Vortex Flow Meter - lightweight flow for monitoring cleansing, cooling water or spa water
Our vortex flow meters the LIQUI-VIEW deliver accurate, maintenance‑free performance for liquids, making them ideal for monitoring (cool) water flow.
The LIQUI‑VIEW Base series operates on the Kármán vortex principle and has no moving parts, ensuring long‑life reliability and resistance to hard‑water deposits. With IP65 protection, flow ranges from 0.5 to 150 l/min up to 12 bar, and your choice of 4–20 mA (A‑model) or frequency output (P‑model), they integrate seamlessly into any industrial setup.
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What are liquid flow meters?
Liquid flow meters are used to measure, monitor and control the flow of liquids in industrial processes. Accurate flow measurement helps maintain stable process conditions, detect unexpected flow changes and improve the efficient use of water and other process liquids.
Mass Flow Online offers two complementary technologies for measuring liquid flow: the LIQUI-VIEW vortex flow meter for low-viscosity, water-like liquids and the MAG-VIEW magnetic flow meter for water and other electrically conductive liquids. Both product series have no moving parts and are designed for reliable flow monitoring in compact industrial systems.
Your benefits at a glance
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Definition and importance of liquid flow measurement
What is liquid flow?Liquid flow describes the volume of liquid that passes through a pipe or measuring point during a defined period. It is commonly expressed in units such as litres per minute (l/min) or cubic metres per hour (m³/h). A higher flow rate means that a larger volume of liquid passes through the system in the same period. | Typical output signalsDepending on the selected model, LIQUI-VIEW and MAG-VIEW flow meters can provide an analogue 4–20 mA signal or frequency output. These signals allow the flow meter to be connected to a PLC, display, data logger or process control system. |
Why is liquid flow measurement important?
Reliable flow measurement provides valuable information about the performance of a process. It can support:
Efficiency and cost control: Process consistency: | Equipment protection: Early fault detection: |
Which liquid flow meter do you need?
The correct flow meter depends on the liquid, its electrical conductivity, the required flow range and the conditions within the installation. Mass Flow Online offers two main measurement technologies for water and water-based liquids.
| Product series | Measurement technology | Suitable liquids | Typical applications |
|---|---|---|---|
| LIQUI-VIEW | Vortex flow measurement | Low-viscosity, water-like liquids | Cooling water, drinking water, deionised water, purified water and general water monitoring |
| MAG-VIEW | Magnetic-inductive flow measurement | Water and other electrically conductive liquids | Process water, aqueous solutions, dosing, batching and machine integration |
The conductivity of the liquid is an important selection criterion.
A MAG-VIEW requires an electrically conductive liquid. For low-viscosity, water-like liquids where conductivity may not be the primary selection factor, a LIQUI-VIEW vortex flow meter can be a suitable alternative.
LIQUI-VIEW vortex flow meters
The LIQUI-VIEW Base series uses the vortex measuring principle. A bluff body positioned in the liquid creates a repeating pattern of vortices. The frequency of these vortices is proportional to the liquid velocity. A piezoelectric sensor detects the vortices and converts them into an electrical signal that represents the flow rate.
LIQUI-VIEW is designed for monitoring low-viscosity, water-like liquids. The compact and lightweight construction makes it suitable for installations where available space is limited.
LIQUI-VIEW advantages
| Typical LIQUI-VIEW liquids
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Depending on the selected model, LIQUI-VIEW Base flow meters are available for flow ranges from 0.5 to 150 l/min.
MAG-VIEW magnetic flow meters
MAG-VIEW flow meters operate according to the magnetic-inductive measuring principle. A magnetic field is generated around the measuring tube. When an electrically conductive liquid moves through this field, a voltage is induced. This voltage is measured by electrodes and is proportional to the average flow velocity of the liquid.
Because the MAG-VIEW has no moving parts and a free pipe cross-section, it can be used in applications where mechanical flow sensors are less suitable. The compact construction also supports installation in machines and systems with limited space.
MAG-VIEW advantages
| Typical MAG-VIEW liquids
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Depending on the version, MAG-VIEW flow meters are available in flow ranges covering approximately 0.0083 to 250 l/min. Metal and cost-optimised plastic models are available for different process conditions and material requirements.
LIQUI-VIEW vs MAG-VIEW
| Criterion | LIQUI-VIEW | MAG-VIEW |
|---|---|---|
| Measurement principle | Vortex measurement using vortices generated by a bluff body | Magnetic-inductive measurement based on the voltage generated by a conductive liquid in a magnetic field |
| Suitable liquids | Low-viscosity, water-like liquids | Water and other electrically conductive liquids |
| Available flow ranges | Model ranges from 0.5 to 150 l/min | Model ranges covering approximately 0.0083 to 250 l/min |
| Moving parts | No | No |
| Liquid conductivity required | Not used as the measuring principle | Yes, the liquid must have sufficient electrical conductivity |
| Output options | 4–20 mA or frequency output, depending on the model | Frequency or 4–20 mA output, depending on the model |
| Typical selection reason | Compact monitoring of water-like liquids with low viscosity | Measurement of conductive liquids without moving parts or an obstruction in the measuring tube |
Applications for liquid flow meters
Water treatmentMonitor water flow through filtration, purification and treatment systems. Flow measurement can help identify process fluctuations and verify that sufficient water is moving through each stage. | Cooling systemsVerify the circulation of cooling water and detect reduced or interrupted flow. This helps maintain stable cooling performance and protect equipment against insufficient heat removal. | Industrial washing systemsMeasure water and suitable cleaning liquids during washing and rinsing cycles. Reliable flow data supports repeatable cleaning processes and efficient liquid consumption. |
Industrial irrigationMonitor the volume of water supplied to individual zones or process areas. Unexpected changes in flow can indicate leaks, blocked lines or changes in water demand. |  |  |