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Flow Sensors

Flow sensors are flow measurement devices designed to measure the gas or liquid movement passing through a pipe, conduit, or other channels. These devices act as fluid detectives and are equipped with a transducer and a transmitter. The integrated transmitter generates, and outputs signals from the transducer, which senses the fluid passing through the primary device using mechanical and electrical subsystems. The outputs are then processed to provide real-time accurate data necessary for monitoring, controlling, and optimising various processes in multiple applications. 

Alternative Names for Flow Sensors

Flow sensors can be alternatively known as liquid meters, flow transducers, flow meters, flow gauges, flow indicators, and flow rate sensors.

Why Buy Flow Sensors? Uncovering Their Potential Advantages

Flow sensors are crucial fluid rate sensing devices offering numerous benefits. With these devices, you can control, monitor, and optimise various processes with robust accuracy and efficiency. Liquid flow meter sensors help detect potential issues, maintain balance, prevent costly downtime, and facilitate informed decision-making for improved productivity and resource management.

Selection Criteria for Choosing Appropriate Flow Sensor

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

  • Flow Rate Range
  • Media Operating Conditions
  • Display Type/Signal Output
  • Accuracy & Precision
  • Fluid Compatibility
  • Physical Size and Mounting
  • Durability and Reliability
  • Materials
  • Output Signal
  • Installation and Maintenance
  • Cost and Brand.

Popular Types and Functions of Flow Sensors

Flow sensors are classified into various types, each designed for specific applications; no one size fits all flowmeters. Some of the popular flow sensor types include:

  • Magnetic-Inductive Sensors – These sensors can detect three categories of the process: 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

  • Thermal Flow Sensors
  • Differential Pressure Flow Sensor
  • Orifice Flow Meters
  • Turbine Flow Sensors
  • Pitot Tube Flow Meter
  • Ultrasonic Flow Meters
  • Velocity Flow Sensors.

Typical Applications of Flow Sensors

Flow sensors are widely employed in various equipment, industrial applications, and systems, including: 

  • Chemical Factories
  • Industrial Process Control
  • Medical Equipment
  • Automotive Industry
  • Pharmaceutical Industry
  • Irrigation
  • Oil & Gas Industry
  • Food & Beverage Industry
  • HVAC Systems
  • Septic Systems
  • Water Treatment
  • Industrial Washing Systems.

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Enrgtech #
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Name
Availability
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Burkert
Rohs Verified
426506, Burkert
1 In Stock
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1 +
£ 1502.88
Gems Sensors
155480BSPP, Gems Sensors
Pre Order
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1 +
£ 78.91
Novotech Controls
RS_256-562, Novotech Controls
23 In Stock
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£ 49.76
RS Pro
257-149, RS Pro
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1 +
£ 53.58
Gems Sensors
Rohs Verified
155421, Gems Sensors
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1 +
£ 123.85
Gems Sensors
166703, Gems Sensors
28 In Stock
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£ 47.88
FM.26 322 229, Parker
Pre Order
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£ 632.25
Key Instruments
MR3A17BVBN, Key Instruments
110 In Stock
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1 +
£ 90.35
Rohs Verified
IFW510-F03-00-Q, SMC
1 In Stock
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£ 146.35
Rohs Verified
PF3W740S-F06-BTN-M, SMC
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£ 596.87
Gems Sensors
142542BSPP, Gems Sensors
29 In Stock
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1 +
£ 139.68
Gems Sensors
155420BSPP, Gems Sensors
39 In Stock
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1 +
£ 78.91
Gems Sensors
Rohs Verified
155480, Gems Sensors
41 In Stock
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1 +
£ 69.82
Gems Sensors
Rohs Verified
29609, Gems Sensors
2 In Stock
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1 +
£ 266.17
Key Instruments
2540A5L61PI, Key Instruments
2 In Stock
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1 +
£ 321.79
Sensirion
Rohs Verified
SFM3019, Sensirion
1 In Stock
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£ 100.65
5 +
£ 97.93
10 +
£ 95.35
RS PRO
257-6413, RS PRO
1 In Stock
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£ 60.70
Rohs Verified
PFMB7102-F04-B, SMC
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£ 249.50
Rohs Verified
PF2A750-F02-67, SMC
1 In Stock
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£ 466.32
Rohs Verified
PF3W720S-F04-FT-M, SMC
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£ 586.18
Endress+Hauser
Rohs Verified
6BABL1-AADBCAASAGA1K, Endress+Hauser
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£ 1651.93
Rohs Verified
7D2C25-AAACCAAAAAD2SKA1, Endress+Hauser
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£ 1924.83
ifm electronic
Rohs Verified
SF321A, ifm electronic
10 In Stock
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£ 263.95
ifm electronic
Rohs Verified
SV5200, ifm electronic
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£ 337.78
Rohs Verified
SFAB-200U-WQ8-PNLK-PNVBA-M12, Festo
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£ 340.03
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New Items
New items
RS_511-3909, RS PRO

RS_511-3909, RS PRO

Turbine Flow Meter: Hall-Effect Detection This multi-range radial flow, hall-effect turbine flow meter uses a low inertia turbine supported on robust sapphire bearings, in a chemically resistant housing. This Turbine flow meter uses Hall Effect sensing so that opaque fluids may still be metered. For OEM applications the fittings can be tailored to suit the installation and speed up production. At the heart of the hall effect turbine flow meter is a precision turbine that rotates freely on robust sapphire bearings. This rotation is detected by a Hall Effect detector. The resulting output is a NPN pulse that is readily interfaced with most electronic display or recording devices. This combination of materials and technology ensures a long life product with reliable operation throughout. Features and Benefits Economical PPS body ± 0.75% reading (when used with metra-smart) 1-2% FSD Sapphire bearings Hall-effect sensing 15 Bar rating IP65 Viton seal as standard 0.1% Repeatability 5 to 24 V dc -15°C to 125°C Product Application Information Opaque fluids Laboratory tests Cooling equipment Semiconductor plant Water treatment Low viscosity fluids
New items
FSU12LF, Sensata/Cynergy 3

FSU12LF, Sensata/Cynergy 3

The Cynergy3 FSU series flow switches are designed for use in liquid flow systems at pressures up to 10 bar and temperatures up to 85ºC. The design is based around a moving magnet and a fixed reed switch with a low flow restriction. The switches are designed to be used in liquids only and should not be used in systems with significant amounts of solid particles. 1/2” and 3/4” NPT thread connections 1/2” and 3/4” push fit connections Low flow versions available Maximum operating pressure 10 bar NSF 61 Approved Operating temperature rated to 185°F
New items
RS_613-4216, RS PRO

RS_613-4216, RS PRO

RS PRO Flow Switch The RS PRO paddle flow switch has a flow rate of 4L/min to 5.5L/min. This instrument operates by a spring-supported paddle with the magnetic triggering of a micro switch. It monitors liquid flow using a paddle. It has a spring-supported stainless steel paddle located in the flow chamber moved by a medium in the direction of flow. When a preset flow rate is approached, the magnet connected to the paddle attracts the magnet with opposite poles outside the flow chamber linked to a microswitch. This generates a limit value when the actual flow rate is above or below a nominal value preset. Note: Mainly used on water. However, if used with oil, the readings may differ due to the viscosity of the liquid. Features and Benefits Pipe diameter range is 10mm Connection type is 3/8 BSP female Good repeatability Low pressure loss Dirt-resistant Hermetic separation of electrical and hydraulic components High switch capability Tolerance ±15% of full scale Average pressure loss 0.01bar at Qmax Applications It is use for indication that something is not working and can be found in cooling circuits HVAC Laser circuits Thermal exchange (water chillers)
New items
LFS-03, Sensata/Cynergy 3

LFS-03, Sensata/Cynergy 3

Sensata Cynergy3 Paddle Flow Switch, 230V, 20 Bar - LFS Series - LFS-03 Features & Benefits What pressure range can this switch handle? Where on the pipe should I install this paddle switch?
New items
FR4L72BVBN, Key Instruments

FR4L72BVBN, Key Instruments

FR4500 Series Flow meters The FR4500 series is a standard precision-machined acrylic flow meter for liquids or gases and has direct reading air and water scales. The FR4500 flow meters can be configured with a control valve on the inlet or no valve at all, O-Rings are provided as Buna-N. Features and Benefits • Easy-to-read scales • Water ranges from 1 LPM to 20 LPM • Air ranges from 14 LPM to 560 LPM • Threaded brass inserts for quick installation • Easy disassembly and assembly for maintenance • Durable 1 piece clear acrylic construction • Stable, easy-to-read float • Superior quality Product Application Information Compatible with most gases and fluids. Note Mounting screws are required (available separately).
New items
DTT31-A1C111AE2CAB, Endress+Hauser

DTT31-A1C111AE2CAB, Endress+Hauser

The Endress+Hauser flow switch is designed for the safe measurement, display and monitoring of relative mass flow rates of liquid media with practically no pressure loss. It can be selected between one or two switch outputs as well as one switch output and one standardized analogue output for flow rates or temperature values. Leak monitoring in process lines Monitoring pump functionality Monitoring lubrication systems Filter monitoring in the beverage industry
New items
FSU12A, Sensata/Cynergy 3

FSU12A, Sensata/Cynergy 3

The Cynergy3 FSU series flow switches are designed for use in liquid flow systems at pressures up to 10 bar and temperatures up to 85ºC. The design is based around a moving magnet and a fixed reed switch with a low flow restriction. The switches are designed to be used in liquids only and should not be used in systems with significant amounts of solid particles. 1/2” and 3/4” NPT thread connections 1/2” and 3/4” push fit connections Low flow versions available Maximum operating pressure 10 bar NSF 61 Approved Operating temperature rated to 185°F
New items
511-3915, RS Pro

511-3915, RS Pro

Polysulfone Flowmeters Polysulphone bodied flowmeters Open collector (NPN) pulse output proportional to flow rate Non-metallic fittings, PVDF, available for pure water or aggressive chemicals Robust sapphire bearings ” BSP threads on the 30 l/min model also accepts 15mm Compression fittings (brass only) Traceable calibration certificate Hall effect detection suitable for used with opaque liquids Model 1//2 3//4 Flow 2.5 to 30 l/min 6.0 to 100 l/min Working pressure 15 Bar max. 15 Bar max. Temperature range -25 to +125°C -25 to +125°C Note RS Stock 5113937 is the fixing Kit for the Flow Controller which is RS Stock 5113909 Supplied with 8888
New items
508-2704, RS Pro

508-2704, RS Pro

Mini Turbine Flow Meter The mini turbine flowmeter is designed to give high performance and competitive pricing. Its totally non-metallic wetted components makes this the ideal choice for the metering of aggressive chemicals including ultra-pure water. The standard inlet tubes are barbed to accept 8mm hose sizes. The bearings are made of sapphire for long life and reliability, the body is moulded PVDF as standard and the 'O' ring seal is typically Viton®. Features and Benefits Low cost Sapphire bearings Hall effect sensor 0.1% repeatability -25°C min to 125°C max Product Application Information Drink dispensing Laboratory tests Cooling equipment Active flow alarms Semiconductor plant Jet size 1 mm 2mm 3mm 4mm No jet Flow (l/min) 0.05 – 0.5 0.05 – 1.5 0.15 – 4.5 0.18 – 6.5 0.2 - 10 Supply voltage 4.5 to 24Vdc 4.5 to 24Vdc 4.5 to 24Vdc 4.5 to 24Vdc 4.5 to 24Vdc Note When used in automotive applications, the formation of vapour should be minimised by fitting the transducer between the fuel pump and the carburettor, but before any pressure regulator. The device should be mounted vertically if vapour is likely to form. Supplied with two metres of oil resistant, screened cable.
New items
198840143, Georg Fischer

198840143, Georg Fischer

Paddlewheel Flow Sensor Georg Fischer Signet 2536 rotor-x paddle wheel flow sensors can measure fluid flow in pipelines and low-pressure systems from 0.5 m/s to 6 m/s. The rotor-x paddle wheel can be installed into a wide range of pipe sizes from DN15 to DN 900 by using Signet plastic fittings. Its simple, low maintenance construction is chemically compatible with a broad range of liquids (see the datasheet). Features & Benefits Easy to replace rotor Installs into pipe sizes DN15 to DN900 ( to 36 in.) Operating range 0.1 to 6 m/s (0.3 to 20 ft/s) Wide Turndown Ratio of 66:1 High resolution and noise immunity Open-collector output Chemically resistant materials Applications Rotor-x paddle wheel sensors are suitable for a wide range of aplictaions including Chemical Production Liquid Delivery Systems Pump Protection Filtration systems Pure Water Production Not suitable for gases Scrubber Systems Water Monitoring Standards CE, China RoHS, RoHS, FCC, NSF (3-2536-PX version only)
New items
MC804-20001403, Digitron

MC804-20001403, Digitron

The Digitron ultrasonic clamp-on thermal, heat/energy meter that uses ultrasound to measure flow rate and PT100 temperature sensors to measure flow and return temperatures. The U1000MKII-HM displays energy rate and totalised energy with pulse output and communication options, so it can be used as a standalone meter or as an integral part of an aM&T or BEM’s system. IP54 electronics enclosure Pulse for volume flow and energy in kWh Heat/energy metering in energy management or building services applications for LTHW or chilled water circuits
New items
EF.7731112291, Parker UCC

EF.7731112291, Parker UCC

Flow Switch Calibrated flow indicator with switched output specifically designed for use with water. Suitable for installation in any plane. Utilises the technique of differential pressure across a piston against a calibrated spring, with the flow rate read off a scale marked on the viewing window. The switch incorporates an AC magnetically operated reed switch output (minimum current of 50mA) which can be adjusted across the flow range to enable remote indication of max/min, and flow rate exceeded 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 Note The switch is non-latching, once the flow rate has passed the switching level, it will de-activate. If latching is required, a separate circuit containing a latching relay is necessary. All units are supplied with instruction leaflets. Supplied with 2 x DIN standard sockets complete with plugs
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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