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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Description Prix 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
N° de stock RS 780-0289
Référence fabricantFSVPLC06
MarqueCynergy3
79,60 €
Each
Unité
Liquid In-line 0.6 L/min 80 L/min 5 V ac G1 1 BSP Female 8bar Brass - +85°C - +85°C -
N° de stock RS 744-0913
Référence fabricantPFM710S-C4-A-W
MarqueSMC
224,42 €
Each
Unité
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 -
N° de stock RS 907-3928
Référence fabricant70824
MarqueGems Sensors
119,25 €
Each
Unité
Liquid Piston - 1 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +93.3°C -
N° de stock RS 510-0571
MarqueRS PRO
223,76 €
Each
Unité
Liquid Piston Inline 0.5 L/min 3 L/min 200 V ac 1/4 in 1/4 BSP 300bar Brass - +100°C - +120°C 1 A
N° de stock RS 613-4238
MarqueRS PRO
180,80 €
Each
Unité
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
N° de stock RS 613-4222
MarqueRS PRO
182,44 €
Each
Unité
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
N° de stock RS 906-7746
Référence fabricantV8
75,07 €
Each
Unité
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
N° de stock RS 256-578
66,89 €
Each
Unité
Liquid Control Valve 3 L/min 6 L/min 240 V ac 22 mm - 10bar - +5 °C +85°C +5°C +70°C -
N° de stock RS 613-4244
MarqueRS PRO
205,74 €
Each
Unité
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
N° de stock RS 744-0701
Référence fabricantPFM710S-C4-B-W
MarqueSMC
226,41 €
Each
Unité
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 -
N° de stock RS 395-6984
Référence fabricant166704
MarqueGems Sensors
43,50 €
Each
Unité
Liquid Piston - 3.8 L/min 120 → 240 V ac/dc 1/4 in R 1/4" 10bar Noryl - +100°C - +100°C -
N° de stock RS 849-9398
Référence fabricantPFM711-N02L-A-A
MarqueSMC
267,47 €
Each
Unité
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 -
N° de stock RS 906-7743
Référence fabricantV4-SS-2-U
511,31 €
Each
Unité
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
N° de stock RS 906-7740
Référence fabricantV8-WP
103,07 €
Each
Unité
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
N° de stock RS 744-0705
Référence fabricantPFM725S-C6-A-W
MarqueSMC
224,42 €
Each
Unité
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 -
N° de stock RS 906-7702
Référence fabricantTDFS-1-P-06
204,37 €
Each
Unité
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
N° de stock RS 849-9394
Référence fabricantPFMB7201-C8-A-M
MarqueSMC
535,27 €
Each
Unité
Air, Gas Integrated Display 2 L/min 200 L/min 12 → 24 V dc 8 mm One-Touch Fitting 0.7MPa PBT 0 °C +50°C 0°C +50°C -
N° de stock RS 510-0565
MarqueRS PRO
223,76 €
Each
Unité
Liquid Piston Inline 0.1 L/min 0.6 L/min 200 V ac 1/4 in 1/4 BSP 300bar Brass - +100°C - +120°C 1 A
N° de stock RS 906-8086
Référence fabricant129660
MarqueGems Sensors
105,87 €
Each
Unité
Liquid Piston - 0.5 gal/min - 1/2 in 1/2 NPT Male 13.8bar Polypropylene +21.1 °C +65.5°C -17.8°C +100°C -
N° de stock RS 906-7734
Référence fabricantV4-2-U
354,59 €
Each
Unité
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