Dwyer Series 1640: Fulfilling Your Pressure Switch Needs
Dwyer Series 1640 is a floating contact null switch. It's ideal for applications requiring precise control of air pressure or volume. With its adjustable null span and actuation points, you can tailor the switch's behavior to suit your specific requirements.
Key Capabilities:
- Precise pressure control: Adjustable actuation points allow you to set the desired pressure thresholds.
- Floating contact design: Ensures switching action at two preset points, providing a stable and reliable null zone.
- Versatile operation: Compatible with both AC and DC power sources, making it suitable for a wide range of applications.
Dwyer Series 1640: Fulfilling Your Pressure Switch Needs
Dwyer Series 1640 is a floating contact null switch. It's ideal for applications requiring precise control of air pressure or volume. With its adjustable null span and actuation points, you can tailor the switch's behavior to suit your specific requirements.
Key Capabilities:
- Precise pressure control: Adjustable actuation points allow you to set the desired pressure thresholds.
- Floating contact design: Ensures switching action at two preset points, providing a stable and reliable null zone.
- Versatile operation: Compatible with both AC and DC power sources, making it suitable for a wide range of applications.
Model 1640 Floating Contact Null Switch for High and Low Actuation
Specications - Installation and Operating Instructions
Bulletin E-50P7
Model 1640 null switch.
Switching action in the Model 1640 null switch.
Adjusting the “null”.
The MODEL 1640 Floating Contact Null Switch is identical to Dwyer
®
. Series 1630
Large Diaphragm Pressure Switches, except for its electric switch. Model 1640 is
equipped with a single pole, double-throw oating contact switch (not snap action), so
it functions as a null switch.
The drawing above shows the switching action schematically. As the diaphragm moves
in response to pressure changes, it moves the oating 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 usage for this switch is to position motorized dampers when static pressure
in a duct system reaches a desired maximum, and to reposition the dampers when
the static pressure falls to a pre-established minimum. By using a pitot tube sensing
element, Model 1640 can serve in the same way to control air velocity and maintain a
constant volume of air in a supply duct.
CAUTION: Because of the very low electrical rating, the 1640 switch is almost always
used with a relay which has suitable current carrying capability.
Typical Wiring Hook-Up
Rising pressure closes the “high” contact which causes the motor to rotate in a
counterclockwise direction. Decreasing pressure closes the “low” contact and causes
the motor to rotate in a clockwise direction. When the oating contact is in the null zone
there is no switching action and motor is at rest.
Adjustment of the Switch: The “high” actuation
point is indicated on a calibrated scale secured to
the transparent range screw enclosure. Re-setting is
accomplished by turning the adjustment screw with a
screwdriver to the desired setting on scale. The “low”
actuation point is set by adjusting the span of the null
by turning the Span Adjustment Screw on top of the
switch element inside the conduit enclosure. (See
photo above.)
CAUTION: For use only with air or compatible gases.
Note: Special Models are available, including those with weather-proof or explosion-
proof enclosures.
Suggested Specication
Differential pressure switches shall be diaphragm operated to actuate a single pole
double throw oating contact “Null” switch. The pressure differential at which the
electrical switch will be actuated on rising pressure shall be adjustable. Set point
adjustment shall be screw type with set point indicated on a visual scale. The span of
the oating contact switch shall be adjustable. Switches shall be Dwyer Instruments,
Inc. Catalog No. ______ for the required operating ranges.
SPECIFICATIONS
Ambient Temperature Range: -30°F (-34.4°C) for dry air or gas to 130°F
(54.4°C).
Maximum Surge Pressure: 25 psig (172.4 kPa).
Rated Pressure: 10 psig (68.95 kPa).
Pressure Connections: 1/8˝ NPT.
Electrical Ratings: Non-inductive – 2-1/2 amp, 110V A.C.; 1-1/2 amp, 220V A.C.;
1 amp, 24V D.C., 1/2 amp, 110V D.C., Inductive - 1 amp, 110V A.C.; 1/2 amp, 220V
A.C.; 1/2 amp, 24V D.C. De-rate 70 - 80% for very slow pressure changes.
Switch Action: SPDT oating contact (not snap action).
Wiring Connections: 3-screw type, common, high and low.
Weight: 4 lbs., 13 oz. (2.18 kg).
Installation: Diaphragm vertical.
MODEL 1640 SWITCHES - OPERATING RANGES - NULL ZONE
Model
Number Range Inches, W.C. (Pa)
Adujustable Null Span
Min. Set Max. Set
1640-0
1640-1
1640-2
1640-5
1640-10
.01 - 0.2 (2.482 - 49.77)
0.2 to 1.0 (49.77 - 248.8)
1.0 to 4.0 (248.8 - 995.3)
2.0 to 6.0 (497.7 - 1493)
3.0 to 12.0 (746.5 - 2986)
.01 (2.488)
.02 (4.977)
.03 (7.465)
.03 (7.465)
.04 (9.953)
.03 (7.465)
.06 (14.93)
.12 (29.86)
.18 (44.79)
.20 (49.77)
Printed in U.S.A. 6/17 FR# 440284-00 Rev. 3©Copyright 2017 Dwyer Instruments, Inc.
4 [101.60]
3 [76.20]
TYP
1/2
[12.70]
TYP
2 [50.80]
TYP
21/32
[16.66]
Ø9/32 [7.14]
MOUNTING HOLE
TYP 4 PLACES
6-1/2 [165.10]
Ø7-7/8
3-1/8
[79.37]
22.5°
1/8 FEMALE
NPT LOW PRESSURE
CONNECTION
1/8 FEMALE NPT
HIGH PRESSURE
CONNECTION
3
[76.20]
1/2 CONDUIT
CONNECTION
®
INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: 219/879-8000
Fax: 219/872-9057
www.dwyer-inst.com
e-mail: [email protected]
-
1
Dwyer Series 1640: Fulfilling Your Pressure Switch Needs
Dwyer Series 1640 is a floating contact null switch. It's ideal for applications requiring precise control of air pressure or volume. With its adjustable null span and actuation points, you can tailor the switch's behavior to suit your specific requirements.
Key Capabilities:
- Precise pressure control: Adjustable actuation points allow you to set the desired pressure thresholds.
- Floating contact design: Ensures switching action at two preset points, providing a stable and reliable null zone.
- Versatile operation: Compatible with both AC and DC power sources, making it suitable for a wide range of applications.
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