MAINPROBE-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
New to Mainstream is the Mainstream Adaptive Measurement System which adjusts the sensor operation to match the flow conditions. MAMS is a new feature and allows the probe to adapt to the environment in which it is operating, automatically reducing its power consumption where possible. Fundamentally, the MAMS system allows the MainProbe to finish a measurement early if a suitable amount of velocity information has been acquired by the sensor. MAMS works by basing each velocity measurement on processing the same fixed quantity of information. When this information limit has been reached the measurement is terminated (regardless of whether or not the probe has been run for the full specified measurement time).
High sensitivity extends applications to ‘clean’ water
MAINPROBE-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