Flow switch | RS UAE

Number of Ports

3 (130)

5 (49)

2 (24)

4 (8)

1 (5)

28 (1)

54 (1)

Number of Positions

2 (111)

3 (20)

1 (2)

4 (1)

Port Gender

Female (30)

Male/Female (6)

Minimum Media Temperature

0 °C (15)

-18 °C (4)

-40°C (3)

-20 °C (1)

+21.1 °C (1)

Voltage

10 V (7)

48 V dc (5)

230 V ac (4)

15 to 30 V dc (1)

Colour

Brown (4)

Silver (3)

Anthracite (2)

Polar White (2)

White (2)

Black (1)

Chrome (1)

Hazardous Area Certification

ATEX (7)

No (7)

IECEx, ATEX (1)

Number of Gangs

1 (11)

3 (3)

2 (1)

Depth

12mm (9)

9mm (3)

17.9mm (1)

96mm (1)

Mount Type

Surface (6)

Panel (2)

DIN Rail, Horizontal, Vertical (1)

DIN Rail, Vertical, Horizontal (1)

Horizontal, DIN Rail, Vertical (1)

Vertical, Horizontal (1)

Vertical, Horizontal, DIN Rail (1)

Range

INTEGRO FLOW (9)

FLOW & PURE (1)

IP Rating

IP65 (7)

IP54 (1)

IP68, IP65 (1)

Maximum Supported Wattage

96W (5)

125W (4)

Finish

Gloss (3)

Matt (2)

Chrome Glossy (1)

Matt Chrome (1)

White (1)

Measurement Principle

Thermal (5)

Flow Sensor (2)

Pressure, Position Sensor, Io Link Interface, Flow Measurement, Analogue and Digital Signal Conversion (1)

Control Output

Switching Output, COM NC (3)

NPN Open Collector (2)

COM NC, Switching Output (1)

Relay (1)

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RS PRO Piston Inline Flow Switch for Liquid, 0.04 L/min Min, 0.13 L/min Max

RS Stock No. 510-0559

Brand RS Pro

Connection Type: 1/4 BSP
Current Rating: 1 A
Maximum Media Temperature: +100°C

AED 1.744.85

in stock now

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RS PRO Paddle Flow Switch for Gas, Liquid, 4 L/min Min, 5.5 L/min Max

RS Stock No. 613-4216

Brand RS Pro

Current Rating: 5 A
Maximum Media Temperature: +110°C
Media Monitored: Gas, Liquid

AED 1.545.71

in stock now

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RS PRO Paddle Flow Switch for Gas, Liquid, 5.5 L/min Min, 7 L/min Max

RS Stock No. 613-4238

Brand RS Pro

Device Type: Paddle
Material: Nickel Plated Brass
Maximum Operating Temperature: +110°C

AED 1.623.35

in stock now

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RS PRO Piston Inline Flow Switch for Liquid, 0.1 L/min Min, 0.6 L/min Max

RS Stock No. 510-0565

Brand RS Pro

Maximum Flow Rate: 0.6 L/min
Maximum Media Temperature: +100°C
Media Monitored: Liquid

AED 1.770.97

in stock now

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RS PRO Piston Inline Flow Switch for Liquid, 0.5 L/min Min, 3 L/min Max

RS Stock No. 510-0571

Brand RS Pro

Maximum Flow Rate: 3 L/min
Maximum Operating Temperature: +120°C
Media Monitored: Liquid

AED 1.840.91

in stock now

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RS PRO Paddle Flow Switch for Gas, Liquid, 7.5 L/min Min, 10 L/min Max

RS Stock No. 613-4222

Brand RS Pro

Material: Nickel Plated Brass
Maximum Media Temperature: +110°C
Maximum Pressure: 25bar

AED 1.681.04

in stock now

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RS PRO Paddle Flow Switch for Gas, Liquid, 14 L/min Min, 18 L/min Max

RS Stock No. 613-4244

Brand RS Pro

Connection Type: 1 BSP Female
Minimum Flow Rate: 14 L/min
Supply Voltage: 250 V ac

AED 2.027.02

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RS PRO Handle Micro Valve GHILUX 6400 Series, III B

RS Stock No. 176-2146

Brand RS Pro

Height: 22mm
Super Section: Pneumatic Valves
Width: 19 mm

AED 1.007.78

in stock now

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RS PRO Push Pull Pneumatic Manual Control Valve BHP Series, Push-in 4 mm, III B

RS Stock No. 784-0072

Brand RS Pro

Control Button/Switch Colour: Red
Control Mechanism: Push Pull
Maximum Operating Pressure: 16 bar

AED 329.13

in stock now

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RS PRO Handle Micro Valve GHILUX Series 3.18 mm, III B

RS Stock No. 176-2141

Brand RS Pro

Control Button/Switch Colour: Red
Thread Size: 3.175mm
Thread Standard: ISO 7

AED 606.13

in stock now

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RS PRO Toggle Pneumatic Control Valve super X manual 3/2 valve Series, G 1/8 in, III B

RS Stock No. 235-4725

Brand RS Pro

Category: Pneumatic Manual Control Valves
Valve Function: 3/2
Width: 36 mm

AED 671.07

in stock now

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RS PRO Push Pull Pneumatic Manual Control Valve ACV Series, Push-in 6 mm, III B

RS Stock No. 784-0076

Brand RS Pro

Control Mechanism: Push Pull
Number of Ports: 4/2
Thread Size: 6mm

AED 468.05

in stock now

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RS PRO Handle Micro Valve GHILUX ART. 6400 Series, BS 21, ISO 7.1, DIN 2999, ISO 228 3.18 mm, III B

RS Stock No. 176-2138

Brand RS Pro

Category: Pneumatic Manual Control Valves
Control Button/Switch Colour: Red
Maximum Operating Temperature: +80°C

AED 606.13

in stock now

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RS PRO Handle Micro Valve GHILUX 6400 Series, BS 21, DIN 2999, ISO 228, ISO 7.1 9.53 mm, III B

RS Stock No. 176-2140

Brand RS Pro

Maximum Flow Rate: 3.1m³/h
Minimum Operating Temperature: -20°C
Thread Size: 9.525mm

AED 663.43

in stock now

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RS PRO Handle Micro Valve GHILUX ART. 6400 Series, ISO 7.1, DIN 2999, BS 21, ISO 228, III B

RS Stock No. 176-2145

Brand RS Pro

Body Material: Brass
Maximum Operating Pressure: 20 bar
Minimum Operating Temperature: -20°C

AED 959.53

in stock now

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RS PRO Handle Micro Valve GHILUX Series 6.35 mm, III B

RS Stock No. 176-2142

Brand RS Pro

Category: Pneumatic Manual Control Valves
Number of Ports: 2
Thread Size: 6.35mm

AED 633.65

in stock now

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RS PRO Plunger Pneumatic Control Valve super X Mechanical 3/2 valve Series, G 1/8 in, III B

RS Stock No. 235-4724

Brand RS Pro

Super Section: Pneumatic Valves
Valve Function: 3/2
Width: 36 mm

AED 555.46

in stock now

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RS PRO Toggle Pneumatic Control Valve super X manual 5/2 valve Series, G 1/8 in, III B

RS Stock No. 235-4743

Brand RS Pro

Port Size: 1/8 in
Product Type: Pneumatic Control Valve
Section: Pneumatics & Hydraulics

AED 950.87

in stock now

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RS PRO Handle Micro Valve GHILUX 6400 Series, ISO 228, BS 21, DIN 2999, ISO 7.1 6.35 mm, III B

RS Stock No. 176-2139

Brand RS Pro

Control Button/Switch Colour: Red
Maximum Operating Pressure: 20 bar
Thread Standard: ISO 7

AED 633.65

in stock now

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RS PRO Handle Micro Valve GHILUX 6400 Series, ISO 7.1, DIN 2999, ISO 228, BS 21 9.53 mm, III B

RS Stock No. 176-2143

Brand RS Pro

Connection Port Thread: R 3/8
Maximum Operating Pressure: 20 bar
Minimum Operating Temperature: -20°C

AED 656.35

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RS PRO Handle Micro Valve GHILUX ART. 6400 Series, BS 21, DIN 2999, ISO 7.1, ISO 228, III B

RS Stock No. 176-2144

Brand RS Pro

Body Material: Brass
Connection Thread Standard: BS 21, DIN 2999, ISO 7.1, ISO 228
Valve Function: 2/3 Way

AED 909.47

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SMC Flow Switch Series Digital Flow Switch Flow Switch for Dry Air, N2, 30 L/min Min, 3000 L/min Max

RS Stock No. 281-0919

Brand SMC

Maximum Flow Rate: 3000 L/min
Media Monitored: Dry Air, N2
Minimum Flow Rate: 30 L/min

AED 5.095.80

in stock now

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SMC PFM7 Series Digital Flow Switch Flow Switch, 0.2 l/min Min, 10 L/min Max

RS Stock No. 270-4301

Brand SMC

Category: Flow Sensors
Maximum Flow Rate: 10 L/min
Series: PFM7

AED 1.593.18

in stock now

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Endress+Hauser DTT31 Series Thermal Flow Switch Flow Switch for Liquid, 0.03 m/s Min, 3 m/s Max

RS Stock No. 069-0253

Brand Endress+Hauser

Category Link: https://ae.rsdelivers.com/browse/electrical-automation-cables/automation-control-gear/sensors/flow-sensors
Series: DTT31
Supply Voltage: 18 → 30 V dc

AED 1.939.89

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What is a flow switch?

A flow switch is a sensor that monitors the movement of liquids or gases through a pipe or duct and generates a signal when the flow rate crosses a preset threshold. This can be used to start or stop pumps, control valves, or interlock processes to protect equipment and optimize efficiency. Flow switches come in several designs, including paddle-type (flow pushes a paddle to actuate contacts), turbine-type (a small impeller detects flow), and differential-pressure types (pressure drop across a restriction triggers a switch). They are commonly used in HVAC, plumbing, water treatment, and industrial automation.

How does a flow switch work?

A flow switch typically uses a mechanical or electrical sensing element to detect moving fluid and translate that into an electrical output. In paddle or turbine models, the moving fluid pushes a sensor or wheel, which then moves a contact from one state to another (normally open or normally closed). In differential-pressure types, a pressure drop across a flow element converts fluid motion into a measurable pressure difference that drives a switch. The result is a controllable signal that can shut off a pump, start another device, or trigger a alarm. Some models feature adjustable setpoints, hysteresis, and multiple output configurations (NO, NC, or changeover) to suit complex control schemes.

What are the main types of flow switches?

Flow switches come in several common configurations, each suited to different installations and fluids:

Paddle (or vane) flow switch: A flat paddle or vane is pushed by the flowing fluid to actuate a switch. Ideal for clean liquids and straightforward installation.
Turbine (or impeller) flow switch: An inline turbine spins with the flow; rotation triggers the switch. Suitable for higher flow rates and precise control.
Differential-pressure flow switch: A restriction creates a pressure difference that is monitored by a sensor; changes in flow alter the differential pressure and switch state.
Magnetic or reed switch flow switch: A magnetically actuated sensor detects flow without direct contact, useful in sanitary or low-leakage applications.
Ultrasonic or thermal flow switches (less common as discrete options): Use flow-induced changes in transit time, density, or heat transfer for switching in special environments.

Where are flow switches used?

Flow switches are versatile for both safety interlocks and control loops across many industries:

HVAC systems to start/stop circulation pumps based on differential flow in heating or cooling loops
Water treatment and filtration plants for pump protection and backflow prevention
Industrial automation lines where process sequences depend on fluid movement
Plumbing systems to guard against dry-running of pumps
Chemical processing and pharmaceutical manufacture where sanitary, compliant sensing is required
Food and beverage processing where clean-in-place (CIP) compatibility is important
Oil and gas, petrochemical, and power generation applications with robust environmental ratings

How do I choose the right flow switch?

Selecting the right flow switch involves matching the device to your process, pipe size, and media. Consider:

Ensure the switch activates at the operational flow rate required by the control system.
Materials (stainless steel, PVC, brass), seals, and coatings must resist the process fluid (water, oil, chemicals, slurry).
Choose ratings that exceed process conditions to avoid failure.
Output type (NO/NC, changeover), contact rating, and supply voltage must match the controller or PLC.
Straight-run length, presence of elbows, and accessibility for maintenance.
For outdoor or hazardous environments, select appropriate enclosure protection (IP ratings) and certifications (CE, RoHS, ATEX/IECEx if applicable).
Some switches require periodic calibration or cleaning, especially paddle and turbine types in dirty systems.

How do I install and wire a flow switch?

Installation and wiring vary by model, but general guidelines help ensure reliable operation:

Turn off power to the control circuit and depressurize the line before installation.
Install in a straight section of pipe with adequate straight-run distance before and after the sensor to avoid turbulence.
Choose the correct orientation and connection type (threaded, flanged, or compression) for your piping system.
Use appropriate gaskets, seals, and torque specifications to prevent leaks or motion-induced wear.
Connect the output to the correct input on the control system or PLC, observing NO/NC configuration and any required pull-up or pull-down resistors.
Verify electrical ratings, supply voltage, and safety certifications; if the switch is explosion-proof or weather-proof, ensure proper enclosure is used.
Once mounted, test with a known flow condition and confirm that the controller responds as intended, adjusting setpoints if available.

How do I troubleshoot a flow switch that isn’t responding?

Troubleshooting steps help identify common causes of non-responsiveness:

Check power and wiring: confirm supply, correct grounding, and that the control inputs match the switch output (NO/NC).
Inspect the sensing element: paddle or turbine can jam with debris, scale, or sediment; clean or replace if necessary.
Verify setpoint and hysteresis: ensure the adjustable range aligns with the actual flow in the system.
Look for leaks or incorrect installation: misalignment or air ingress can affect readings, especially in differential-pressure switches.
Test with a simulated flow source: bypass or temporarily increase flow to confirm switch activation.
Check for electrical interference or wiring damage that could mask signals or trigger spurious outputs.
Ensure the media temperature and chemical compatibility have not degraded seals or sensor components.

What maintenance and replacement considerations apply to flow switches?

Regular maintenance extends the service life and reliability of flow switches:

Periodic cleaning of the sensing element to prevent buildup that reduces sensitivity.
Inspection of seals, gaskets, and enclosure integrity to maintain IP/ATEX ratings where required.
Calibration checks and, if available, recalibration according to the manufacturer’s schedule or process requirements.
Replacement of worn or damaged parts, such as paddle blades, impellers, or reed contacts, to preserve accurate switching.
Verification of electrical connections and corrosion-resistant fittings in aggressive environments.
Documentation of changes for process history and quality standards in regulated industries.

What related components should I consider with a flow switch?

Flow switches are often part of a broader instrumentation and control package. Consider these compatible components:

Flow meters and flow sensors for precise measurement alongside switching actions
Differential-pressure transmitters and pressure switches for multi-point control
Valves, actuators, and pumps with compatible electrical interfaces
Filters, strainers, and strainers upstream to protect the sensing element
Tubing, fittings, and seals designed for the process fluid and temperature
Control relays, PLCs, and safety interlocks with appropriate input ratings
Sanitary and hygienic versions for food, beverage, or pharmaceutical lines

Are flow switches suitable for hazardous environments or special certifications?

Yes, many flow switches are designed for demanding applications and offer certifications for specific environments:

Explosion-proof or intrinsically safe variants for hazardous areas
ATEX and IECEx certifications where required by local regulations
IP65/IP66 or higher ingress protection for washdown and outdoor installations
Materials compatible with aggressive chemicals or high-temperature media
Compliance with industry standards such as CE, UL, CSA, RoHS, and REACH

Switches Legrand switches Flow meter Schneider switch Isolator switches Eaton e series Static type pro Castrol Greases Werma kombisign 71 Screwdriver nut driver set

"Flow switch"

RS PRO Piston Inline Flow Switch for Liquid, 0.04 L/min Min, 0.13 L/min Max

RS PRO Paddle Flow Switch for Gas, Liquid, 4 L/min Min, 5.5 L/min Max

RS PRO Paddle Flow Switch for Gas, Liquid, 5.5 L/min Min, 7 L/min Max

RS PRO Piston Inline Flow Switch for Liquid, 0.1 L/min Min, 0.6 L/min Max

RS PRO Piston Inline Flow Switch for Liquid, 0.5 L/min Min, 3 L/min Max

RS PRO Paddle Flow Switch for Gas, Liquid, 7.5 L/min Min, 10 L/min Max

RS PRO Paddle Flow Switch for Gas, Liquid, 14 L/min Min, 18 L/min Max

RS PRO Handle Micro Valve GHILUX 6400 Series, III B

RS PRO Push Pull Pneumatic Manual Control Valve BHP Series, Push-in 4 mm, III B

RS PRO Handle Micro Valve GHILUX Series 3.18 mm, III B

RS PRO Toggle Pneumatic Control Valve super X manual 3/2 valve Series, G 1/8 in, III B

RS PRO Push Pull Pneumatic Manual Control Valve ACV Series, Push-in 6 mm, III B

RS PRO Handle Micro Valve GHILUX ART. 6400 Series, BS 21, ISO 7.1, DIN 2999, ISO 228 3.18 mm, III B

RS PRO Handle Micro Valve GHILUX 6400 Series, BS 21, DIN 2999, ISO 228, ISO 7.1 9.53 mm, III B

RS PRO Handle Micro Valve GHILUX ART. 6400 Series, ISO 7.1, DIN 2999, BS 21, ISO 228, III B

RS PRO Handle Micro Valve GHILUX Series 6.35 mm, III B

RS PRO Plunger Pneumatic Control Valve super X Mechanical 3/2 valve Series, G 1/8 in, III B

RS PRO Toggle Pneumatic Control Valve super X manual 5/2 valve Series, G 1/8 in, III B

RS PRO Handle Micro Valve GHILUX 6400 Series, ISO 228, BS 21, DIN 2999, ISO 7.1 6.35 mm, III B

RS PRO Handle Micro Valve GHILUX 6400 Series, ISO 7.1, DIN 2999, ISO 228, BS 21 9.53 mm, III B

RS PRO Handle Micro Valve GHILUX ART. 6400 Series, BS 21, DIN 2999, ISO 7.1, ISO 228, III B

SMC Flow Switch Series Digital Flow Switch Flow Switch for Dry Air, N2, 30 L/min Min, 3000 L/min Max

SMC PFM7 Series Digital Flow Switch Flow Switch, 0.2 l/min Min, 10 L/min Max

Endress+Hauser DTT31 Series Thermal Flow Switch Flow Switch for Liquid, 0.03 m/s Min, 3 m/s Max

What is a flow switch?

How does a flow switch work?

What are the main types of flow switches?

Where are flow switches used?

How do I choose the right flow switch?

How do I install and wire a flow switch?

How do I troubleshoot a flow switch that isn’t responding?

What maintenance and replacement considerations apply to flow switches?

What related components should I consider with a flow switch?

Are flow switches suitable for hazardous environments or special certifications?