Flow Meters for Accurate Liquid Metering

• Durable and safe: Available in SS, PP, PPS, or ETFE materials, with a choice of o-rings. Additionally, there are no metal components in the measuring chamber. 
• Viscosity range: <1 to max. 2,500 mPas.
• High accuracy: +/- 1% filling precision.
• Versatile use: Compatible with manual and automatic dispense systems, also suitable for non-lubricating media eg. de-ionised water. FMJ suitable for manual dispensing only. 
• No mains power needed: Inductive counter operates independently using freely available batteries. 
• Compact & easy to install: Simple assembly on pumps or in piping, with a range of adaptors available. 
• Fluxtronic batch controller: FMC models supplied in various configurations, with close-coupled or remote wall-mounted programmable, battery-powered Fluxtronic display with Ex-certification.  

The ideal solution for use with Flux drum pumps, FMC 100 handles flow rates from 10–100 l/min at max pressure 6 bar*. Furthermore, models are available for acids, alkalis, fuels, solvents and flammable media. Paired with the Fluxtronic® batch controller, FMC 100 delivers precise manually controlled dispensing, or one-touch semi-automatic batch dispensing. Additionally, it can be integrated with PLC, or other control systems.  

Optimised for fixed installation in stationary piping, the FMC 250 is suitable for flow rates from 25–250 l/min at max pressure 6 bar*. Constructed from polypropylene and PPS, or PVDF and PE materials, FMC 250 is built to withstand either dilute chemicals, or concentrated acids and alkalis. Furthermore, it can be supplied with Fluxtronic® display, for precise dosing and seamless integration into automated processes.  

With 10–100 l/min capacity at max pressure 4 bar, the FMJ 100 is a lightweight, durable option for manual filling only. Paired with the Fluxtronic® display, it displays real-time fill quantities for accurate, controlled liquid dispensing. This model is available only in PP / PPS materials with FKM o-rings. 

• Versatile measurement: Models available for water-like fluids (< 1 mPas) up to highly viscous media (< 500,000 mPas). 
• Configurable options: Available with close-coupled Fluxtronic® evaluation unit for real-time monitoring, or impulse output version for use with remote, wall mounted Fluxtronic® (or other external control systems). 
• High accuracy & repeatability: Delivers precise filling and dosing with accuracy as high as ±0.5%. 
• Seamless integration: Outputs signals for PLC systems, switching amplifiers and automated batch dispensing processes. 
• Robust & flexible: Handles high pressure (up to 200 bar), works with pulsating flows, has low pressure loss and can display measurements in litres, gallons or kilograms. 
• Industrial & hazardous area use: Ex-approved models available for Zone 1 / 2 areas. Furthermore, FDA-compliant versions are available for food and pharmaceutical applications. 

• FMO 101 (0.04–1.67 l/min)) – Compact and precise metering for low flow applications, handling acids, alkalis, fuels and solvents. Also available in stainless steel for Ex Zone 1 use. 
• FMO 102 (0.25–8.3 l/min) – A versatile solution for industrial dosing with high-precision measurement across different fluids. Its durable polyvinylidene fluoride or stainless steel housing allows safe handling of acids, alkalis, fuels, highly flammable media, petroleum products and solvents. 
• FMO 104 (1–30 l/min) – Available with aluminium or stainless steel housing, designed for demanding low to high-viscosity media. Featuring ±0.5% accuracy and a high degree of repeatability. Ex-approved models available for flammable liquids. 
• FMO 110 (5.7–170 l/min) – Suitable for high-flow industrial processes in conjunction with our F 400 and F 500 series pumps. Available in stainless steel, PVDF and aluminium materials. FDA CFR 21 compliant versions for sanitary applications. ATEX versions also available. 
• FMO 140 (9.5–245 l/min) – High-capacity flowmeter with flanged connections for fixed pipeline installation. ±0.5% precision, therefore ideal for high volume chemical processing and bulk liquid transfer. Also available in stainless steel and aluminium materials. 
• FMO 150 (15–380 l/min) – Heavy-duty, high capacity meter for fixed pipeline installation. Aluminium and stainless steel models for large-scale projects. Suitable for use in Zoned areas where ATEX compliance is required.  

Each model integrates seamlessly with the Fluxtronic® display, thereby providing real-time monitoring, batch control and automation of pumps and valves for industrial liquid handling. Whether for manual dosing, semi-automatic filling, or fully automated processes, FMO flow meters provide accuracy and safe operation in every application. 

• Versatile flow measurement: Handles 5–120 l/min at an accuracy of ±1%. 
• User-friendly digital display: Features an illuminated, two-line LED screen for real-time dispense values and stored volume tracking. 
• Flexible installation: The display adjusts to different viewing angles and can be repositioned after assembly. 
• Multi-directional: Finally, symmetrical measuring chamber allows use in any flow direction. 

• Operating pressure: Up to 10 bar 
• Viscosity range: 0.8 – 40 mPas 
• Durable housing: Glass-fibre reinforced polypropylene 
• Compatible fluids: Diesel, heating oil, AdBlue®, radiator antifreeze, water and other non-flammable, non-corrosive media 

• Fast, secure filling for industrial and commercial applications.
• Easy calibration & operation for efficiency and reliability.
• Additionally, the compact, lightweight design allows for seamless integration with FLUX pumps.
• Cost-effective solution for simple metering tasks. 

With its robust construction and high performance, the FMT 120 is the perfect choice for businesses that require a reliable, high-precision flow meter for low-viscosity liquids. 

Selecting the right flow meter requires a detailed understanding of the fluid properties, system hydraulics and process requirements. Start by identifying the type of liquid being measured. For example, is the fluid flammable or non-flammable? Conductive or non-conductive? Low or high viscosity? Is it corrosive, pure, crystallising, or laden with particulates? These characteristics significantly influence flow meter compatibility. Furthermore, always check that the materials of construction are chemically compatible with the fluid. This helps prevent degradation or corrosion and ensures long-term reliability. 

For instance, nutating disc flow meters are ideal for neutral, acidic, or alkaline chemicals and fluids containing small solid particulates. On the other hand, turbine flow meters are better suited for clean, low-viscosity fluids, such as light oils or water. In contrast, positive displacement flow meters handle viscous fluids and food products, such as oils or syrups. However, they do not suit liquids containing solid particles unless you install a correctly-sized filter upstream. 

Next, consider the required flow range, liquid temperature and pressure conditions. The flow meter must operate accurately within these parameters without risk of damage or calibration drift. You must also consider the additional pressure loss resulting from the addition of a particular flow meter, in relation to the system pressure available. Furthermore, assess the installation environment. Will the meter be supported via the pump outlet, or by fixed pipework? Consider if the meter will be used in a hazardous or safe area.  Additionally, is integration with digital control systems, via on-board signal outputs required? 

At Flux Pumps UK, we can help customers select the most appropriate flow meter for their specific application - whether for manual dosing, automated filling, programmable batch dispensing, or continuous process monitoring.  

The placement of a flow meter is important for accurate measurement. As a general rule, install the flow meter after the pump, on the discharge side. This positioning ensures a reliable, stable flow and steady pressure, which improves accuracy and repeatability of the readings. Additionally, the extra delivery pressure provided by a pump is useful for overcoming pressure losses that result from installation of the flow meter. Note that pressure losses can be extremely high when metering highly viscous, adhesive media. 

Installing a flow meter on the suction side, before the pump, can expose it to pressure fluctuations, cavitation, or pulsation caused by the pump’s intake. These unstable flow conditions may result in erratic readings or even mechanical damage over time. 

To enhance accuracy, it’s best to install a straight length of pipe (typically 5 to 10 times the diameter of the pipe) before and after the flow meter. This eliminates turbulent flow caused by bends, valves, or fittings. However, this is not critical. When using drum or IBC pumps, it is normal to install the flowmeter directly on the pump outlet. This aids portability and handling during container changes. 

Whether integrating the meter into a portable drum or IBC pump system, or mounting within fixed pipework, our meters are optimised for optimal performance and reliability. 

Yes, you can install many types of flow meter in vertical piping, but with some caveats. The most important factor is flow direction. When installing a meter vertically, the fluid should generally flow upwards. This consequently helps ensure the meter remains filled with liquid and prevents the formation of air pockets that could interfere with measurement. 

Certain metering technologies, such as magnetic or ultrasonic flow meters, are less sensitive to orientation, provided the pipeline stays completely full during operation. However, turbine and mechanical flow meters may require specific orientations. This ensures that moving parts function without excessive friction or unwanted contact, resulting in damage. 

A good example is the oval gear flowmeter. This meter should not be installed in a horizontal orientation, with the gear axles positioned vertically. This is because the gears and meter housing are designed with extremely tight tolerances, to avoid liquid slip. Therefore, incorrect orientation can lead to contact between the gears and the meter housing, leading to scoring and premature wear. 

It is also essential to consider the location of valves, bends, restrictions and other turbulence-inducing components near the flow meter inlet. Vertical installations may be more prone to problems if the liquid feed does not provide enough backpressure, or if air entrainment occurs. 

At Flux Pumps UK, many of our flow meters, including the FMO oval geared flowmeter, support vertical or horizontal installation, depending on the pump type used and the process layout. We provide clear technical guidance on positioning and orientation, to ensure your meter performs optimally in every installation.