Dwyer Instrument, LLC Model 1640差分压力开关说明说明书
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open and close damper control • Visible set point indicator simplifies operation and trouble shooting • Large diaphragm provides low range accuracy providing precise control APPLICATIONS • Damper positioning • Duct air control
Ø7-7/8
4 3 [76.20] [101.60] TYP
3-1/8 [79.37]
Ø9/32 [7.14] MOUNTING HOLE
TYP 4 PLACES 21/32 [16.66]
3 [76.20]
6-1/2 [165.10]
1/2 CONDUIT CONNECTION
1/8 FEMALE NPT LOW PRESSURE
24 VDC; 0.5 A @ 110 VAC; Inductive — Compliance: CE.
MODEL CHART
Ranges Adjustable Null Span
Model in w.c. Min. Set Point Max. Set Point
1640-0 .01 to 0.2 .01
Differential Press
SERIES 640
FLOATING CONTACT NULL SWITCH FOR HIGH AND LOW ACTUATION
Visual Set Point Adjustment, Adjustable Null Zone
1/2 [12.70] TYP
2 [50.80] TYP
Pressure Limits: 10 psig (68.95 kPa) NPT.
continuous, 25 psig (172.4 kPa) surge. Mounting Orientation: Diaphragm in
Switch Type: SPDT floating contact (not vertical position. Consult factory for other
52 DWYER INSTRUMENTS, LLC |
SPECIFICATIONS
Service: Air and non-combustible,
1 A @ 110 VAC; 0.5 A @ 220 VAC; 0.5
compatible gases.
A @ 24 VDC (de-rate 70-80% for very
.03
1640-1 0.2 to 1.0 .02
.06
1640-2 1.0 to 4.0 .03
.12
Process Tubing Options: See page 453 (Gage Tubing Accessories)
CONNECTION
22.5° 1/8 FEMALE NPT HIGH PRESSURE CONNECTION
The unique electric switch design in the Series 1640 Floating Contact Null Switch for High and Low Actuation is another Dwyer Instrument, LLC innovation. The Dwyer® Model 1640 Differential Pressure Switch resembles the high precision large diaphragm Series 1630 switches. However, the Model 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. BENEFITS/FEATURES • Floating “null” switch supports applications requiring two set point actions such as
snap action).
position orientations.
Electrical Rating: Non-inductive — 2.5 Set Point Adjustment: Screw type.
A @ 110 VAC; 1.5 A @ 220 VAC; 1 A @ Weight: 4 Ib 13 oz (2.18 kg).
Wetted Materials: Consult factory.
slow pressure changes).
Temperature Limits: -30 to 110°F
Electrical Connections: 3 screw type.
(-34.4 to 43.3°C).
Process Connections: 1/8˝ female
Ø7-7/8
4 3 [76.20] [101.60] TYP
3-1/8 [79.37]
Ø9/32 [7.14] MOUNTING HOLE
TYP 4 PLACES 21/32 [16.66]
3 [76.20]
6-1/2 [165.10]
1/2 CONDUIT CONNECTION
1/8 FEMALE NPT LOW PRESSURE
24 VDC; 0.5 A @ 110 VAC; Inductive — Compliance: CE.
MODEL CHART
Ranges Adjustable Null Span
Model in w.c. Min. Set Point Max. Set Point
1640-0 .01 to 0.2 .01
Differential Press
SERIES 640
FLOATING CONTACT NULL SWITCH FOR HIGH AND LOW ACTUATION
Visual Set Point Adjustment, Adjustable Null Zone
1/2 [12.70] TYP
2 [50.80] TYP
Pressure Limits: 10 psig (68.95 kPa) NPT.
continuous, 25 psig (172.4 kPa) surge. Mounting Orientation: Diaphragm in
Switch Type: SPDT floating contact (not vertical position. Consult factory for other
52 DWYER INSTRUMENTS, LLC |
SPECIFICATIONS
Service: Air and non-combustible,
1 A @ 110 VAC; 0.5 A @ 220 VAC; 0.5
compatible gases.
A @ 24 VDC (de-rate 70-80% for very
.03
1640-1 0.2 to 1.0 .02
.06
1640-2 1.0 to 4.0 .03
.12
Process Tubing Options: See page 453 (Gage Tubing Accessories)
CONNECTION
22.5° 1/8 FEMALE NPT HIGH PRESSURE CONNECTION
The unique electric switch design in the Series 1640 Floating Contact Null Switch for High and Low Actuation is another Dwyer Instrument, LLC innovation. The Dwyer® Model 1640 Differential Pressure Switch resembles the high precision large diaphragm Series 1630 switches. However, the Model 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. BENEFITS/FEATURES • Floating “null” switch supports applications requiring two set point actions such as
snap action).
position orientations.
Electrical Rating: Non-inductive — 2.5 Set Point Adjustment: Screw type.
A @ 110 VAC; 1.5 A @ 220 VAC; 1 A @ Weight: 4 Ib 13 oz (2.18 kg).
Wetted Materials: Consult factory.
slow pressure changes).
Temperature Limits: -30 to 110°F
Electrical Connections: 3 screw type.
(-34.4 to 43.3°C).
Process Connections: 1/8˝ female