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

...
Read more Read less

Filters

Viewing 81 - 100 of 224 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. 907-3965
Mfr. Part No.155480
SGD122.92
Each
units
Fluid, Liquid RotorFlow 1.5 gal/min 20 gal/min - 1/2 in 1/2 NPT Female 6.9bar Polypropylene - +21°C -29°C +82°C -
RS Stock No. 804-3901
Mfr. Part No.7MF4433-1HA22-2RB1
BrandSiemens
SGD3,612.28
Each
units
Gas, Liquid, Vapour Digital Pressure Transmitter - - 9 → 24 V - 1/4 NPT 30bar Aluminium -40 °C +85°C -40°C +85°C -
RS Stock No. 446-8292
Mfr. Part No.173037-C
SGD144.68
Each
units
Liquid Turbine 1 L/min 10 L/min 5 → 24 V dc 3/8 in 3/8 BSP 200psi Nylon 12 - - -20°C +100°C -
RS Stock No. 901-0258
Mfr. Part No.198807005
SGD268.80
Each
units
Liquid Variable Area 20 l/h 200 L/h - - DN25 Socket - Plastic - - - - -
RS Stock No. 361-0161
Mfr. Part No.FR4L72BVBN
SGD337.98
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. 907-3953
Mfr. Part No.155421
SGD223.22
Each
units
Liquid RotorFlow Electronic 0.1 gal/min 5 gal/min 4.5 → 24 V dc 1/4 in 1/4 NPT Female 6.9bar Ploypropylene - +21°C -29°C +82°C 8 mA
RS Stock No. 906-7765
Mfr. Part No.VFA-3
SGD59.64
Each
units
Air Variable Area 0.6 SCFH 5 SCFH - 1/8 in 1/8 NPT Female 10 (Without Valve) bar, 6.9 (With Valve) bar Acrylic Plastic - +38 (Without Valve) °C, +48 (With Valve) °C - - -
RS Stock No. 623-7933
Mfr. Part No.AWM720P1
BrandHoneywell
SGD265.32
Each
units
Dry Gas Compensated/Amplified - 200 SLPM 15 V dc 22 mm 4-Pin 25psi Plastic - - -25°C +85°C -
RS Stock No. 906-9679
Mfr. Part No.RMA-1-SSV
SGD89.98
Each
units
Air Variable Area 0.05 SCFH 0.5 SCFH - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - - - +54°C -
RS Stock No. 286-260
Mfr. Part No.EF.7731111290
BrandParker
SGD326.86
Each
units
Liquid Variable Area 2 L/min 30 L/min - 1 in 1 BSP Female 10bar PET - - +5°C +60°C -
RS Stock No. 456-3066
Mfr. Part No.SF5200
SGD286.10
Each
units
Gas, Liquid Modular Flow Monitoring 200 (Gases) ccm/s, 3 (Liquids) 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. 361-0256
Mfr. Part No.FR5A53PI
SGD483.03
Each
units
Gas Variable Area 100 L/min 700 L/min - 1 in 1 NPT Female 6.89bar Acrylic - +65°C - +65°C -
RS Stock No. 804-3926
Mfr. Part No.7MF4997-1BE
BrandSiemens
SGD228.92
Each
units
- Cover with Window - - - - - - Die-Cast Aluminium - - - - -
RS Stock No. 906-7774
Mfr. Part No.VFA-3-SSV
SGD103.69
Each
units
Air Variable Area 0.6 SCFH 5 SCFH - 1/8 in 1/8 NPT Female 10 (Without Valve) bar, 6.9 (With Valve) bar Acrylic Plastic - +38 (Without Valve) °C, +48 (With Valve) °C - - -
RS Stock No. 901-0227
Mfr. Part No.198807011
SGD359.08
Each
units
Liquid Variable Area 5 l/h 50 L/h - - DN10 Socket - Plastic - - - - -
RS Stock No. 901-0069
Mfr. Part No.198840143
SGD927.51
Each
units
Liquid Paddlewheel 0.1 m/s 6 m/s 5 → 24 V dc 0.5 → 4.0 in DN15 to DN 100 Socket 12.5bar Polypropylene - - -18°C +85°C <1.5 mA @ 3.3 → 6 V dc, <20 mA @ 6 → 24 V dc
RS Stock No. 395-6928
Mfr. Part No.156265BSPP
SGD425.61
Each
units
Liquid RotorFlow Electronic 2 L/min 20 L/min 24 V dc - 1/4 BSP Female 14bar Brass -29 °C +100°C -29°C +100°C -
RS Stock No. 198-3035
Mfr. Part No.GR 0.5-5LPM AIR
SGD393.97
Each
units
Gas Variable Area 0.5 L/min 5 L/min - 1/8 in 1/8 NPT Female 13.7bar Borosilicate Glass - - - +93°C -
RS Stock No. 198-2953
Mfr. Part No.MR3L10BVBN
SGD135.34
Each
units
Liquid Variable Area 5 ccm 110 cm³/min - 1/8 in 1/8 NPT Female 6.9bar Polycarbonate - +65°C - +65°C -
RS Stock No. 198-0682
Mfr. Part No.FM.26 222 129
BrandParker UCC
SGD684.81
Each
units
Liquid Variable Area 2 L/min 20 L/min - 1/2 in 1/2 BSP - Brass - - - +90°C -