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1640 Floating Contact Null Switch
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1640 Floating Contact Null Switch Series 1640 Floating Contact Null Switch for High and Low Actuation Visual Set Point Adjustment, Adjustable Null Zone The unique electric switch design in the Series 1640 is another Dwyer Instrument, Inc. innovation. The Dwyer® Series 1640 Differential Pressure Switch resembles the Series 1630 switches. However, the Series 1640 is equipped with a single pole, double throw floating contact switch (not snap acting) so it functions as a null switch. As the diaphragm moves in response to pressure changes, it moves the floating contact to cause switching action at two preset points with no switching action between these points. The "high" circuit will be closed when rising pressure differential reaches the preset level. The "low" circuit will be closed when falling pressure differential reaches the preset level. A typical example of usage is to position motorized dampers when static pressure in a duct system reaches a desired maximum and reposition the dampers when the static pressure falls to a pre-established minimum. By using a Pitot tube sensing element the Series 1640 switch can serve in the same way to control air velocity and maintain a constant volume of air in a supply duct. CAUTION: FOR USE ONLY WITH AIR OR COMPATIBLE GASES. Product Applications Damper positioning Duct air control ModelDescription 1640-0Floating contact null switch, range .01-0.2" w.c., adj. null span, .01 min. set, .03 max. set. 1640-1Floating contact null switch, range 0.2-1.0" w.c., adj. null span, .02 min. set, .06 max. set. 1640-10Floating contact null switch, range 3.0-12.0" w.c., adj. null span, .04 min. set, .20 max. set. 1640-2Floating contact null switch, range 1.0-4.0" w.c., adj. null span, .03 min. set, .12 max. set. 1640-5Floating contact null switch, range 2.0-6.0" w.c., adj. null span, .03 min. set, .18 max. set. Specifications Service:Air and non-combustible, compatible gases. Wetted Materials:Consult factory. Temperature Limits:-30 to 110°F (-34.4 to 43.3°C). Pressure Limits:10 psig (68.95 kPa) continuous, 25 psig (172.4 kPa) surge. Switch Type:SPDT. Electrical Rating:Non-inductive: 2.5 A @ 110 VAC, 1.5 A @ 220 VAC, 1 A @ 24 VDC, 0.5 A @ 110 VAC; Inductive: 1 A @ 110 VAC, 0.5 A @ 220 VAC, 0.5 A @ 24 VDC. (De-rate 70-80% for very slow pressure changes.) Electrical Connections:3 screw type, common, normally open and normally closed. Process Connections:1/8" female NPT. Mounting Orientation:Diaphragm in vertical position. Consult factory for other position orientations. Set Point Adjustment:Screw type. Weight:4 lb 13 oz (2.18 kg). Agency Approvals:CE. 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
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We are leading dealer and distributor of Magnetic Contact Switches in Noida, Greater Noida and Ghaziabad. Magnetic Contact Switches can be added to existing wired Alarm Systems. They are ideal for protecting doors, windows and patio doors and any opening device such as a drawer or cupboard for example. In the event of contact being broken then the alarm will be activated immediately. Magnetic Contacts are perfect for use in situations where it is not suitable to fit PIR sensors, for example where there are pets or animals.Magnetic Contact Switches when paired with permanent magnets present an ideal method of sensing and detecting movement, proximity, metal detection, and liquid level and flow measurement.Magnetic Contact Switches come in hundreds of different sizes and shapes to meet a multitude of different application requirements. Reed Sensors are available in contact forms A, B, C, D, & E with power ratings up to 100W. They do well in long operating life applications if switching relatively low voltages and currents with life expectancy up to 1 billion operations.
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