Flow Switches

pA 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./p h2Common types of flow switches/h2 ulliWater: uses a paddle (physical or ultrasonic), for water pumps and sprinklers. /li liGas and air: HVAC and ducting, paddle air, boilers, inline air flow switches/li liThermal 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./li liOil: can operate at higher temperatures with robust seals and housing./li liUltrasonic, 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/li liMechanical: need to be tested regularly as continual movements of parts will lead to wear and tear./li liPVC: basic type ideal where a quick visual confirmation of flow/no flow status is needed. Designed for cleaning and maintenance./li liIndustrial: larger more robust so can withstand higher volumes, pressure and flow rates, designed for heavily contaminated or hazardous materials./li liPneumatic: for applications where there is a necessary pressure differential between different areas of ducting./li liAdjustable: quickly and easily recalibrate the desired flow settings/li liRotary: functions as a basic turbine, ideal for low flow liquid monitoring./li/ul h2Some basic rules to install a flow switch:/h2 ulliInstall on a straight section of pipe or duct/li liMake sure there is a good length of straight pipe in front and behind the switch/li liAvoid fitting or wiring near to bends, other fittings, valves, drains, narrower or wider sections of pipe/li/ul pEach 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./p

...
Read more Read less

Filters

Viewing 1 - 20 of 52 products
Results per page
Description Price 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 Stock No. 613-4244
BrandRS PRO
£158.27
Each
Units
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 Stock No. 613-4238
BrandRS PRO
£139.07
Each
Units
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 Stock No. 613-4222
BrandRS PRO
£140.35
Each
Units
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 Stock No. 613-4216
BrandRS PRO
£132.42
Each
Units
Gas, Liquid Paddle 4 L/min 5.5 L/min 250 V ac 10 mm 3/8 BSP Female 25bar Nickel Plated Brass - +110°C - +110°C 5 A
RS Stock No. 256-578
£50.44
Each
Units
Liquid Control Valve 3 L/min 6 L/min 240 V ac 22 mm - 10bar - +5 °C +85°C +5°C +70°C -
RS Stock No. 256-562
£36.57
Each
Units
Liquid Control Valve 3 L/min 6 L/min 240 V ac 15 mm - 8bar - +5 °C +85°C +5°C +70°C -
RS Stock No. 395-7173
Mfr. Part No.020-0315
£113.70
Each
Units
Liquid Piston 0 L/min 55 L/min 220 V 3/8 in 3/8 BSP 0.3bar Brass - - - +90°C -
RS Stock No. 395-6940
Mfr. Part No.166701
£35.80
Each
Units
Liquid Piston - 0.2 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS Stock No. 395-7224
Mfr. Part No.020-3499
£286.40
Each
Units
Liquid Paddle 15 L/min 125 L/min 250 V 1 in 1 BSP 55bar Stainless Steel - - -18°C +100°C -
RS Stock No. 780-0273
Mfr. Part No.FSP10A30
BrandCynergy3
£79.41
Each
Units
Liquid In-line - 80 L/min 250 V ac G1 1 BSP 8bar Brass/Polyamide - +85°C - +85°C 10 A
RS Stock No. 744-0714
Mfr. Part No.PFM725S-C6-B-W
BrandSMC
£208.20
Each
Units
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 Stock No. 395-6978
Mfr. Part No.166703
£35.80
Each
Units
Liquid Piston - 2 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS Stock No. 906-7743
Mfr. Part No.V4-SS-2-U
£385.48
Each
Units
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 Stock No. 744-0701
Mfr. Part No.PFM710S-C4-B-W
BrandSMC
£208.20
Each
Units
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 Stock No. 906-7734
Mfr. Part No.V4-2-U
£267.33
Each
Units
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 69bar Brass -20 °C +73°C -20°C +73°C 10 A
RS Stock No. 849-9394
Mfr. Part No.PFMB7201-C8-A-M
BrandSMC
£210.92
Each
Units
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 -
RS Stock No. 906-7702
Mfr. Part No.TDFS-1-P-06
£154.08
Each
Units
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 Stock No. 395-7230
Mfr. Part No.020-3497
£227.10
Each
Units
Liquid Paddle 15 L/min 125 L/min 250 V 1 in 1 BSP 55bar Brass - - -18°C +100°C -
RS Stock No. 395-7195
Mfr. Part No.020-3489
£208.10
Each
Units
Liquid Shuttle 3 L/min 22.5 L/min 250 V 1 in 1 BSP 27bar Bronze - - -20°C +80°C -
RS Stock No. 395-6990
Mfr. Part No.166701-A
£35.80
Each
Units
Gas Piston - 28 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
Related Products
Provides accurate flow detection in water and oil ...
Description:
Provides accurate flow detection in water and oil with 1% repeatability. Flow settings on the adjustable version can be easily changed without disassembly. A shuttle by-pass vane inside the housing is controlled externally using an ordinary flat-blade screwdriver. These switches are rigorously tested and constructed of non-corrosive materials resistant to ...
A unique, patented piston design assures accuracy within ...
Description:
A unique, patented piston design assures accuracy within 20% over a full range of viscosities - from 40 to 1000 SSU. Ideal for use in applications where liquids of different viscosities are blended; or for use in lubrication systems where oil flow monitoring is critical at start-ups. Switch compensates for ...
Requires a remote signal processor to operate, see ...
Description:
Requires a remote signal processor to operate, see stock no 313-2526 or 313-2532 (Available in most markets)Pressure rating up to 60 bar static; 100 bar dynamicFluid temperature range: –25 to +80°C (100°C for 10 minutes maximum)On delay time: 8s typicalSwitch on time: 2sResponse time: 12s maximumStainless steel housingIngress protection to ...
These ultra compact switches have been specially designed ...
Description:
These ultra compact switches have been specially designed for reliable operation in clean post-filtered water. FS-3 switches are instrument quality, yet affordably priced for pure water equipment, from UV lamp switching to filter life monitoring. Also suited to some chemical applications and various cooling applications. • 0.2 l/min - 3.8 ...