Floating contact switch | range 1.0-4.0" w.c. | adj. span | .03 min. set | .12 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
WASHING INSTRUCTIONS:
Machine wash separately in cold water on a gentle cycle. Tumble dry separately on low heat. Add QE Home Wool Dryer Balls to reduce wrinkles and increases drying efficiency. Touch up with a low heat iron as needed. Do not bleach or dry clean.
