The rivers, streams, irrigation canals, and snowy terrain surfaces can be controlled by using ultrasonic level sensors, hydrostatic pressure transducer or cable displacement transducers attached to a float.
The flow can be considered as a function of the difference in level over a weir or through a channel. The flow characteristics are consistent with this assumption, and a level change is proportional to a change in the flow. This technique for the calculation and control of flow is called «open channel» and is a reliable way to relate changes in the level surface with changes in flow. An alternative for measuring open channel, the ultrasonic Doppler velocity sensor submersible with a hydrostatic pressure sensor integrated.
The controller designed to calculate the flow, based on changes in level, uses a table of coefficients that mathematically simulate the flow due to the limitation and the associated friction. May modulate or monitor the flow and changes in level by controlling the position of the gate using a displacement transducer cable.
Telemetry and registration can be added to the controller to provide remote control of the flow. Communication is available in many formats, including modem, radio, and telephone using forms approved by the agencies of measurement standards.
Contactless ultrasonic level meter all in one. Being compact it has everything needed for level measurement: sensor + control + electronic display. Configurable via keypad or PC. With 4-20mA output and 2 relays. Ranges 3, 6 and 10 meters.