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The novel electric switch plan in the Series 1640 is another Dwyer Instrument, Inc. development. The Dwyer® Series 1640 Differential Pressure Switch looks like the Series 1630 switches. Be that as it may, the Series 1640 is outfitted with a solitary shaft, twofold toss drifting contact switch (not snap acting) so it capacities as an invalid switch.

Series 1640 Floating Contact Null Switch for High and Low Actuation
Visual Set Point Adjustment, Adjustable Null Zone

As the stomach moves in light of tension changes, it moves the drifting contact to cause exchanging activity at two preset focuses with no exchanging activity between these focuses. The “high” circuit will be shut while rising strain differential arrives at the preset level. The “low” circuit will be shut while falling strain differential arrives at the preset level.

An ordinary illustration of use is to situate mechanized dampers when static tension in a channel framework arrives at an ideal most extreme and reposition the dampers when the static strain tumbles to a pre-laid out least. By utilizing a Pitot tube detecting component the Series 1640 switch can serve similarly to control air speed and keep a steady volume of air in a stock channel.

Product Applications :
* Damper positioning
* Duct air control

Features :
* Floating “null” switch supports applications requiring two set point actions such as open and close damper control
* Visible set point indicator simplifies operation and trouble shooting
* Large diaphragm provides low range accuracy providing precise control