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Floating contact switch | range 0.2-1.0″ w.c. | adj. span | .02 min. set | .06 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 0.2-1.0″ w.c., adj. span, .02 min. set, .06 max. Set.^^
Fast Shipping and Professional Packing
Our long-standing relationship with UPS FedEx DHL and other global carriers allows us to offer an array of shipping services. Our warehouse personnel are expertly trained and will wrap your items according to our precise and precise specifications. Your goods are thoroughly checked and properly secured before shipping. Every day, we send thousands of packages to customers from all over the world. This is a testament to our commitment to be the largest online retailer globally. Both Europe and the USA have distribution and warehouse centres.
Note: Orders containing multiple items will have a different processing time for each item.
Before shipment, all ordered products will be thoroughly inspected. The majority of orders are delivered within 48 hours. Delivery time ranges between 3-7 days.
Returns
Stock is dynamic. It's not completely managed by us, as we're involved with several parties such as the factory and our storage. Therefore, the actual inventory could alter at any time. It is possible that stocks could be depleted after the order has been made.
The period of time is 30 days. If 30 days have gone in the past since you purchased, unfortunately we can't offer an exchange or refund.
In order to be eligible for a refund the item must be in good condition and in the same condition that you received it. It must also be in the original package.
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