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. 907-3928
Fabrikantnummer70824
FabrikantGems Sensors
119,25 €
Each
Aantal stuks
Liquid Piston - 1 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +93.3°C -
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. 906-8327
Fabrikantnummer197082
FabrikantGems Sensors
64,50 €
Each
Aantal stuks
Liquid Piston - 0.5 gal/min - 3/8 in 3/8 NPT 8.6bar Glass Reinforced Polypropylene - +21°C -18°C +100°C -
RS-stocknr. 395-6962
Fabrikantnummer166702
FabrikantGems Sensors
43,50 €
Each
Aantal stuks
Liquid Piston - 1 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS-stocknr. 907-3748
Fabrikantnummer26615
FabrikantGems Sensors
254,34 €
Each
Aantal stuks
Liquid Shuttle 1 gal/min 6 gal/min - 1 in 1 NPT Female 27.6bar Bronze, Stainless Steel - +37.8°C -29°C +93.3°C -
RS-stocknr. 906-8086
Fabrikantnummer129660
FabrikantGems Sensors
105,87 €
Each
Aantal stuks
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 -
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. 906-8106
Fabrikantnummer135805
FabrikantGems Sensors
98,57 €
Each
Aantal stuks
Fluid, Liquid Shuttle - 0.5 gal/min - 1/2 in 1/2 NPT Female 8.3bar PVC +21 °C +37.8°C - +48.9°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. 395-6990
Fabrikantnummer166701-A
FabrikantGems Sensors
43,50 €
Each
Aantal stuks
Gas Piston - 28 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS-stocknr. 906-8430
Fabrikantnummer216445
FabrikantGems Sensors
64,50 €
Each
Aantal stuks
Liquid Piston - 0.08 gal/min - 3/8 in 3/8 NPT 8.6bar Glass Reinforced Polypropylene - +21°C -18°C +100°C -
RS-stocknr. 122-8442
Fabrikantnummer51586
FabrikantGems Sensors
285,40 €
Each
Aantal stuks
Liquid Piston - 0.25 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +148.9°C -
RS-stocknr. 395-6978
Fabrikantnummer166703
FabrikantGems Sensors
43,50 €
Each
Aantal stuks
Liquid Piston - 2 L/min 120 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS-stocknr. 395-7218
Fabrikantnummer020-3490
FabrikantGems Sensors
307,00 €
Each
Aantal stuks
Liquid Shuttle 19 L/min 57 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C -
RS-stocknr. 122-8438
Fabrikantnummer26600
FabrikantGems Sensors
252,04 €
Each
Aantal stuks
Liquid AdjustableShuttle 0.75 gal/min 4 gal/min - - 3/4 NPT Female 27.6bar Bronze - - -29°C +82.2°C -
RS-stocknr. 122-8443
Fabrikantnummer51590
FabrikantGems Sensors
285,40 €
Each
Aantal stuks
Liquid Piston - 0.5 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +148.9°C -
RS-stocknr. 122-8439
Fabrikantnummer26601
FabrikantGems Sensors
252,04 €
Each
Aantal stuks
Liquid AdjustableShuttle 2 gal/min 8 gal/min - 3/4 in 3/4 NPT Female 27.6bar Bronze - - -29°C +82.2°C -
RS-stocknr. 616-3494
Fabrikantnummer197093
FabrikantGems Sensors
50,65 €
Each
Aantal stuks
Liquid Piston - 1 gal/min 200 V 1/4 in 1/4 Quick Disconnect Male 8.6bar Glass Reinforced PP -18 °C +100°C -18°C +100°C -
RS-stocknr. 395-6940
Fabrikantnummer166701
FabrikantGems Sensors
43,50 €
Each
Aantal stuks
Liquid Piston - 0.2 L/min 120 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS-stocknr. 906-8282
Fabrikantnummer179995
FabrikantGems Sensors
340,74 €
Each
Aantal stuks
Liquid Piston - 1.5 gal/min - 3/8 in 3/8 NPT Male 107bar Stainless Steel - - -28.8°C +135°C -