MainProbeX-Vu RS485 MODBUS is a low-power, streamlined ultrasonic flow velocity sensor with a 10 mm/s to 5 m/s bi-directional measurement range and 1 mm/s resolution. The minimum operating depth is 30 mm. The flow velocity measurement is temperature corrected for variations in the speed of sound.
Measurements are accessed via an RS485 Modbus RTU interface.
Features include measurement on demand and timed measurement refresh, while the Mainstream Adaptive Measurement System adjusts the sensor operation to match the flow conditions. Signal quality indication provides measurement integrity monitoring with velocity histograms and velocity signal capture for diagnostics.
measurement principle
MainProbeX-Vu RS485 MODBUS operates immersed in the flow and transmits ultrasound into the liquid to create a zone of inspection. Bubbles and solid particles carried through this zone by the flow, even when present in only minute quantities, reflect ultrasound back to the probe.
The received ultrasound is processed to extract bursts of signal containing verifiable velocity information. Only these signals bursts are used to determine the flow velocity, the remainder of the signal is ignored, thereby ensuring measurement integrity. The fraction of the total signal processed is the signal quality, an important metric for monitoring measurement performance
Each signal burst is processed to extract the burst velocity. A measure of the flow temperature is used to correct this velocity for changes in the speed of sound. The burst velocities are used to construct a velocity histogram. Analysing this histogram gives the mean flow velocity.
To guarantee consistent measurement performance under all operating conditions, the Mainstream Adaptive Measurement System automatically adjusts the ultrasonic signal acquisition time so that each velocity measurement is based on the same quantity of information.
