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Water flow

Accurate flow and discharge measurement has been a core competency of OTT Hydromet since we created our first flow meter in 1875. Choose from a variety of either portable or stationary measurement options using different measurement technologies, including mechanical, acoustic, Doppler, and more.

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        Hach FLO-DAR

        Flo-Dar (Marsh McBirney)

        superrior non-contact sensor designed to measure flow in open channels - OTT - Hach

        Hach Flow’s FLO-DAR® AV Sensor is a non-contact sensor designed to measure flow in open channels using radar technology with patented algorithm’s to capture highly-accurate flow data.

        • fix installed, mobile
        • Flow velocity, water level
        • Non-contact pulse radar
        • Perfect solution for difficult flow conditions, optional surcharge velocity sensor
        • Radar: 0.23 ... 6.10 m/s , Water level: 0 ... 152.4 cm / Optional 0 ... 6.1 m
        submersed acoustic doppler flow sensor

        SubAV (American Sigma)+ Hach AV 9000

        acoustic doppler measuring technology

        The robust Hach Submerged AV Sensor is a submersed acoustic doppler flow sensor with advanced diagnostics and filtering options, making it ideal for challenging flow conditions.

        • fix installed, mobile
        • Flow velocity
        • Ultrasonic
        • Proven ultrasonic-doppler-sensor "Bottom-up"; advanced diagnostic tools and settings for difficult sites
        • -1.52 ... 6.1 m/s
        • ±2% of measured value
        Robust flow logger

        Hach FL900

        Robust Flow Logger

        The portable Hach FL900 Series Flow Logger works with any of Hach’s sensors: contactless FLO-DAR® AV, Sigma Submerged AV and FLO-Tote® 3 AV.

        • Mobile
        • Plug and play sensor ports,easy installation/versatile mounting options
        OTT cable way system in operation

        OTT Cable Way Systems

        Stationary systems for vertical based discharge measurements

        The rugged stationary cable way systems made by OTT provide safety in vertical method based discharge measurement. They are type-tested and designed for long-term dependable operation at rivers or canals.

        • Fixed installation
        • Maintenance-free cable way system for span lengths of up to 160 m. All components are maintenance free. Oil-free gas pressure spring tensioner for span lengths of above 20 m. Electrical or optionally mechanical double-drum winch.
        • Vertical method based discharge measurements
        • Rivers and canals
        Fixed installation of water flow sensor

        OTT SLD - Side Looking Doppler Sensor

        Water flow meter for longterm data collection of velocity and discharge measurements

        The OTT SLD uses acoustic Doppler technology for continuous measurement of water velocity and level in streams, rivers, and canals.

        • Fixed installation
        • Acoustic
        • Flow velocity
        • Side-Looking-Doppler for continuous discharge measurement in rivers and open channels. Discharge calculation based on velocity - index - method. Integrated vessel filter algorithm, Modbus interface and output of total volume of flow (max. interval 1 day).
        • ± 10 m/s
        • ± 1 % of measured value ± 0.5 cm/s
        Handheld electromagnetic stream flow meter with automatic discharge calculation

        OTT MF pro - Water Flow Meter

        Handheld electromagnetic water flow meter with automatic discharge calculation

        The OTT MF Pro is a user-friendly, low maintenance electromagnetic current meter for cost-efficient in-stream discharge measurement.

        • Spot
        • Electro-magnetic
        • Flow velocity and water depth
        • Low maintenance magnetic - inductive probe with level measurement for reliable flow measurements. Works well in low flow and turbulent conditions, cross - sections with weed growth and pollution. Applicable in streams and conduits.
        • 0 … 6 m/s
        • ± 2% of measured value ± 0.015 m/s ( 0 … 3 m/s ) and ± 4% of measured value ± 0.015 m/s ( 3 … 5 m/s )
        OTT Qliner 2 – Doppler technology for mobile discharge measurements

        OTT Q Liner2 ADCP Boat

        Acoustic Doppler Current Profiler for surface water discharge measurement

        OTT Qliner 2 – Doppler technology for mobile discharge measurement in rivers and channels. The robust system delivers reliable measurements even in moving sole conditions or at flood situations.

        • Spot
        • Acoustic
        • Flow velocity and depth
        • Acoustic water profiling instrument for section by section discharge measurements in rivers and open channels up to 20 m water depth. Operated by PDA user software with Bluetooth data transmission. Low flow resistance and high boat stability.
        • ± 10 m/s
        • ± 1% of measured value ± 0.5 cm/s
        Universal current meter OTT C31

        OTT C31

        OTT C31 Universal Current Meter for discharge measurements

        OTT C31 Universal current meter for flow velocity measurement in rivers and open waterways. Rod-mounted or as cable-suspended current meter from a bridge, boat or on cable ways.

        • Spot
        • Mechanical
        • Flow velocity
        • C31 - the original. Taditional hydrometric current meter with proved quality for use with wading rods, from bridges and at cable-way installations
        • 0.025 ... 10 m/s
        • ± 2%
        Small - Mini Current meter for discharge measurements OTT C"

        OTT C2

        Small - Mini Current meter for discharge measurements OTT C"

        The OTT C2 small current meter for discharge measurements for shallow waters in small rivers, channels, laboratories and river models.

        • Spot
        • Mechanical
        • Flow velocity
        • OTT C2 - the original for wading rod measurements in shallow streams, applicable from 4 cm water depth.
        • 0.025 ... 5 m/s
        • ± 2%
        Acoustic Digital Current Meter

        OTT ADC - Acoustic Digital Current Meter

        Handheld, acoustic water flow, velocity meter for in-stream point velocity measurements

        The OTT Acoustic Digital Current meter (ADC) delivers consistently accurate results with the most advanced acoustic technology available for point velocity measurement.

        • Spot
        • Acoustic
        • Flow velocity, depth
        • Latest state of the art ultrasonic Doppler technology for high accurate velocity measurements. Maintenance free sensor with integrated depth measurement, graphical step by step user guidance and discharge calculation according to ISO 748 and USGS standard
        • -0.2 … 2.4 m/s
        • ± 1% of measured value ± 0.25 cm/s