Omega 1640 User guide

COVER REMO

Ø

.875 [22.23]

2X

Ø

9/64 [3.57]

3-3/16 [80.98]

[50.80]

[58.74]

MOUNTING HOLE

6-1/2 [165.10]

Ø7-7/8

CONNECTION

HIGH PRESSURE

SERIES 1640

E

FLOATING CONTACT NULL SWITCH FOR HIGH AND LOW ACTUATION

Differential Pressure Switches

Visual Set Point Adjustment, Adjustable Null Zone

4

[101.60]

Ø9/32 [7.14]

TYP 4 PLACES

1/2

[12.70]

TYP

3 [76.20]

TYP

21/32

[16.66]

3

[76.20]

2 [50.80]

TYP

3-1/8

[79.37]

1/2 CONDUIT

CONNECTION

NPT LOW PRESSURE

1/8 FEMALE

22.5°

1/8 FEMALE NPT

CONNECTION

The unique electric switch design in the Series 1640 Floating Contact Null Switch
for High and Low Actuation is another Dwyer Instruments, 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 oatingcontactswitch (notsnapacting) soitfunctions as anull

switch.

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.

BENEFITS/FEATURES

• Floating “null” switch supports applications requiring two set point actions such as
open and close damper control

• Visiblesetpointindicatorsimpliesoperationandtroubleshooting

• Large diaphragm provides low range accuracy providing precise control

APPLICATIONS

• Damper positioning

• Duct air control

DWYER INSTRUMENTS, LLC | dwyer-inst.com52

SPECIFICATIONS
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oatingcontact(not
snapaction).
Electrical Rating: Non-inductive—2.5
A@110VAC;1.5A@220VAC;1A@
24VDC;0.5A@110VAC; Inductive —

MODEL CHART

Model
1640-0

1640-1
1640-2

Ranges
in w.c.

.01 to 0.2

0.2 to 1.0

1.0 to 4.0

Adjustable Null Span
Min. Set Point Max. Set Point

.01
.02
.03

Process Tubing Options: See page 453 (Gage Tubing Accessories)

.03
.06
.12

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.
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Ib13oz(2.18kg).
Compliance: CE.