Flow Sensors, Switches & Indicators

Flow sensors and flow switches are flowmeter devices used to measure the amount of liquid, gas or vapour that passes through them. Flow sensors and switches are available as time measuring units, that measure flow rates over a set time period, or they can be totalising flow meters that continually measure the medium passed through.

Flow sensors and switches consist of a primary medium connection device, transducer and transmitter. The transducer senses the fluid that passes through the primary device. The transmitter produces an output signal from the raw transducer signal.

Types of Flow Sensor and Switch
•Ultrasonic Flow Switch: This type of flow switch 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.


•Paddlewheel Flow Sensors: One of the most common types of flow sensor. The sensors are connected to a pipe with liquid passing through and turning a paddle, the primary device calculates the speed as the paddle is turned.


•Rotaflow or Variable Area Flow Sensors: Rotaflow meters are a tapered tube and a float. It is most widely used for gases and liquids flow measurement because of its low cost, simplicity, low pressure drop and linear output.


•Magnetic-Inductive Sensors: This type of sensor detects three process categories, volumetric flow quantity, consumed quantity and medium temperature



Applications for Flow Sensors and Switches

Each type of flow sensor has its own specific applications and installation constraints. There is no one size fits all flowmeter. The way to select the right flowmeter is to think about the application as a guide, not the technology. Many of the technologies work well on many applications. 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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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. 446-8315
Mfr. Part No.173940-C-RS
£39.19
Each
Liquid Turbine 2 L/min 30 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 256-578
£47.77
Each
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. 740-6424
Mfr. Part No.SM7000
£483.16
Each
Liquid Magnetic-Inductive 0.2 L/min 50 L/min 19 → 30 V dc - M12 16bar PBT, Stainless Steel -20 °C +80°C -10°C +60°C -
RS Stock No. 198-2997
Mfr. Part No.FR2A14BVBN
£66.71
Each
Gas Variable Area 0.4 L/min 5 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 511-4772
BrandRS Pro
£35.14
Each
Liquid Beverage 0.6 L/min 10 L/min 4.5 → 24 V dc 3/8 in 3/8 Push On 10bar PVDF - - 0°C +125°C 10 mA
RS Stock No. 395-6827
Mfr. Part No.155420BSPP
£56.30
Each
Liquid RotorFlow Electronic 2 L/min 20 L/min - 1/4 in 1/4 BSP Female 6.9bar Polypropylene -29 °C +82°C -29°C +82°C -
RS Stock No. 256-562
£34.64
Each
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. 256-297
Mfr. Part No.S.800002
BrandParker
£82.16
Each
Liquid Variable Area 1.5 L/min 10 L/min - 3/4 in 3/4 BSP 10bar - - - - +60°C -
RS Stock No. 623-7933
Mfr. Part No.AWM720P1
BrandHoneywell
£109.19
Each
Dry Gas Compensated/Amplified - 200 SLPM 15 V dc 22 mm 4-Pin 25psi Plastic - - -25°C +85°C -
RS Stock No. 198-2919
Mfr. Part No.MR3A14BVBN
£60.22
Each
Gas Variable Area 0.4 L/min 5 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 257-133
BrandRS Pro
£31.95
Each
Liquid Radial Flow Turbine 1.5 L/min 30 L/min 4.5 → 16 V dc 15 mm - 20bar Acetal Copolymer - - -40°C +70°C 10 mA
RS Stock No. 446-8286
Mfr. Part No.173936-C-RS
£65.49
Each
Liquid Turbine 0.5 L/min 5 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 198-3007
Mfr. Part No.FR2A15BVBN
£66.71
Each
Gas Variable Area 1 L/min 10 L/min - 1/8 in 1/8 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 740-6433
Mfr. Part No.SM8000
£560.60
Each
Liquid Magnetic-Inductive 0.2 L/min 100 L/min 19 → 30 V dc - M12 16bar PBT, Stainless Steel -20 °C +80°C -10°C +60°C -
RS Stock No. 448-7467
Mfr. Part No.MR3A18BVBN
£60.39
Each
Gas Variable Area 10 L/min 100 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 395-7173
Mfr. Part No.090-0014
£110.40
Each
Liquid Piston 0 L/min 55 L/min 220 V 3/8 in 3/8 BSP 0.3bar Brass - - - +90°C -
RS Stock No. 198-2975
Mfr. Part No.FR2A12BVBN
£65.38
Each
Gas, Liquid Variable Area 0.04 L/min 0.5 L/min - 1/8 in 1/8 NPT Female 7bar Acrylic - +65°C - +65°C -
RS Stock No. 906-7780
Mfr. Part No.VFA-7
£29.12
Each
Air Variable Area 5 SCFH 50 SCFH - 1/8 in 1/8 NPT Female 6.9 (With Valve) bar, 10 (Without Valve) bar Acrylic Plastic - +38 (Without Valve) °C, +48 (With Valve) °C - - -
RS Stock No. 395-6849
Mfr. Part No.142541BSPP
£87.50
Each
Liquid RotorFlow Electronic 2 L/min 20 L/min - 1/4 in 1/4 BSP Female 13.8bar Brass - - -29°C +100°C -
RS Stock No. 395-6940
Mfr. Part No.166701-RS
£33.80
Each
Liquid Piston - 0.2 L/min 120 → 240 V ac/dc 1/4 in 1/4 BSP 10bar Noryl - +100°C - +100°C -
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