- Sign In
- |
- Sign Up
- |
- My Quote (0)
- |
- CART (0)
Visual Set Point Adjustment, Adjustable Null Zone. Equipped with a single pole, double throw floating contact switch (not snap acting) so it functions as a null switch.
Visual Set Point Adjustment, Adjustable Null Zone. Equipped with a single pole, double throw floating contact switch (not snap acting) so it functions as a null switch.
The Dwyer 1640-1 Floating Contact Null Switch for High and Low Actuation has a range from 0.2-1.0" w.c., adj. null span, .02 min. set, and .06 max. set.
The unique electric switch design in the 1640 is another Dwyer Instrument, Inc. innovation.The Dwyer® Model 1640 Differential Pressure Switch resembles the Series 1630 switches. The Model 1640, however, is equipped with a single pole, double throw floating contact switch (not snap acting) so it functions as a null switch.
Drawing shows the switching action schematically. 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 Model 1640 switch can serve in the same way to control air velocity and maintain a constant volume of air in a supply duct.
| Service | Air and non-combustible, compatible gases |
| 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 | Single-pole double throw (SPDT) floating contact (not snap action) |
| Process Connections | ⅛" (0.3175 cm) NPT |
| Electrical Rating | Non-inductive: 2.5 A at 110 V AC, 1.5 A at 220 V AC, 1 A at 24 V DC, 0.5 A at 110 V AC Inductive: 1 A at 110 V AC, 0.5 A at 220 V AC, 0.5 A at 24 V DC (De-rate 70 to 80% for very slow pressure changes) |
| Connections | Electrical: 3 screw type, common, normally open and normally closed Process: ⅛" female NPT |
| Mounting Orientation | Diaphragm in vertical position |
| Set Point Adjustment | Screw type |
| Agency Approvals | CE |
| Weight | 4 lbs (2.18 kg) |
Click on a category to view a selection of compatible accessories with the Dwyer 1640-1 Differential Pressure Switch (0.2-1.0"w.c.) with SPDT switch.
| Service | Air and non-combustible, compatible gases |
| 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 | Single-pole double throw (SPDT) floating contact (not snap action) |
| Process Connections | ⅛" (0.3175 cm) NPT |
| Electrical Rating | Non-inductive: 2.5 A at 110 V AC, 1.5 A at 220 V AC, 1 A at 24 V DC, 0.5 A at 110 V AC Inductive: 1 A at 110 V AC, 0.5 A at 220 V AC, 0.5 A at 24 V DC (De-rate 70 to 80% for very slow pressure changes) |
| Connections | Electrical: 3 screw type, common, normally open and normally closed Process: ⅛" female NPT |
| Mounting Orientation | Diaphragm in vertical position |
| Set Point Adjustment | Screw type |
| Agency Approvals | CE |
| Weight | 4 lbs (2.18 kg) |
Click on a category to view a selection of compatible accessories with the Dwyer 1640-1 Differential Pressure Switch (0.2-1.0"w.c.) with SPDT switch.
