Greyline Instruments AVFM 5.0 Ultrasonic Flow Meter


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The AVFM 5.0 ultrasonic flow meter measures both level and velocity to calculate flow in an open channel or pipe. The meter can measure forward flow velocity up to 20 ft/sec (6 m/sec) and reverse flow up to 5 ft/sec (1.5 m/sec). The electronics and software sample and average flow rates continuously to provide stable readings. The submerged velocity/level sensor is suitable in pipes with pressure up to 10 psi. No special set-up or adjustment is required. Minimum recommended pipe diameter is 6″ (150 mm).

Setting up and using the AVFM 5.0 is simple. The ultrasonic sensor mounts inside the pipe or on the bottom of a channel with a stainless steel mounting bracket and a single screw into the bottom of the pipe or channel. No special compounds, tools or hardware are required. The sensor is completely sealed with no orifices or ports. Careful selection of sensor mounting location results in best performance and maintenance-free operation. Locations where sediment builds up should be avoided. Best possible accuracy will result when the water is not highly turbulent and where velocity is evenly distributed across the channel. The channel should not have drops or direction changes immediately upstream of the sensor mounting location. Pipe or channel slope should not exceed 3%.

The flowrate and total flow can be viewed on the AVFM 5.0’s large backlit LCD display. The unit can be connected to external devices with three 4-20mA outputs and two control relays. Choose the built-in data logger option if you want the AVFM 5.0 to store time and date stamped flow values at 10 second to 60 minute intervals. Daily flow reports are automatically created. Windows software is included to display log files in graph and table formats, change measurement units and generate flow reports.

Calibration is as simple as entering the pipe diameter or channel dimensions and letting the AVFM 5.0 automatically compute and display flow volume.


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