Flow Switches

A flow switch are flowmeter devices used to measure the flow rate and pressure of liquid, gas or vapour that passes through them. They measure flow rates over a set time, or they can continually measure the medium passed through. They operate by sending signals to another component elsewhere in the system (e.g. pumps) telling it to stop/start in order to adjust flow rate and pressure to the desired and programmed levels.


Common types of flow switches


  • Water: uses a paddle (physical or ultrasonic), for water pumps and sprinklers.

  • Gas and air: HVAC and ducting, paddle air, boilers, inline air flow switches

  • Thermal dispersion: involves a sensor probe, allows the rate of gas or liquid flow to be calculated according to how quickly heat is carried away by the molecules flowing past.

  • Oil: can operate at higher temperatures with robust seals and housing.

  • Ultrasonic, Magnetic: emits an ultrasonic signal to the medium, this is then bounced back and converted by the primary device. Commonly used in dirty applications such as wastewater

  • Mechanical: need to be tested regularly as continual movements of parts will lead to wear and tear.

  • PVC: basic type ideal where a quick visual confirmation of flow/no flow status is needed. Designed for cleaning and maintenance.

  • Industrial: larger more robust so can withstand higher volumes, pressure and flow rates, designed for heavily contaminated or hazardous materials.

  • Pneumatic: for applications where there is a necessary pressure differential between different areas of ducting.

  • Adjustable: quickly and easily recalibrate the desired flow settings

  • Rotary: functions as a basic turbine, ideal for low flow liquid monitoring.

Some basic rules to install a flow switch:


  • Install on a straight section of pipe or duct

  • Make sure there is a good length of straight pipe in front and behind the switch

  • Avoid fitting or wiring near to bends, other fittings, valves, drains, narrower or wider sections of pipe

Each type of flow switch has its own specific applications and installation constraints. The way to select the right one is to think about the application as a guide, not the technology. Starting with the application, will help to select the technology based on accuracy, cost, durability and reliability, rather than trying to make the technology fit the application you have.


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Omschrijving Prijs Media Monitored Device Type Minimum Flow Rate Maximum Flow Rate Supply Voltage Pipe Diameter Range Connection Type Maximum Pressure Material Minimum Media Temperature Maximum Media Temperature Minimum Operating Temperature Maximum Operating Temperature Current Rating
RS-stocknr. 780-0289
FabrikantnummerFSVPLC06
FabrikantCynergy3
79,60 €
Each
Aantal stuks
Liquid In-line 0.6 L/min 80 L/min 5 V ac G1 1 BSP Female 8bar Brass - +85°C - +85°C -
RS-stocknr. 744-0913
FabrikantnummerPFM710S-C4-A-W
FabrikantSMC
224,42 €
Each
Aantal stuks
Dry Air, Gas Integrated Display 0.2 L/min 10 L/min 24 V dc 4 mm One-Touch Fitting 750kPa PBT 0 °C +50°C 0°C +50°C -
RS-stocknr. 613-4238
FabrikantRS PRO
175,53 €
Each
Aantal stuks
Gas, Liquid Paddle 5.5 L/min 7 L/min 250 V ac 15 mm 1/2 BSP Female 25bar Nickel Plated Brass - +110°C - +110°C 5 A
RS-stocknr. 613-4222
FabrikantRS PRO
177,13 €
Each
Aantal stuks
Gas, Liquid Paddle 7.5 L/min 10 L/min 250 V ac 20 mm 3/4 BSP Female 25bar Nickel Plated Brass - +110°C - +110°C 5 A
RS-stocknr. 906-7740
FabrikantnummerV8-WP
103,07 €
Each
Aantal stuks
Gas, Liquid Vane Operated 10.8 (Liquid) gal/min, 39 (Gas) gal/min 45 (Liquid) gal/min, 168.6 (Gas) gal/min 120/250 V ac 1 → 6 in 1 NPT Male 10.34bar Polyphenylene - - - +100°C 5 A
RS-stocknr. 613-4244
FabrikantRS PRO
199,75 €
Each
Aantal stuks
Gas, Liquid Paddle 14 L/min 18 L/min 250 V ac 25 mm 1 BSP Female 25bar Nickel Plated Brass - +110°C - +110°C 5 A
RS-stocknr. 906-7743
FabrikantnummerV4-SS-2-U
511,31 €
Each
Aantal stuks
Air, Liquid Vane Operated 8 (liquid) gal/min, 32 (Air) gal/min 15 (liquid) gal/min, 65 (Air) gal/min 125/250 V ac 2 in 1-1/2 NPT Male 138bar Stainless Steel -20 °C +73°C -20°C +73°C 10 A
RS-stocknr. 395-6984
Fabrikantnummer166704
FabrikantGems Sensors
43,50 €
Each
Aantal stuks
Liquid Piston - 3.8 L/min 120 → 240 V ac/dc 1/4 in R 1/4" 10bar Noryl - +100°C - +100°C -
RS-stocknr. 744-0701
FabrikantnummerPFM710S-C4-B-W
FabrikantSMC
226,41 €
Each
Aantal stuks
Dry Air, Gas Integrated Display 0.2 L/min 10 L/min 24 V dc 4 mm One-Touch Fitting 750kPa PBT 0 °C +50°C 0°C +50°C -
RS-stocknr. 256-578
66,89 €
Each
Aantal stuks
Liquid Control Valve 3 L/min 6 L/min 240 V ac 22 mm - 10bar - +5 °C +85°C +5°C +70°C -
RS-stocknr. 849-9398
FabrikantnummerPFM711-N02L-A-A
FabrikantSMC
267,47 €
Each
Aantal stuks
Dry Air, Gas Integrated Display 2 L/min 100 L/min 24 V dc 1/4 in NPT 1MPa PBT 0 °C +50°C 0°C +50°C -
RS-stocknr. 906-7702
FabrikantnummerTDFS-1-P-06
204,37 €
Each
Aantal stuks
Fluid Thermal Dispersion 0.15 m/s 3 m/s 9 → 24 V dc 1/2 in 1/2 NPT Male 34.47bar Stainless Steel -15 °C +85°C -15°C +75°C 300 mA
RS-stocknr. 744-0705
FabrikantnummerPFM725S-C6-A-W
FabrikantSMC
224,42 €
Each
Aantal stuks
Dry Air, Gas Integrated Display 0.5 L/min 25 L/min 24 V dc 6 mm One-Touch Fitting 750kPa PBT 0 °C +50°C 0°C +50°C -
RS-stocknr. 780-0125
FabrikantnummerLFS-04
FabrikantCynergy3
230,39 €
Each
Aantal stuks
- Paddle 15.2 L/min, 19 L/min 60.6 L/min, 83.3 L/min 230 V 1 → 3 in 3/4 BSP 20bar Aluminium Alloy - - -30°C +150°C 1 A
RS-stocknr. 256-562
54,24 €
Each
Aantal stuks
Liquid Control Valve 3 L/min 6 L/min 240 V ac 15 mm - 8bar - +5 °C +85°C +5°C +70°C -
RS-stocknr. 395-7195
Fabrikantnummer020-3489
FabrikantGems Sensors
307,00 €
Each
Aantal stuks
Liquid Shuttle 3 L/min 22.5 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C -
RS-stocknr. 395-7202
Fabrikantnummer020-3491
FabrikantGems Sensors
307,00 €
Each
Aantal stuks
Liquid Shuttle 7.5 L/min 30 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C -
RS-stocknr. 906-7734
FabrikantnummerV4-2-U
354,59 €
Each
Aantal stuks
Air, Liquid Vane Operated 8 (liquid) gal/min, 32 (Air) gal/min 15 (liquid) gal/min, 65 (Air) gal/min 125/250 V ac 2 in 1-1/2 NPT Male 69bar Brass -20 °C +73°C -20°C +73°C 10 A
RS-stocknr. 849-9405
FabrikantnummerPFM711S-N02L-E-M
FabrikantSMC
311,60 €
Each
Aantal stuks
Dry Air, Gas Integrated Display 2 L/min 100 L/min 24 V dc 1/4 in NPT 1MPa PBT 0 °C +50°C 0°C +50°C -
RS-stocknr. 780-0119
FabrikantnummerLFS-01
FabrikantCynergy3
258,15 €
Each
Aantal stuks
- Paddle 15.2 L/min, 19 L/min 60.6 L/min, 83.3 L/min 230 V 1 → 3 in 1 NPT 20bar Aluminium Alloy - - -30°C +75°C 1 A
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