The OTT SLD is a measurement system for continuous measurement of water velocity and level in streams, rivers, and canals. The sensor employs the acoustic Doppler principle to reliably measure flow velocity in a variety of naturally occurring conditions, including during most flood events.
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
Equipped with two horizontal ultrasonic transducers “looking sideways” into the flow (Side Looking Doppler) to measure water velocity.
An optional vertical transducer and integrated pressure cell measures the water level.
All measurement values are analyzed, verified and processed by an integrated signal processor, before being used in the calculation of discharge.
Velocity measurements from up to nine cells are used, along with measured water level, to calculate discharge either internally in the OTT SLD or externally in a data logger.
All measurements can be retrieved using SDI-12, RS485 , RS232 or Modbus RTU protocols and are available for storing in a data collection platform, such as the OTT netDL station manager.
Examples of Use
Reliable performance in waters with high sediment load and flood situations
Applicable in natural rivers, streams, shipping-, irrigation- and service water canals
Also suitable for small waterbodies (smallest cell size 20 cm)
OTT SLD – CE Konformitätserklärung | Declaration of Conformity | Declaration de Conformité