mainstream™

MAINPROBE-Vu RS485 MODBUS

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
diagnostics

  • 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
  • Sophisticated ultrasound processing ignores spurious signals
  • Ultrasound signal quality monitor confirms measurement integrity
  • Real-time processing of velocity signals thereby reducing power consumption
  • Quick to install – no weirs or flumes
  • Powerful, easy to use PC software simplifies commissioning
  • Streamlined velocity probe eliminates fouling and reduces flow disturbances
  • Distances up to 500 meters from system unit to velocity sensor

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

measurands and units

Power Supply Voltage : 10mV resolution
Fluid Temperature : °C, °F: 1° resolution
Signal Quality : 0.1% resolution
Velocity : mm/s, cm/s, m/s, in/s, ft/s, ft/min: 1 mm/s resolution

velocity measurement

Transducer Type : Submerged sensor containing complete ultrasonic transmitter, receiver and signal processing chain.
Method : Phase Coherence time delay measurement which determines the time for tracers carried by the flow to travel
a fixed distance (~ 0.75 mm).
Minimum Operating Depth: 30 mm
Velocity Range : -5 m/s to -10 mm/s and 10 mm/s to 5 m/s
Resolution : Better than 1 mm/s
Measurement Integrity : Ultrasound signal quality monitor gives the percentage of the measurement time that the received
ultrasound signal contains verifiable velocity information.
Mainstream Adaptive
Measurement System :
Automatically adjusts the ultrasonic signal acquisition time so that each velocity measurement is based on the same quantity of information

power supplies

DC Supply : 6*-28Vdc at 27mA maximum current whilst measuring and less than 1.8mA idle (listening for incoming
commmands); *maximum 1 unit load

communications

Modbus : Modbus RTU protocol over half-duplex RS485 connection. Address range 1-247. 1⁄8 unit load.
Drive capability 10 unit loads. Baud rates 2400, 4800, 9600, 19200 (default), 38400, 57600 and 115200

system unit

Materials: Streamlined PVC-U moulding and polyurethane cable
Dimensions: 105 mm long x 50 mm wide x 20 mm high
Cable: Six core with 2 x power; 2 x twisted pair comms; screened
8 mm diameter polyurethane cable. Minimum static bend radius 60 mm
Weight: 850 gm including standard 10 m cable length
Maximum Cable Length 500 m
Environmental Protection Totally encapsulated to IP68
Operating Temperature: -10°C to 80°C

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To order additional products please call: +44 (0) 01535 654333 or email: support@mainstream-measurements.com

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product support

To order additional products please call: +44 (0) 01535 654333 or email: support@mainstream-measurements.com

Fixed Quick Start Video

Calibration Video

Software Video

Distributors
User Manual
Data Sheets & Comparison Chart
Support Helpline
Trouble Shooting
Sensor Installation Requirements