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Flow Sensors

Flow sensors, also called liquid meters, flow meters, flow gauges, flow indicators, and flow rate sensors, are flow measurement devices that measure the gas or liquid passing through them. Depending on the desired applications, these air or vapour sensing devices come as time-measuring units for a set period or totalizing flow meters with a continuous medium measurement. Furthermore, these devices are equipped with a transducer and a transmitter. The transmitter generates and outputs signals from the transducer, which senses the fluid passing through the primary device using mechanical and electrical subsystems. These systems are essential for measuring fluid changes and their calculations. 

Factors to Consider When Choosing the Right Flow Sensor:

It is important to consider some basic parameters when selecting an appropriate flow sensor for your application, such as:

  • Type of fluid to measure/monitor.
  • Operating conditions of media
  • Tolerable pressure loss
  • Display Type/Signal Output
  • Required flow measurement (mass, velocity, etc.)
  • Viscosity and other media properties (magnetic, corrosiveness, pressure, etc.)
  • Pipe/Conduit physical properties (materials, diameters, etc.)

Types and Functions of a Flow Sensor:

Flow sensors are classified into various types, and each type offers specific applications; no one size fits all flowmeters. It is crucial to select the technology based on its accuracy, durability, reliability, and cost. Some of their types include:

  • Magnetic-Inductive Sensors – These sensors are used to detect three categories of the process, including consumed quantity, medium temperature, and volumetric flow quantity. 
  • Paddlewheel Flow Turbines/Sensors – These compact sensors are the most used types with high performance and large-capacity liquid speed measurement. The sensors connect to a pipe with a paddle wheel that calculates the speed by turning the paddle.
  • Variable Area Flow Sensors/ Rota Flow Meters – These flowmeters are known for their float designs and tapered tubes and are ideal for gas and liquid flow measurement. They offer minimal cost, a linear output, a low-pressure drop, and simple designs. Other popular types include:
  • Differential pressure flow sensor
  • Orifice flow meters
  • Pitot tube flow meter
  • Ultrasonic flow meters
  • Thermal mass flow sensors
  • Velocity flow sensors.

Applications for Flow Sensors:

Flow sensors are widely employed in commercial HVAC systems and industrial applications and systems, including: 

  • Cooling Systems
  • Chemical Factories
  • Medical Equipment
  • Irrigation
  • Septic Systems
  • Water Treatment
  • Industrial Washing Systems.

 


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Sensirion
Rohs Verified
SFM3019, Sensirion
16 In Stock
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1 +
£ 166.69
5 +
£ 148.19
10 +
£ 133.35
Key Instruments
1250AD6053ALAVB, Key Instruments
21 In Stock
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1 +
£ 309.93
Rohs Verified
14272389, WIKA
91 In Stock
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£ 540.74
Rohs Verified
7ME6310-5DB11-1AA1, Siemens
83 In Stock
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1 +
£ 5643.73
Rohs Verified
7ME6520-5KB13-2AA1, Siemens
85 In Stock
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1 +
£ 5872.50
Rohs Verified
PF3W704-F03-ETN-M, SMC
19 In Stock
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1 +
£ 763.49
Gems Sensors
155480BSPP, Gems Sensors
43 In Stock
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1 +
£ 75.22
FM.26 322 229, Parker
1 In Stock
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1 +
£ 775.48
Gems Sensors
166703, Gems Sensors
83 In Stock
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£ 45.65
EF.7731111291, Parker
2 In Stock
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£ 232.66
Rohs Verified
IFW510-F03-00-Q, SMC
1 In Stock
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£ 157.37
Rohs Verified
PF3W740S-F06-BTN-M, SMC
12 In Stock
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1 +
£ 866.42
Gems Sensors
Rohs Verified
51582, Gems Sensors
7 In Stock
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£ 350.78
Gems Sensors
Rohs Verified
155480, Gems Sensors
20 In Stock
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£ 62.60
Gems Sensors
Rohs Verified
29609, Gems Sensors
5 In Stock
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1 +
£ 236.00
Gems Sensors
155420BSPP, Gems Sensors
86 In Stock
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1 +
£ 75.22
Key Instruments
2540A5L61PI, Key Instruments
10 In Stock
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£ 313.89
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PF3W704S-F03-BN-M, SMC
87 In Stock
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£ 721.98
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PFM750S-C6-F, SMC
1 In Stock
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£ 234.35
Key Instruments
MR3A17BVBN, Key Instruments
17 In Stock
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£ 88.12
Gems Sensors
Rohs Verified
155421, Gems Sensors
4 In Stock
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£ 111.00
Gems Sensors
142542BSPP, Gems Sensors
82 In Stock
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1 +
£ 156.97
Sensata/Cynergy 3
Rohs Verified
FSU12A, Sensata/Cynergy 3
10 In Stock
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£ 24.67
Sensata/Cynergy 3
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FSU12LF, Sensata/Cynergy 3
8 In Stock
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£ 26.41
Sensata/Cynergy 3
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LFS-03, Sensata/Cynergy 3
6 In Stock
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£ 286.18
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New Items
New items
FSP10A30, Cynergy3

FSP10A30, Cynergy3

FSP10 Flow Switch The FSP10 Flow Switch is an electric pump that can provide increased flow within gravity fed water systems. The FSP10 flow switch should be placed in a pipe above the pump and will automatically start at a specified flow rate. The pump turns off automatically if the flow reduces or if the tank empties. 1" BSP pipe connections Automatic stop Max flow rate of 80l/min Note Each model number has a 'on flow rate' please check the datasheet to make sure the part meets your requirements.
New items
SFM3019, Sensirion

SFM3019, Sensirion

The Sensirion solution on providing high volumes of flow meters for medical ventilators in order to support the global pandemic situation due to the Corona virus outbreak. It relies on a modular approach of assembling approved parts with good availability to Sensirion and a high-volume through-put manufacturing. High reliability and long-term stability Industry-proven technology with a track record of more than 15 years Designed for mass production
New items
1250AD6053ALAVB, Key Instruments

1250AD6053ALAVB, Key Instruments

Key Instruments Flow Meter The Key Instruments GR series variable area flow meter measures the gas flow rate of 0.5L/min to 5L/min. It is made from borosilicate glass, it is ideal for use with liquids or gases. The user can configure it with a standard or precision control valve on the inlet, the outlet, or no valve at all. Features and Benefits Pipe diameter range is 1/8in Connection type 1/8 NPT female Maximum operating pressure is 13.7bar Maximum operating temperature is 93°C Water ranges from 21CCM to 2080CCM Air ranges from 50CCM to 66370CCM Rotating lens allows 180° view with magnification
New items
155480BSPP, Gems Sensors

155480BSPP, Gems Sensors

RFI Type Visual Flow Indicator RotorFlow® in its most basic form — a bright orange rotor turning with fluid flow. Simple, direct and reliable. Flow rate is estimated, or confirmed, by viewing the speed of the turning rotor. Either port can be used for incoming flow, and bayonet mounting lens is easily removed for quick cleanout. RFI Type RotorFlow® sensors are easy to see, easy to install and easy to afford. Features and Benefits • Bright visual flow confirmation • Flow ranges from 0.38 LPM to 227 LPM • Removable lens for quick cleanout • Available in brass, stainless steel or high performance plastic housings Product Application Information • Visual flow confirmation on heat exchangers • Plastic injection moulding equipment Dimensions Visual only - Polypropylene H64mm W35mm L123mm (Brass L77mm) Electronic versions - Polypropylene H64mm W61mm L125mm (Brass L77mm)
New items
FM.26 322 229, Parker

FM.26 322 229, Parker

Industrial Flow Indicators - Flowline High pressure, variable flow indicators with a graduated flow scale on the outer viewing sleeve and an indicator ring which is magnetically coupled to an internal piston. All utilise the technique of differential pressure across a piston which, as the flow increases, moves the piston against a calibrated spring. Can be installed on any plane. Maximum operating temperature 90°C Calibration Water SG 1.0 at 20°C Scale Reading 10% FS (min) Accuracy ±5% Repeatability ±1% Body Brass to BS2874 Wetted parts Magnet Alcomax, PTFE coated Non-wetted Parts Seal Viton Retainer Gland Brass to BS2874 CZ 121 M plated with electroless nickel Indicator Ring Mild steel plated with electroless nickel
New items
166703, Gems Sensors

166703, Gems Sensors

FS-3 Series Flow Switch 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. Features and Benefits • 0.2 l/min - 3.8 l/min with pre-adjusted set points • Operating pressure: 10 bar at 20°C • Inlet/Outlet ports: 1/4" NPT, R 1/4" • Any mounting position Product Application Information • Electronic Equipment: Laser Heads, Welders, Power Supplies, High-Speed Spindles, X-Ray Tubes, Semiconductor Equipment • Bearings or Gears: Presses, Rotating Equipment, Conveyors, Machine Tools, Robotics • Processing and Dispensing Equipment: Water Purifications and Filtering, X-Ray Film Processing, Beverage Dispensing, Chemical Additives, Gas Sampling, Distilling Note 50 micron filtration is recommended
New items
EF.7731111291, Parker

EF.7731111291, Parker

Flow Indicator The EASIFLOW is a flow measuring device incorporating an AC-DC switch suitable for controlling valves or pump motors or for activating alarm signals. Features and Benefits • Oil and water calibrated • Pressures up to 10 bar • Flows from 1 L/min to 150 L/min • Accuracy ±5% FSD • Repeatability ±1% FSD • fully adjustable flow rate signalling • Plant and equipment protection Technical Specification Operating temperature range +5°C to +60°C Maximum working pressure 10 bar Viscosity 10 to 200 centistrokes Accuracy ±5% Repeatablilty ±1% Connections 1" BSP female thread Construction Materials Body Polyester Viewing glass Borosilicate Seals Nitrile Rubber Cone Acetal Spring Stainless Steel Supplied with 2 x DIN standard sockets complete with plugs
New items
IFW510-F03-00-Q, SMC

IFW510-F03-00-Q, SMC

Detects and confirms flow Low flow setting possible (1l/min) Simple flow setting Available with Rc(PT), NPT or G(PF) threads Port sizes: 3/8, 1/2,
New items
155480, Gems Sensors

155480, Gems Sensors

RFI Type Visual Flow Indicator RotorFlow® in its most basic form — a bright orange rotor turning with fluid flow. Simple, direct and reliable. Flow rate is estimated, or confirmed, by viewing the speed of the turning rotor. Either port can be used for incoming flow, and bayonet mounting lens is easily removed for quick cleanout. RFI Type RotorFlow® sensors are easy to see, easy to install and easy to afford. Features and Benefits • Bright visual flow confirmation • Flow ranges from 0.38 LPM to 227 LPM • Removable lens for quick cleanout • Available in brass, stainless steel or high performance plastic housings Product Application Information • Visual flow confirmation on heat exchangers • Plastic injection moulding equipment Dimensions Visual only - Polypropylene H64mm W35mm L123mm (Brass L77mm) Electronic versions - Polypropylene H64mm W61mm L125mm (Brass L77mm)
New items
29609, Gems Sensors

29609, Gems Sensors

FS-550 Series Professional range of FS-550 series flow switches from Gems Sensors. This series of flow switches sense liquid flow in either direction to monitor flow/no-flow conditions. They are supplied in two paddle lengths. As flow increases in a pipe, the paddle of the switch pivots to move out of the liquid path. Therefore producing less than 3 PSIG of pressure drop regardless of pipe size. Altech Flow Sensors & Switches
New items
155420BSPP, Gems Sensors

155420BSPP, Gems Sensors

’Rotorflow’ Visual Flow Sensor/Indicator Polysulfone lens, ’Buna N’ ’O’-ring material and ceramic rotor pin Maximum viscosity 45cSt Max operating pressure Polypropylene 7 bar, brass 14 bar Operating temperature +80°C maximum Easy dismantling for maintenance and cleaning Supplied with low flow adaptors Dimensions Visual only - Polypropylene H64mm W35mm L123mm (Brass L77mm) Electronic versions - Polypropylene H64mm W61mm L125mm (Brass L77mm)
New items
2540A5L61PI, Key Instruments

2540A5L61PI, Key Instruments

High Flow FR5000 Series Indicator Series FR5000 is a standard precision-machined acrylic flow meter for liquids and gases, with direct reading air or water scales. Model FR5000 flowmeters have standard 1"" FNPT PVC fittings. Features and Benefits • Durable, 1 piece, clear acrylic construction • Large scales are easy-to-read • Valve with positive stop stays in place under pressure • Rod guided float for stable measurements • Fitting, valve and O-Ring options accommodate multiple applications • Multiple connection options for easier installation • Easy disassembly and assembly for maintenance Product Application Information • Air sampling equipment aquaculture • Desalinisation equipment • Gas analysers • Medical systems • Photo processing equipment • Water treatment and distribution systems • Purge
FAQs
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UK orders normally take between 2/3 working days. International orders normally take between 3/5 working days for all products including Flow Sensors.
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