HYDREKA - Model Mainstream IV -Open Channel Flowmeter

The Mainstream is used:

• either in portable configuration, for survey and diagnostic work, for precise flow data in sewer networks,
• or in fixed configuration, for regulatory works and overflow survey.

The Mainstream embeds a CPU, a level sensor and a velocity sensor:

• Level is measured by ultrasonic probe or using a piezo-resistive sensor,
• Velocity is measured by a Doppler-effect velocity sensor.

The Mainstream is the only flowmeter that measures actual mean velocity:

• Accurate measurement, irrespective of downstream effect,
• Constant performance in stable conditions or in transient conditions.
• Suitable for infiltration water measurement, due to its signal quality at low velocities, down to 1 cm/s,
• All our sensors are calibrated on our own calibration benches, with COFRAC interface.

• Level: by pressure measurement using a piezo-resistive level probe.
• Velocity: by Doppler system using a Doppler-effect velocity sensor. An ultrasonic beam is emitted, along the pipe interior, by an immersed probe. The ultrasonic signals are reflected by the suspended particles in the water. The reflected signals are then analysed to determine the mean water velocity.

MAINSTREAM can be run under WINFLUID, from programming to file processing. Velocity histogram; a histogram shows the velocity distribution (positive and negative) over the entire water depth. The flow is then computed using all these values, and incorporates downstream effects.

The system has its own profile generator. The most common forms are predefined, and the operator can also develop profiles specific to a particular application. Mainstream takes into account the selected profile, and the deposit, when computing the flow.