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Applications
Open Channel Flow Rate Indication
In this application, a level sensor is measuring the height in a weir and the ProVu is converting that signal to flow rate using the programmable exponent function. All the user has to do is input the corresponding exponent for their weir and the meter will convert the signal to flow. The following information is required for programming the PD6000 for open channel flow rate: 1. The exponent value associated with the flow calculation for the specific weir or flume being used. 2. The zero head, or water depth, mA value from the level transmitter. 3. The mA value from the transmitter for the maximum head, and the flow rate at that level. The level transmitter is normally programmed to provide 20 mA at the maximum head value and flow rate.
Example:
A 120˚ V-notch weir flow formula for millions of gallons per day is shown below. MGD=2.798 H2.5 The exponent component is 2.5. The level transmitter has been programmed so that at zero head, when the water level is at the base of the V-notch, the output is 4 mA. The level transmitter has been programmed so that at the top of the V-notch, at 2.00 ft, the output is 20 mA.1 The coefficient of the flow equation (2.798 in the above example), is not needed for programming the meter; the scaling function of the meter incorporates the coefficient and the head height automatically.
Flume Image Credit to Tracon
Submersible and ultrasonic water level transmitters available, click here to see options.
Round Horizontal Tank Volume Linearizer
In this application, a level sensor is measuring the height in the round horizontal tank and the ProVu is converting that signal to volume using the RHT function. All the user has to do is input the diameter and length of the tank and the meter converts the signal to volume.
DP Flow via Square Root Extraction
In this application, the PD6000 is displaying flow rate by extracting the square root from the 4-20 mA signal from a differential pressure transmitter. The user selectable low-flow cutoff feature gives a reading of zero when the flow rate drops below a user selectable value. Linear 4-20 mA Analog Output For applications where the input was linearized by the ProVu, the 4-20 mA output will represent that linearized value.
Optional Accessories
Optional PDA3400 Series NEMA 4X Plastic Enclosure
The PDA3400 series of internally mounted plastic UL Type / NEMA 4X enclosures for 1/8 DIN Digital Panel Meters and 1/4 DIN PID Controllers provide a convenient way to mount one, two or three Precision Digital meters / controllers to walls and other vertical structures.
Optional PDA18DINSH Stainless Steel Sun Hood
The PDA18DINSH Sun Hood improves the readability of 1/8 DIN digital panel meters when they are mounted in direct sunlight by shading the instrument from the sun. The Sun Hood is made from 18 gauge 316 stainless steel and mounts between the 1/8 DIN digital panel meter and the panel. In addition, a gasket is provided that installs between the Sun Hood and the panel to provide a UL Type / NEMA 4X seal to the panel.
