Nivus initially demonstrated a prototype NivuFlow Stick in 2018 in response to the demand for a simple but accurate tool for measuring discharge flow rates in streams, rivers and channels.
Christian Koch, head of product management at Nivus, said: “This is a significant achievement. The calibration certificate resulted from a series of stringent tests and follows the award of a similar verification certificate from NIWA, the National Institute of Water and Atmospheric Research in New Zealand.
“We already have regulatory customers as well as water companies, consultancies, researchers and academia, but third-party verification will provide users with the assurance that they can now measure flow quickly, easily and accurately; confident in the knowledge that they are using an accurate, independently tested device.”
The NivuFlow Stick is a portable instrument for delivering flow velocity measurements utilising the ultrasonic cross-correlation measurement principle.
According to Nivus, this technology can measure water velocities at different water depths simultaneously and with high resolution. As a result, even relatively unskilled operators can derive an accurate flow velocity curve quickly and easily.
Operating procedures are driven via smartphone or tablet, and data is displayed in real-time and shared on-site via WLAN (wireless local-area network). Importantly, any deviations in measurement quality by the NivuFlow Stick are also displayed, and this quality indication is stored with the data.
The NivuFlow Stick is said to be ideal for discharge measurements in streams and small rivers, as well as for checking the accuracy of fixed flow monitoring equipment.