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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Beskrivning Pris 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-artikelnummer 780-0125
Tillv. art.nrLFS-04
VarumärkeCynergy3
2 382,23 kr
Each
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- 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-artikelnummer 122-8440
Tillv. art.nr26602
VarumärkeGems Sensors
2 570,52 kr
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Liquid AdjustableShuttle 7 gal/min 14 gal/min - 3/4 in 3/4 NPT Female 27.6bar Bronze - - -29°C +82.2°C -
RS-artikelnummer 906-7746
Tillv. art.nrV8
VarumärkeDWYER INSTRUMENTS
744,91 kr
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Gas, Liquid Vane Operated 10.8 (Liquid) gal/min, 39 (Gas) gal/min 168.6 (Gas) gal/min, 45 (Liquid) gal/min 120/250 V ac 1 → 6 in 1 NPT Male 10.34bar Polyphenylene - - - +100°C 5 A
RS-artikelnummer 395-7195
Tillv. art.nr020-3489
VarumärkeGems Sensors
3 269,51 kr
Each
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Liquid Shuttle 3 L/min 22.5 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C -
RS-artikelnummer 616-3472
Tillv. art.nr197091
VarumärkeGems Sensors
539,75 kr
Each
Enheter
Liquid Piston - 0.25 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-artikelnummer 906-8430
Tillv. art.nr216445
VarumärkeGems Sensors
434,49 kr
Each
Enheter
Liquid Piston - 0.08 gal/min - 3/8 in 3/8 NPT 8.6bar Glass Reinforced Polypropylene - +21°C -18°C +100°C -
RS-artikelnummer 907-3928
Tillv. art.nr70824
VarumärkeGems Sensors
1 104,31 kr
Each
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Liquid Piston - 1 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +93.3°C -
RS-artikelnummer 395-6962
Tillv. art.nr166702
VarumärkeGems Sensors
463,23 kr
Each
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Liquid Piston - 1 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS-artikelnummer 395-7202
Tillv. art.nr020-3491
VarumärkeGems Sensors
3 269,51 kr
Each
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Liquid Shuttle 7.5 L/min 30 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C -
RS-artikelnummer 395-7016
Tillv. art.nr166703-A
VarumärkeGems Sensors
463,23 kr
Each
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Gas Piston - 158 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS-artikelnummer 906-8294
Tillv. art.nr181130
VarumärkeGems Sensors
801,35 kr
Each
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Liquid Piston - 0.15 gal/min - 3/8 in 3/8 NPT Male 107bar Brass - - -28.8°C +135°C -
RS-artikelnummer 907-3830
Tillv. art.nr29609
VarumärkeGems Sensors
2 431,97 kr
Each
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Liquid Paddle 15 gal/min 52 gal/min - 1 in 1 NPT Male 138bar Brass - - -34.4°C +148.9°C -
RS-artikelnummer 122-8441
Tillv. art.nr51582
VarumärkeGems Sensors
3 039,96 kr
Each
Enheter
Liquid Piston - 0.1 gal/min - 1/4 in 1/4 NPT Female 69bar Brass - - -29°C +148.9°C -
RS-artikelnummer 616-3488
Tillv. art.nr197092
VarumärkeGems Sensors
539,75 kr
Each
Enheter
Liquid Piston - 0.5 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-artikelnummer 906-7743
Tillv. art.nrV4-SS-2-U
VarumärkeDWYER INSTRUMENTS
5 073,78 kr
Each
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Air, Liquid Vane Operated 32 (Air) gal/min, 8 (liquid) 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-artikelnummer 313-2475
Tillv. art.nrFCS-G1/2A4-NA-H1141
VarumärkeTurck
1 822,48 kr
Each
Enheter
Gas, Liquid Remote Sensor 1 (Water) ccm/s, 2 (Air) ccm/s, 3 (Oil) ccm/s 150 (Water) cm³/s, 30 (Air) cm³/s, 300 (Oil) cm³/s - 1/2 in 1/2 BSP 100bar Stainless Steel -25 °C +80°C -25°C +80°C -
RS-artikelnummer 744-0717
Tillv. art.nrPFM750S-C8-A-W
VarumärkeSMC
2 387,01 kr
Each
Enheter
Dry Air, Gas Integrated Display 1 L/min 50 L/min 24 V dc 8 mm One-Touch Fitting 750kPa PBT 0 °C +50°C 0°C +50°C -
RS-artikelnummer 906-7740
Tillv. art.nrV8-WP
VarumärkeDWYER INSTRUMENTS
1 022,72 kr
Each
Enheter
Gas, Liquid Vane Operated 10.8 (Liquid) gal/min, 39 (Gas) gal/min 168.6 (Gas) gal/min, 45 (Liquid) gal/min 120/250 V ac 1 → 6 in 1 NPT Male 10.34bar Polyphenylene - - - +100°C 5 A
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