Micro Flowmeter DEA Engineering Company

fluid meter for low flow rates
Nutating Micro Flowmeter

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Electronic Installation & Operating Considerations

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Micro Flowmeter - Electronic Functional Diagram1. A twisted, shielded, 18 gauge, 3 or more conductor cable is recommended to minimize interference. If the Microflowmeter signal at the electronics is less than required, use a larger gauge wire. If this does not effect the desired result, a repeater may be required. The two ground temminals should be jumpered at the electronics. Power and signal wires should be shielded. Only one end of the shield should be connected to ground. [Never use the shield as a signal or power conductor.]

2. When using inductive devices such as relays, motors, or solenoids, care must be taken to avoid voltage transients which result when these devices are switched on and off. These transients can often be strong enough to interfere with [and even damage] system electronics. If the inductive devices are DC, a suppression diode should be placed across the coil as shown in Figure 1.

Micro Flow Meter - Electronic Installation and Operating ConsiderationsOn AC systems, a type of transient suppression device called a Varistor [MOV] should be used. The power should be controlled by a solid state relay which switches at zero voltage. The power supply driving the inductive devices should not be used to drive the system electronics. The supply for the electronics should have an AC line filter either integral with the supply or as a separate module. It is strongly recommended that wires which control the inductive devices not be bundled over long distances with sensor signal wires, even if these wires are shielded.