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Floating contact switch | range .01-0.2″ w.c. | adj. span | .01 min. set | .03 max. Set.
Series 1640 Floating Contact Null Switch for High and Low Actuation
The unique electric switch design in the Series 1640 is another Dwyer Instruments 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 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
- Floating “” switch supports applications requiring two set point actions such asopen and close damper control
- Visible set point indicator simplifies operation and trouble shooting
- Large diaphragm provides low range accuracy providing precise control
- Series
- 1640 Floating Contact Null Switch for High and Low Actuation
- Category/Type
- Pressure
- Type
- Differential Pressure
- Series
- 1640 Floating Contact Null Switch for High and Low Actuation
- 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.
Resources
^^Floating contact switch, range .01-0.2″ w.c., adj. span, .01 min. set, .03 max. Set.^^
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Orders with more than 1 item are given processing time according to each item.
Prior to shipment, all purchased items will be thoroughly inspected. The majority of orders are delivered within 48 hours. The delivery time is estimated to be between three and seven days.
Returns
Due to multiple parties, including the factory and the warehouse, we are unable to effectively manage inventory. The stock can change at any moment. It is possible that your order may be out of stock after the order has been placed.
Our policy lasts thirty days. If you don't receive your item within 30 days, we are unable to offer either a return or exchange.
To be eligible for a refund, your item must be in good condition and in the same state that you received it in. The item must be in its original packaging.
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