze, chemical liquids, water, high-pressure fluids, beverages, etc.
  • LCD 2-screen display
  • Detection method: ultrasonic method
  • Rated flow ranges: from 0 to 100 l/min
  • Output: IO-Link, NPN/PNP or analogue (voltage/current)
  • Repeatability: ±2.0 % F.S.
  • Consumption: 85 mA or less
  • IP65/IP67.

PF2MC7
NEW

PF2MC7

  • Digital flow switch
  • Applicable fluid: dry air and N2
  • 3-colour, 3-screen display
  • Flow ratio: 100:1
  • Outputs: IO-Link, NPN/PNP and analogue/external input
  • Rated flow ranges: from 5 to 2000 l/min
  • IP65
  • Repeatability: ± 0.1 % F.S. ± 1 digit
  • M8 standard connector
  • Switchable analogue output (1-5 V or 0-10 V) and switch output (NPN or PNP).

PFMV/PFGV301
NEW

PFMV/PFGV301

  • Flow sensor for the suction verification of small workpieces
  • Applicable fluid: Dry air, N2
  • Remote 3-screen display available
  • Outputs: analogue voltage for sensor, 2 x NPN/PNP + analogue voltage/current for digital flow monitor
  • Rated flow ranges: from -3 to 3 l/min
  • IP40
  • Repeatability: ±2 F.S
  • M5 female thread port.

PFG200
NEW

PFG200

  • 2-tier, 3-screen and 3-colour display
  • 4-channel monitor, up to 4 sensors can be connected
  • Outputs: IO-Link and NPN/PNP
  • IP65 (front face), IP40 (others)
  • Repeatability: ±0.1 % (F.S.)
  • Consumption: 55 mA or less
  • IO-Link hub function available
  • Simple 3-step set up.

PF3A

PF3A

  • Digital flow switch for large flow
  • Applicable fluid: Air, N2
  • Flow ratio: 100:1
  • Built-in temperature and pressure sensor version available
  • Modular type available
  • 3-colour 2 or 4-screen display
  • Outputs: IO-Link, NPN/PNP and analogue/external input
  • Rated flow ranges: from 10 to 12000 l/min
  • Repeatability: ±1.0 % F.S.
  • IP65.

PF3W

PF3W

  • Digital Flow Sensors for liquids
  • Applicable fluid: Water, Ethylene glycol aqueous solution, Deionized water and diverse Chemical liquids
  • Integrated display: 3-colour/2-screen display
  • Built-in temperature sensor
  • Manifold mounting available
  • Flow adjustment valve option
  • Rated flow ranges: from 0.5 to 250 l/min
  • Output: IO-Link, NPN/PNP or Analogue (Voltage/Current)
  • Repeatability: ±0.2 % F.S.
  • Consumption: 50 mA or less
  • IP65.

PF2M7/PFGM3#2

PF2M7/PFGM3#2

  • Digital flow switch with integrated display
  • Applicable fluid: Dry air, nitrogen, carbon dioxide, argon
  • 2-colour display
  • Remote 3-screen display available
  • Flow adjustment valve option
  • Flow ratio 100:1
  • Rated flow ranges: from 0.01 to 100 l/min
  • Output: PNP/NPN, analogue (voltage/current) and/or IO-Link
  • Repeatability: ±1.0% F.S.
  • Consumption: 35 mA or less.

PFMB

PFMB

  • 2-colour digital flow switch for dry air and N2.
  • Large flow rates, up to 2000 l/min.
  • Wide measuring range, rangeability: 100:1.
  • Quick response: highest speed 0.05 s.
  • Compact.
  • Flip vertical option to adjust display’s orientation.

LFE

LFE

  • Digital electromagnetic flow switch
  • Applicable fluid: water, water-soluble coolant
  • 3-colour display
  • Flow ratio: 40:1
  • Rated flow ranges: from 0.5 to 200 l/min
  • Response time can be selected from 0.25, 0.5, 1, 2, and 5 sec
  • Very low pressure loss: 0.02 MPa or less
  • Flow direction can be changed after installation.

PFM

PFM

During the past few years it’s generally been accepted that analogue float type flow meters cannot always provide an accurate indication of performance when used in low flow rate applications. But now, thanks to R&D engineers from SMC, the world’s leading automation experts and their new Series PFM Digital Flow Switch using MEMS technology, this simply isn’t the case.Developed initially to detect microchip component adsorption in vacuum and early clogging in both filter and nozzle applications, the new Series PFM Flow Switch is incredibly compact and lightweight compared to existing flow sensors thanks to its micro electro mechanical system (MEMS) sensor. With its unique integrated flow adjustment valve, which can be added or disconnected by simply removing its retaining clip, linear flow rate can be adjusted manually by rotating the flow rate adjustment knob. Further features of the PFM are the dual colour digital display which indicates any performance irregularities at a glance and due to its MEMS sensor both straight or elbow piping options are possible making this the perfect flow switch when space limitations are an issue.Currently the PFM range is available in four maximum flow rate options 10, 25, 50 and 100 l/min and is suitable for use with air, nitrogen, argon or carbon dioxide.

PF2

PF2

SMC offers a variety of digital flow switches. Series PF2A for air, PF2W for water, PF2D for deionized water and chemicals. Flow rate setting and monitoring are possible with the digital display. Integrated and remote type displays are available for different types of application. Water resistant construction is used conforming to IP65 protection. Switching from real-time flow rate to accumulated flow is possible.

IFW

IFW

IFW series flow switches detect and confirm liquid flow. They are applicable to general industrial machines and various other applications. The IFW series will detect the flow of water and other non-corrosive fluids. The detection range is from 1 to 50 liters per minute. The flow setting can be adjusted with a screwdriver from the outside of the unit without removing the cover.

IF

IF

The paddle style flow switch, series IF3 detects and confirms liquid flow. The series is generally used in fields such as air conditioning, water supply equipment, etc. Enclosures include a standard type for indoor applications away from moisture; drip proof (JIS C0920) which can tolerate water drip in indoor or outdoor applications; and splash proof (JIS C0920) which has a sealed construction that can tolerate hosing or salt laden atmospheres.

PFG300

PFG300

  • 3-screen, 3-colour display
  • Applicable series: PF3A7#H, PFMB, PFMC
  • Outputs: 2 outputs, NPN/PNP and analogue (voltage/current)
  • IP40
  • Copy function: copy master monitor settings to slaves
  • External input: reset parameters remotely
  • Repeatability: ±0.1 % F.S.
  • Consumption: 25 mA or less.

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What are flow sensors used for?

Flow switches are critical components in industrial installations that measure and monitor the flow of fluids and gases within pneumatic and hydraulic systems. These devices provide precise flow rate measurements, ensuring the efficient operation of machinery and preventing potential damage caused by irregular flow.

Flow measurement is essential across various industries and aspects, such as machine tool industry, industrial maintenance, industrial communication and energy efficiency, where precise control over fluid or gas movement can significantly enhance operational efficiency, improve safety, and reduce energy consumption.

SMC’s flow sensors and switches: Versatile solutions for diverse applications

At SMC, we offer a wide range of flow sensors and switches designed to meet diverse industrial needs. Our portfolio includes:

  • Remote type flow meters: Ideal for installation in hard-to-reach locations.
  • Integrated display versions: Allowing quick and clear visualisation of any parameter.
  • Sensor monitors: Enabling remote monitoring for enhanced operational control.

Whether you require a compact solution for tight spaces or a high-precision system for complex processes, SMC’s flow sensors and switches are engineered to provide accurate and real-time data on flow rates. Industrial communication specifications are another key aspect, offering different options such as IO-Link, analogue or digital communication.

Our flow sensors are compatible with various fluid types, offering flexible solutions for a broad spectrum of industries.

Typical applications for flow switches for gases are:

  • Flow control of equipment, main line and branch line
  • Control of purge air flow in ionizer
  • Accumulated indication operating flow rate or residual amount (of N2 etc.) in a gas cylinder
  • Flow control of the air for spray painting
  • Flow control of N2 gas to prevent lead frame oxidation
  • Control of metal wire tension
  • Suction verification of workpieces
  • Leak test
  • Easy placement verification

Typical applications for flow switches for liquids are:

  • Flow control for pressurised cooling water for welding guns
  • Flow control for water-soluble coolant
  • Flow control for cooling water for metal moulds
  • Flow control of the circulating fluid in a chiller
  • Cooling of processing machines
  • Beverage management of filler machines
  • Drainage management
  • Cooling of PET bottle moulding machines

How can SMC flow sensors enhance your industrial process?

With SMC’s diverse range of flow sensors, you can benefit from:

  • Extensive product range:  Our flow meters are compatible with various fluids, configurations, and flow rate capacities. From compact designs to high-capacity models, we provide solutions to meet every need.
  • Comprehensive monitoring:  Equipped with advanced display options, our sensors deliver real-time data to keep you informed about your system's status. This reduces downtime and enhances system reliability.
  • Easy setup:  User-friendly design ensures quick and easy installation, saving time and boosting operational efficiency.
  • Seamless connectivity: In line with Industry 4.0 trends, our sensors support multiple industrial communication options, including IO-Link, analog, and digital protocols, for seamless integration.
  • Optimised system performance: Monitoring different parameters of an installation is essential for achieving enhanced performance. By continuously monitoring flow rates, our flow sensors enable proactive adjustments to maintain consistent operation, preventing overflows, leaks, and system failures.

Whether you're seeking to improve energy efficiency, reduce operational costs, or enhance system performance, SMC flow sensors are designed to ensure your equipment operates at its best, ultimately contributing to smoother and more effective industrial operations.

Explore our range of sensors and switches and find the perfect fit for your needs using the Digital Switch Model Selector inside the Engineering Tools section on our website.

Are you having any difficulties selecting the right sensor or switch? Don't hesitate to get in touch with our experts for more accurate and detailed info.