DEA
Engineering Company
Nutating
Micro Flowmeter
Mechanical Installation & Operating Considerations
Electronic Installation & Operating Considerations
Installation and Maintenance Instructions
GENERAL
The DEA Microflowmeter utilizes a small nutating element to displace a fixed volume of liquid in each cycle. [Please refer to Figure 1 and Principle of Operation on Page 2 for a description of this cycle]. The motion of the nutator [nutating element] is detected via a magnetic coupling between a small magnet, integral with the nutator, and a ferromagnetic "pickup" wire located within the electronics housing. The motion of the nutator/wire is sensed electronically. Each complete or partial nutator cycle results in a corresponding complete or partial sine wave. This "raw" signal is conditioned to produce 5 volt pulses through an open collector [NPN transistor] with an integral 200 ohm output resistor. [Please refer to Figure 3 on Page 4 for a functional block diagram of the Microflowmeter electronics.] The exact displacement of each meter is determined empirically prior to shipment and supplied with the meter. This "calibration factor" is used to scale the pulses in display meters or computers to determine the volume and rate of liquid passing through the Microflowmeter.
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