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DESIGN FEATURES
The Model 2000 design features are as follows:
• Lightweight (3 lb 9 oz with sensor and 20 ft of cable), water resistant, and rugged. The case is
made of a high impact molded material which protects the electronics from wet environments and
accidental submersions.
• Digital filtering. The sensor electronics uses digital filtering. This does a better job than analog
filtering in rejecting electrical noise that may be present in the flow.
• Noise flag. If there is enough electrical noise present in the flow to interfere with normal operation,
the display will blank out and the noise flag is displayed.
• Conductivity lost detection. A conductivity lost flag is displayed and the velocity readings are
blanked out when conductivity lost is detected. Conductivity lost is usually caused by the sensor
being out of the water.
• Dry sensor power down. The unit stops driving the sensor five seconds after conductivity lost is
detected. This results in a 66% reduction in power consumption, which conserves battery life. If
the sensor is dry for more than 5 minutes, the unit will turn itself OFF.
• Automatic shut off. After five minutes of conductivity lost, the unit will shut itself off thus con-
serving battery life.
• Low battery flag. A low battery flag is displayed when the battery voltage drops below a certain
value. The amount of time the batteries will last after the flag is displayed can vary from an hour
(alkaline) to 15 minutes (nicads). The unit will shut itself off if the voltage drops too low.
• Clear display function. The clear display function clears the display and restarts the filtering.
• Data storage and recall ability. There are 19 memory locations in which to store and recall velocity
measurements.
• Unit of measurement selection. The meter can be switched between English (ft/s) and metric (m/s)
units of measurement.
• Selectable filtering modes for display output. Fluid dynamics near the sensor electrodes may cause
slightly noisy readings. The output can be stabilized by averaging the velocities over a fixed time
period or by a software algorithm that mimics an RC time constant.
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