Flow Sensors & Indicators

Flow sensors and flow indicators are flowmeter devices used to measure the amount of liquid, gas or vapour that passes through them. They can also be known as flow gauges or liquid meters. Flow sensors 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 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 Sensors and Indicators


Paddlewheel Flow Sensors or Turbine: One of the most common types of flow sensor. The sensors are connected to a pipe with liquid passing through and turning a paddle wheel, the primary device calculates the speed as the paddle is turned. This simple structure is compact and can perform large-capacity measurement. Disadvantages are clogging and maintenance is required to cope with the axial wear otherwise the paddle needs replacing.


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


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. Can include the following applications:


  • Water treatment

  • Cooling systems

  • Industrial Washing Systems

  • Irrigation

Things to consider:


  • What is the fluid being measured, if not water what is its viscosity?

  • Rate measurement or totalisation?

  • Display or signal output?

  • What is the minimum and maximum flowrate, process pressure and process temperature?

  • Size of the pipe

...
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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. 185-9998
Mfr. Part No.S.800003
BrandParker
MYR581.26
Each
units
Liquid Variable Area 0.07 L/min 0.55 L/min - 1/4 in 1/4 BSP 10bar - - - - +60°C -
RS Stock No. 407-596
Mfr. Part No.AWM3300V
BrandHoneywell
MYR529.49
Each
units
Dry Gas Amplified -1000 sccm 1000 cm³/min 15 V dc 0.2 in - 25psi Plastic - - -25°C +85°C -
RS Stock No. 901-0233
Mfr. Part No.198803329
MYR1,378.48
Each
units
Liquid Variable Area 100 l/h 1000 L/h - Maximum of 32 mm DN25 Socket - Plastic - - - - -
RS Stock No. 198-2903
Mfr. Part No.MR3A13BVBN
MYR450.51
Each
units
Gas Variable Area 0.1 L/min 1.2 L/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 740-6430
Mfr. Part No.SU8000
MYR4,045.00
Each
units
Liquid Ultrasonic 0 L/min 100 L/min 19 → 30 V dc - 1 BSP 16bar Aluminium Alloy -10 °C +80°C -10°C +60°C -
RS Stock No. 849-9439
Mfr. Part No.PFMV505-1
BrandSMC
MYR870.89
Each
units
Dry Air, Gas Suction 0 L/min 0.5 L/min 12 → 24 V dc 4 mm One-Touch Fitting 500kPa PPS 0 °C +50°C 0°C +50°C -
RS Stock No. 456-3066
Mfr. Part No.SF5200
MYR934.00
Each
units
Gas, Liquid Modular Flow Monitoring 3 (Liquids) ccm/s, 200 (Gases) ccm/s 300 (Liquids) cm³/s, 3000 (Gases) cm³/s - - M18 x 1.5 300bar Stainless Steel -25 (Gases) °C, -25 (Liquids) °C +80°C - - -
RS Stock No. 123-7149
Mfr. Part No.SFM3000-200C
BrandSensirion
MYR409.00
Each
units
Gas Low Pressure Drop -200 slm 200 slm 5 V 22 mm 2-Wire I2C 1.3bar Epoxy, Gold, Polyurethane, PPE+PS Blend, Si, Si3n4, Siox, Stainless Steel (Annealed) -20 °C +80°C -20°C +80°C -
RS Stock No. 804-3907
Mfr. Part No.7MF4433-1DA22-2RB1
BrandSiemens
MYR11,699.71
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 0.25bar Aluminium -40 °C +85°C -40°C +85°C -
RS Stock No. 173-2224
Mfr. Part No.LG01-2000A005
BrandSensirion
MYR584.05
Each (In a Tray of 25)
units
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 220 (Water) ml/min, 250 (Isopropyl Alcohol) ml/min 5 → 12 V 9.2 mm 5 Pin PCB Header 3bar Borosilicate Glass (Tube Material), FEP (Sealing), PEEk (Fitting) - - +10°C +50°C 6.8 mA
RS Stock No. 901-0239
Mfr. Part No.198807008
MYR1,036.43
Each
units
Liquid Variable Area 500 l/h 500 L/h - - DN25 Socket - Plastic - - - - -
RS Stock No. 898-6738
Mfr. Part No.LG01-2000A005
BrandSensirion
MYR667.49
Each
units
Liquid Liquid Flow Switch 250 (Isopropyl Alcohol) 220 (Water) ml/min, 250 (Isopropyl Alcohol) ml/min 5 → 12 V 9.2 mm 5 Pin PCB Header 3bar Borosilicate Glass (Tube Material), FEP (Sealing), PEEk (Fitting) - - +10°C +50°C 6.8 mA
RS Stock No. 361-0262
Mfr. Part No.FR5A54PI
MYR1,613.68
Each
units
Gas Variable Area 100 L/min 1400 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 446-8286
Mfr. Part No.173936-C
MYR472.50
Each
units
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. 361-0161
Mfr. Part No.FR4L72BVBN
MYR1,125.01
Each
units
Gas Variable Area 14 L/min 140 L/min - 1/4 in 1/4 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 510-0616
BrandRS PRO
MYR1,371.33
Each
units
Gas, Liquid Piston Inline 0.5 L/min 3 L/min - 8 mm 1/4 BSP Female 16bar Aluminium - +100°C - +120°C -
RS Stock No. 313-5553
Mfr. Part No.426506
BrandBurkert
MYR9,050.60
Each
units
- - - - 18 → 36 V dc DN 6 → 400 mm - - - - - -10°C +60°C -
RS Stock No. 907-4044
Mfr. Part No.180395
MYR1,576.06
Each
units
Liquid RotorFlow Electronic 5 gal/min 300 gal/min 24 V dc 3/4 in 3/4 NPT Female 13.8bar Brass - +21°C -29°C +100°C 20 mA @ 24 V dc (No Load), 35 mA @ 24 V dc (Load)
New
RS Stock No. 201-7954
Mfr. Part No.HAFBLF0200CAAX5
BrandHoneywell
MYR370.71
Each
units
Air, Gas Analog 1 l/min 10 L/min 5 V dc - - - - - - - - -
RS Stock No. 181-0600
Mfr. Part No.E8PC-YA-C18
BrandOmron
MYR471.45
Each
units
- Adapter - - - - NPT 1/8 Male - SUS304 - - -20°C +80°C -