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It provides a cost-effective and reliable method of monitoring flow in a variety of environments, including salt, fresh and effluent water, from shallow streams to tidal waterways. The meter benefits from the design of the impeller bearings, which give low threshold velocity and consistent performance. Available as either wading or a suspension set, all systems are supplied with the Model 0012B real-time control display unit.
· Lower stall speed - greater surface area means that the minimum water speed required to turn the impeller is lower. · Higher top speed - longer pitch means less revolutions for any given speed of water, so a greater speed range is possible. · Higher accuracy - any variations in manufacturing tolerance, wear and tear, or deployment technique will have less effect on the larger impeller than on the small one.
Both instruments are offered as standard with a “Group Calibration”, according to BS ISO 2537:2007. Within limits, the performance of an impeller is primarily a function of its shape, provided that its bearings work and it is spinning freely. Since all our impellers are manufactured to the same standard shape, we guarantee that they fall within the tolerances of the group calibration, as given above. Note that the Group Calibration for each impeller is up to 3m/s - calibration above 3m/s is by linear extrapolation. Specific calibration of any individual impeller may be performed on request, at Valeport’s own premises up to 1m/s, or through a third party for higher speeds
The Model 001 Flow Meter is supplied with a dedicated surface display unit, the Model 0012B. As the impeller rotates, it opens and closes a magnetic reed switch, generating pulses. The Model 0012B measures the frequency of these pulses, and uses the calibration equation to calculate speed of flow from the pulse frequency. Data may be averaged over any number of seconds from 1 to 600, or according to number of impeller revolutions. The Model 0012B will display real time speed data, as well as the result of the data average, together with a Standard Deviation figure to give added data confidence. A solid-state memory records all results, and the data may be downloaded to PC using the RS232 interface lead supplied.
System is supplied with CDU Express Windows based PC software, for data extraction from display unit. CDU Express is license free.
The Model 106 is the ideal instrument for coastal and estuarine applications and other light-duty survey work.
The MIDAS ECM is one of only a few multiparameter current meters that allow real-time operations over several thousand metres of cable, as well as autonomous deployment.