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

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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. 613-4238
BrandRS PRO
SGD248.74
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. 613-4216
BrandRS PRO
SGD248.45
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. 613-4244
BrandRS PRO
SGD283.04
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. 613-4222
BrandRS PRO
SGD263.34
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. 744-0714
Mfr. Part No.PFM725S-C6-B-W
BrandSMC
SGD430.08
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. 395-6990
Mfr. Part No.166701-A
SGD64.22
Each
units
Gas Piston - 28 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS Stock No. 744-0705
Mfr. Part No.PFM725S-C6-A-W
BrandSMC
SGD426.34
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. 395-6940
Mfr. Part No.166701
SGD49.03
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. 780-0289
Mfr. Part No.FSVPLC06
BrandCynergy3
SGD137.35
Each
units
Liquid In-line 0.6 L/min 80 L/min 5 V ac G1 1 BSP Female 8bar Brass - +85°C - +85°C -
RS Stock No. 395-7016
Mfr. Part No.166703-A
SGD52.87
Each
units
Gas Piston - 158 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS Stock No. 395-7000
Mfr. Part No.166702-A
SGD77.40
Each
units
Gas Piston - 74 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
SGD443.83
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. 906-7743
Mfr. Part No.V4-SS-2-U
SGD775.62
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. 395-7038
Mfr. Part No.166704-A
SGD52.87
Each
units
Gas Piston - 340 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
RS Stock No. 395-6978
Mfr. Part No.166703
SGD64.22
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. 395-7195
Mfr. Part No.020-3489
SGD358.19
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. 849-9405
Mfr. Part No.PFM711S-N02L-E-M
BrandSMC
SGD401.92
Each
units
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 -
RS Stock No. 744-0701
Mfr. Part No.PFM710S-C4-B-W
BrandSMC
SGD369.24
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. 849-9394
Mfr. Part No.PFMB7201-C8-A-M
BrandSMC
SGD398.17
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. 395-7173
Mfr. Part No.020-0315
SGD241.56
Each
units
Liquid Piston 0 L/min 55 L/min 220 V 3/8 in 3/8 BSP 0.3bar Brass - - - +90°C -
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