DEA
Engineering Company
Nutating
Micro Flowmeter
Mechanical Installation & Operating Considerations
Electronic Installation & Operating Considerations
Installation and Maintenance Instructions
PRINCIPLE OF OPERATION
FIGURE
1: Principle Of Operation
Note that a volume of fluid is captured in the left chamber in position 1 and the right chamber in position 3. These volumes are displaced in each full cycle by the forces described below:
Position 1 shows the nutator in its farthest right travel point within the chambers. The beam has been angled to the point shown because it is constrained to move with the nutator. The nutator has most of its upper surface same time, the left piston, being part of the same unit, is forced upward and in a counter - clockwise direction. The result of this action is shown in position 2.
Position 2 shows the right side of the right piston and the upper right side of the left piston exposed to the higher up stream pressure while their opposite sides are exposed to the lower down stream pressure. The resultant forces cause the right piston to move to the left and in a clockwise direction. At the same time, the left piston, being part of the same unit, is forced to the left and in a counter - clockwise direction. The result of this action is shown in position 3.
Positions 3 and 4 depict the positions and forces on the nutator and beam in exactly the opposite directions of those in positions 1 and 2.
This process repeats itself in a continuous flow mode at the rates of 1 to 230 complete cycles per second proportionately to the fluid flow through the meter. In the FMTD4 Flowmeter, each cycle displaces approximately .02 cc. Approximately 200,000 cycles will displace one gallon. The FMTD20 displaces approximately .1 cc per cycle.
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