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.
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
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%
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
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
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