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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Rincian Komponen Brand Stock 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 Series Current Rating
Water low flow switch,0.2 l/min
  • S$ 49,03
  • Each
  • Compare
Gems Sensors 170 Liquid Piston - 0.2 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C FS-3 -
Water low flow switch,1.9 l/min
  • S$ 64,22
  • Each
  • Compare
Gems Sensors 127 Liquid Piston - 2 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C FS-3 -
SPCO high power flow switch,15mm dia
  • S$ 61,42
  • Each
  • Compare
Novotech Controls 106 Liquid Control Valve 3 L/min 6 L/min 240 V ac 15 mm - 8bar - +5 °C +85°C +5°C +70°C SPCO -
Air low flow switch,12 l/min at 0.35 bar
  • S$ 64,22
  • Each
  • Compare
Gems Sensors 64 Gas Piston - 28 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C FS-3 -
Water low flow switch,1 l/min
  • S$ 52,87
  • Each
  • Compare
Gems Sensors 61 Liquid Piston - 1 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C FS-3 -
SPCO high power flow switch,22mm dia
  • S$ 97,71
  • Each
  • Compare
Novotech Controls 48 Liquid Control Valve 3 L/min 6 L/min 240 V ac 22 mm - 10bar - +5 °C +85°C +5°C +70°C SPCO -
Air low flow switch,140l/min at 0.35 bar
  • S$ 52,87
  • Each
  • Compare
Gems Sensors 30 Gas Piston - 340 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C FS-3 -
Adjustable flow switch,19-57 l/min
  • S$ 340,28
  • Each
  • Compare
Gems Sensors 25 Liquid Shuttle 19 L/min 57 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C FS-200E-A -
Paddle flow switch, G3/4, 7.5 - 10 l/min
  • S$ 263,34
  • Each
  • Compare
RS Pro 17 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
Adjustable flow switch,3-22.5 l/min
  • S$ 358,19
  • Each
  • Compare
Gems Sensors 16 Liquid Shuttle 3 L/min 22.5 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C FS-200E-A -
Adj low flow switch,1-55 l/min flowrange
  • S$ 241,56
  • Each
  • Compare
Gems Sensors 14 Liquid Piston 0 L/min 55 L/min 220 V 3/8 in 3/8 BSP 0.3bar Brass - - - +90°C FS-100E-A -
Flow switch, inline, G1, 0.6 l/min PLC
  • S$ 137,35
  • Each
  • Compare
Cynergy3 14 Liquid In-line 0.6 L/min 80 L/min 5 V ac G1 1 BSP Female 8bar Brass - +85°C - +85°C FSVPLC -
Paddle flow switch, G1, 14 - 18 l/min
  • S$ 283,04
  • Each
  • Compare
RS Pro 14 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
Paddle flow switch, G1/2, 5.5 - 7 l/min
  • S$ 248,74
  • Each
  • Compare
RS Pro 14 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
Air low flow switch,28 l/min at 0.35 bar
  • S$ 77,40
  • Each
  • Compare
Gems Sensors 12 Gas Piston - 74 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C FS-3 -
SPDT s/steel V mount flow/no-flow switch
  • S$ 443,83
  • Each
  • Compare
Gems Sensors 12 Liquid Paddle 15 L/min 125 L/min 250 V 1 in 1 BSP 55bar Stainless Steel - - -18°C +100°C FS-550E -
Water low flow switch,3.8 l/min
  • S$ 64,22
  • Each
  • Compare
Gems Sensors 10 Liquid Piston - 3.8 L/min 120 → 240 V ac/dc 1/4 in R 1/4" 10bar Noryl - +100°C - +100°C FS-3 -
Air low flow switch,70 l/min at 0.35 bar
  • S$ 52,87
  • Each
  • Compare
Gems Sensors 9 Gas Piston - 158 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C FS-3 -
Digital Flow Switch, 2 Colour Display
  • S$ 398,17
  • Each
  • Compare
  • No. Stok RS 849-9394
  • Merek SMC
  • Pbrk. No. Komp. PFMB7201-C8-A-M
SMC 9 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 PFMB7 -
Paddle flow switch, SS, 1NPT
  • S$ 300,79
  • Each
  • Compare
Cynergy3 9 - 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 +150°C LFS 1 A
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