Electromagnetic Flowmeters
For all applications with conductive liquids

The measurement principle of electromagnetic flowmeters (EMF) is based on Faraday’s law of induction. EMF can measure the volume flow of any electrically conductive liquid medium, even those with low conductivities.

Typical applications include:

  • Water industry: revenue metering, district metering, water abstraction, leakage detection
  • Wastewater industry: transport networks, sewage treatment plants, sludges
  • Food & beverage industry: mixing, dosing and filling of drinks under hygienic conditions, filling systems applications
  • Chemical industry: acids, alkalis, dosing applications, abrasive or corrosive media
  • Pulp & paper industry: pulp, pastes, sludges and other caustic media, liquor, additives, bleaches, colourants
  • Metal & mining industry: media with a high solid content, like ore or excavator mud


  • Minimal or no inlets/outlets
  • All KROHNE EMF are wet-calibrated in a direct comparison of volumes
  • Large choice of liner materials suitable for potable water, wastewater, chemicals, SIP/CIP
  • Measurement independent of flow profile
  • Custody transfer approvals
  • Abrasion and corrosion resistant liners
  • Ceramic measuring tubes and liners for flange and sandwich versions, also with non-wetted electrodes (capacitive flowmeter)
  • Standard device for partially filled pipes
  • PROFINET I/O interface
  • Virtual reference option: grounding electrodes and grounding rings can be left out
  • Electrical conductivity of media can be used for detection of product change
  • For high bubble content, high solids content and pulsating flow
  • Secure handling of rapid media changes and pH jumps
  • Zero-point stability regardless of changes in media properties
  • Nominal sizes DN2.5…3000
  • 3×100% diagnostics (application and device diagnostic, out-of-spec test) exceeds NAMUR requirements
Ultrasonic Flowmeters
For process and utility applications, energy and custody transfer (CT) measurements

Using the transit time method, ultrasonic flowmeters measure liquid and gaseous media.
Typical applications include:

  • Power plants: cooling water and demineralised water, steam, thermal oil (HTF), molten salt
  • Chemical industry: metering of liquid hydrocarbons and low-conductivity liquids, including feedstock, solvents, chemical addition in reactor control metering, demineralised water
  • Petrochemical refineries: feedstock, cooker feed flow, cracking, desulphurisation, residues, blending of crude oil and refined product
  • Petrochemical plants: feedstocks (e.g. naphtha and natural gas), (intermediate) products such as ethylene, propylene, solvents
  • Oil & gas industry: measurement of crude oil and refined product, natural gas, liquefied natural gas (LNG) and biogas; standard and custody transfer applications in production, pipeline transfer and leak detection, loading and off-loading, storage and distribution
  • Water/utilities: demineralised water, water purification, effluent, compressed air
  • HVAC: metering of chilled water and hot water for (custody transfer) energy measurement


  • Complete portfolio for liquid, gas and steam applications
  • Accuracy and reproducibility regardless of medium properties such as viscosity,
    temperature, density and electrical conductivity
  • Diagnostic and compensation functions for disturbed flow profiles and deposits,
    detection of gas entrainments in liquids, etc.
  • No moving parts or components that protrude into the measuring tube
  • Low operating and maintenance costs due to non-wearing parts
  • Excellent long-term stability, no recalibration required
  • High degree of reliability thanks to redundant measuring paths
  • High-temperature versions available
  • Large dynamic range
  • Bi-directional flow measurement
Vortex Flowmeters
For utility applications, advanced energy management and Safety Instrumented Systems (SIS)

Vortex flowmeters are based on the principle of the Kármán vortex street and are used in main as well as auxiliary and supply processes. Capable of compensating for different temperature and pressure conditions, they measure the volume flow of both conducting and non-conducting liquids, industrial gases and steam.
Applications include measurement of:

  • Saturated steam and superheated steam
  • Gross and net heat for energy management systems
  • Hot steam, also for CIP and SIP processes
  • Liquefied gas, wet gas and flue gas
  • Demineralised water and boiler feed water
  • Solvents and heat transfer oil
  • Steam boiler monitoring
  • Compressor output
  • Consumption in compressed air systems
  • Free air delivery (FAD)
  • Burner consumption


  •  Integrated pressure and temperature compensation for fluctuating pressures and temperatures
  • Temperature compensation for saturated steam included as standard
  • Gross and net heat calculation to support advanced energy management
  • Non-wearing, fully-welded stainless steel construction with high resistance to corrosion, pressure and temperature
  • SIL2 certified
  • Redundant Data Management: Easy exchange of electronics without loss of calibration and parametrisation data
  • Use in hazardous areas
Differntial Pressure Flowmeters
For a wide range of process applications
  • For volume, mass flow and density measurement of liquids, gases or steam
  • With 3D linearisation of transmitter
  • Wide range of primary elements and accessories
Mass Flowmeters
For all process and custody transfer (CT) applications

The function of mass flowmeters is based on the Coriolis principle. They allow for a direct measurement of mass flow, density and temperature of liquids and gases as well as calculation of volume flow and mass or volume concentration with a single device.
Typical applications include:

  • Chemical: measurement of concentration or density, bulk loading, batching to reactors, hydrocarbon cracking, aggressive, abrasive or viscous media or media of unknown composition
  • Food & beverage: filling machine applications, measurement of degrees Brix, flow, density, specific gravity, additive components dosing
  • Pharmaceutical: batching, dosing and filling, solvent extraction ultra-pure water measurement
  • Water & wastewater: flocculent dosing, sludge flow and density measurement
  • Pulp & paper: paper stock, pulp, additives, bleaches, colourants
  • Oil & gas: metering skids, bypass density measurement, CNG/LPG dispensers, leak detection, custody transfer applications such as tanker loading, bunkering and pipeline transfer


  • Entrained Gas Management EGM: no loss of measurement with gas entrainments up to 100%
  • Indication or configurable alarm to improve processes by identifying transient gas entrainments
  • Not susceptible to installation effects: can be installed regardless of type of installation (no straight inlets/outlets) and external influences such as tube vibrations
  • Only straight tube measuring devices for custody transfer applications in the highest OIML accuracy class of 0.3, approved to OIML R117/MID
  • Flow rates from 0.0003 to 4,600 t/h
  • Minimal pressure loss with straight tube measuring devices: reduced power consumption of pumps
  • High density accuracy, not affected by medium and temperature changes
  • Suitable for highly viscous media, inhomogeneous mixtures, media with solid content or gas inclusions
  • Modular design for quick and easy replacement of electronics and/or flow sensors
  • Self-draining and easy to clean
  • OPTIMASS 7000 suitable for highly sensitive media as well as media requiring low flow velocity
  • Variety of wetted materials (e.g. for corrosive media): titanium, stainless steel, HASTELLOY®, tantalum, duplex & super duplex
  • Options for secondary containment up to 100 bar/1450 psi (OPTIMASS 2000 up to 150 bar/2176 psi)
  • Turnkey solutions for the operation of batch plants
Variable Area Flowmeters
For simple and cost-effective flow measurement of gases or liquids without auxiliary power

Variable area flowmeters are suitable for measuring pure liquids and gases. They have an upright conical tube made of metal, glass or plastic, in which a float moves freely up and down. The flow through the tube causes the float to rise until the forces are in equilibrium.
Typical applications include:
• Measurement and dosing of additives such as catalysts, surfactants, foam and corrosion inhibitors, caustic soda, chlorine or sulphur substances, etc.
• Inerting of tanks or containers
• Measurement and dispensing of rinsing media (purge meters)
• Sample feed measurement for analyser systems
• Dosing and monitoring of lubricants and coolants for bearings and seals for process pumps and rotating machinery
• Hygienic applications in the food and pharmaceutical industries
• Measurement of gases and chemicals in laboratories and test facilities
• Gas/oil burner consumption measurement


  •  Local indication without the need for auxiliary power
  • Use in hazardous areas
  • Accurate measurement even at very low flow rates (<0.5 l/h)
  • Extended turndown ratio up to 100:1
  • Suitable for low operating pressures
  • Can be used even with short or no straight inlets/outlets
  • Modular display and measuring transducer concept: easy component replacement
  • World’s only all-metal variable area flowmeter with EHEDG certification
  • Flowmeters for nuclear power plants meet requirements of KTA 1401, RCC-E, RCC-M and ASME Section III and we are authorized to manufacture products with ASME N stamp and NPT stamp
  • SIL2 certified
  • Any meter orientation possible: vertical, horizontal or in fall pipes
  • Optional limit switches, current output, totalizer, communication interfaces
Mechanical Flow Controllers

Mechanical flow controllers work via a spring-mounted baffle that changes its position as flow increases. Adjustable switches generate alarms once switching points are reached.
Typical applications include:
• Local indication of flow without power supply – cooling systems, pump protection, lubrication control or cavitation alarm, for instance

Electromagnetic Flow Switch and Flow Meters
  • For measuring electrically-conductive liquids, pastes and slurries
  • Optional digital display
  • No moving parts, maintenance-free
Flow Computers

Experience the new generation of flow computers. With all the features your users demand:

  • Enhanced diagnostics
    The key element for all integrators, and end-users – reducing maintenanceand maintaining uptime; based on complete logging with built-in back-up
  • Multi medium applications
    No limits – from crude to refined, from process water to gas, from steam to condensate
  • Vendor-independent instrumentation
    Use with any meters (not only KROHNE); choose any units (metric, US or all atonce) all on one firmware
  • Modbus mapping & system compatibility
    Easily interfaces with other systems – DCSs, PLCs, Supervisories, SCADA, HMi
  • Advance network integration
    eReporting push, web interfacing, remote monitoring
Paddle Wheel Flowmeters

Paddle wheel sensors may be differentiated by the material used for the paddle wheel (plastic or stainless steel) or on the basis of signal detection/evaluation (coil sensor, HT coil sensor, Hall sensor or optical sensor). Sensors which provide perfect performance for clean, neutral or aggressive liquids in moderate pressures and temperatures

Pitot Tubes

Paddle wheel sensors may be differentiated by the material used for the paddle wheel (plastic or stainless steel) or on the basis of signal detection/evaluation (coil sensor, HT coil sensor, Hall sensor or optical sensor). Sensors which provide perfect performance for clean, neutral or aggressive liquids in moderate pressures and temperatures

Venturi Tubes

Venturi tubes are designed and produced on customers request. The significant advantages of venturi tubes are the high pressure recovery and maintenance free design. Used for applications which do not support high pressures and therefore do not allow much pressure loss. Allows flow-measurements of gases, steam, water, condensates and slurries.

Open Channel Flowmeters

Non-contact ultrasonic level measurement is one of the most versatile level measuring technologies available today but the introduction of the new  ultrasonic level/flow instrument moves these boundaries even further into the next generation. Its wide range of transducers and advanced pulse window echo tracking technology is capable of measuring virtually any liquid or solid and can be used in a wide range of industries from water and waste, to chemical and process, to quarry and aggregate

Orifice Assembles

Orifice plates are used for flow rate measuring in pipe systems. With orifice plates a pressure drop is created. Based on the value of the pressure drop the flow rate can be calculated. Orifice plates are produced in accordance with ISO 5167. All the above items are available in C.S., SUS, PTFE, PVC etc. Others are available on request on customers.

Wet compressed air flow measurement

The ultimate measurement tool for wet compressed air flow measurements. The unique design enables you to take measurements  in the discharge pipe of a compressor under 100% saturated conditions. You can combine the probe with two display module types or with a connector cap without display.

Open Channel Flowmeters

Magnetic resonance multiphase flowmeter for simultaneous measurement of oil, gas and water in the upstream oil and gas industry

  • Single measurement principle; no radioactive source
  • Fully automated inline fluid characterisation
  • Large dynamic range up to 1:60; full bore design
  • Enhanced reservoir management
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