Dwyer 1831 Series User manual

Brand: Dwyer

Model: 1831 Series

Type: User manual

Dwyer 1831 Series offers precise differential pressure control with its DPDT switch and manual reset, eliminating the need for power, reducing installation costs, and simplifying system design. Its dual control contacts activate simultaneously, enhancing system reliability. Suitable for HVAC applications and high duct static cutout installations, the 1831 Series ensures accurate set point adjustment and repeatability.

DWYER INSTRUMENTS, LLC | dwyer-inst.com52

Differential Pressure Switches PRESSURE

DPDT LOW DIFFERENTIAL PRESSURE SWITCHES

Manual Reset, No Power Required

One of our most popular differential pressure switches is now available with a

DPDT switch and manual reset. The Series 1831 DPDT Low Differential Pressure

Switches combine small size with 4% set point repeatability. Absolutely no power

is required to operate the DPDT switch. Set point adjustment on the switch is easily

accessible for modifying the set point.

The Series 1831 DPDT Low Differential Pressure Switches with Manual Reset eliminate

common problems associated with typical high duct static cutout installations. Since

the 1831 requires absolutely no power to drive its outputs, a separate power loop

and its associated additional wiring and conduit is alleviated, reducing material and

labor installation costs. Both control contacts of the Series 1831 activate at the same

time. The potential of the lead switch shutting down the fan preventing the lag switch

from sending an alarming signal to the DDC is no longer a probable system liability.

Potential costly maintenance calls are diminished. Unlike typical switches that possess

only a single conduit entry for both control loops, the Series 1831 provides two conduit

connections simplifying wiring while eliminating additional conduit tees.

BENEFITS/FEATURES

• No power to operate DPDT switch means no additional wiring or conduit reduces

material and installation labor costs

• Easyaccessformodifyingsetpointsimpliesadjustment

• Both control contacts activate at the same time eliminating system issues where lead

switch activities prevent the lagging switch from sending a signal

APPLICATIONS

• High duct static cutout applications

3-11/16

[93.65]

RESET LEVER

3-5/8

[92.08] 1-3/32

[27.76]

1-7/64

[28.17]

1/2 MALE NPT

MOUNTING

STUD

1/8 FEMALE NPT

LOW PRESSURE

CONNECTION

1/8 FEMALE NPT

HIGH PRESSURE

OPENING

4-3/8

[111.13]

3-1/16

[77.79]

1-5/8

[41.28]

4-1/16

[103.19]

2X Ø7/8

CONDUIT

OPENING

2-5/32 [54.76]

CLEARANCE FOR

COVER REMO

VAL

.875 [22.23] 2X

9/64 [3.57]

2-3/4

[69.86]

3-1/4

[82.55]

3/4

[19.05]

3-3/16 [80.98]

3X 2

[50.80]

2-5/16

[58.74]

A-389 mounting bracket

Note: Shown with included mounting bracket.

Bracket can rotate and be tightened at any angle.

FLOATING CONTACT NULL SWITCH FOR HIGH AND LOW ACTUATION

Visual Set Point Adjustment, Adjustable Null Zone

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

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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

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 —

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.

[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

[76.20] 1/2 CONDUIT

CONNECTION

SERIES 1640

SERIES 1831

SPECIFICATIONS

Service: Air and non-combustible,

compatible gases.

Wetted Materials: Consult factory.

Temperature Limits: -30 to 180°F

(-34to82.2°C).

Pressure Limits: 10psig(68.95kPa)

continuous,25psig(172.4kPa)surge.

Switch Type: 2 SPDT.

Actuation Time Difference: 1

millisecond maximum actuation delay

between contacts.

Repeatability: ±4% max.

Electrical Rating: 4A@125/250VAC.

Electrical Connections: Screw type

terminal block.

Process Connections: 1/8˝female

NPT.

Mounting Orientation: Diaphragm in

vertical position. Consult factory for other

position orientations.

Set Point Adjustment: Screw type

inside mounting spud.

Weight: 1lb2oz(522g).

• HVAC

MODEL CHART

Model Description Range (in w.c.)

1831-1-RA-S

1831-2-RA-S

Manual reset DPDT, activate on increase

2.5to9

7.5to23

ACCESSORIES

Model Description

A-302F-A

A-302F-B

A-302F-C

A-489

A-491

A-493

303SSstaticpressuretipwithmountingange;for3/16˝IDrubberor

plastictubing;4˝insertiondepth;includesmountingscrews

303SSstaticpressuretipwithmountingange;for3/16˝rubberor

plastictubing;6˝insertiondepth;includesmountingscrews

303SSstaticpressuretipwithmountingange;for3/16˝rubberor

plastictubing;8˝insertiondepth;includesmountingscrews

4˝straightstaticpressuretipwithange

6˝straightstaticpressuretipwithange

8˝straightstaticpressuretipwithange

MODEL CHART

Model

Ranges

in w.c.

Adjustable Null Span

Min. Set Point Max. Set Point

1640-0

1640-1

1640-2

.01 to 0.2

0.2 to 1.0

1.0 to 4.0

.01

.02

.03

.06

.12

YEAR LIMITED

WARRANTY

Dwyer 1831 Series User manual

Dwyer 1831 Series User manual

Dwyer 1831 Series User manual

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