Dwyer 1630 User Manual download pdf (Page 1)

Our highest precision conventional large diaphragm

pressure switch provides maximum dependability. In addi-

tion it incorporates a visible set point indicator for maximum

convenience. U.L. and C.S.A. listed, F.M. approved for gen-

eral service, these switches are suitable for most applica-

tions in air conditioning and industrial service. Electrical

capability of 15 amps handles most small electrical loads.

Environmental (MIL) Construction. Unlisted Model 1635

can be furnished with special snap switch and silicone rub-

ber diaphragm for high humidity and/or for government

applications. Similar to standard Model 1638 except dead

band is slightly greater. Specify Model No. 1635 (range No.)

MIL in ordering. Example: 1635-5-MIL.

HOUSINGS FOR USE WITH MODEL 1638 SWITCH

(also suitable for Models 1626, 1627 and 1640 switches)

PHYSICAL DATA

Temperature Limits: -30°F (-34.4°C) for dry air or gas to 110°F

(43.3°C). (Consult factory for higher temperature applications.)

Maximum Surge Pressure: 25 psig.

Rated Pressure: 10 psig.

Pressure Connections:

″ NPT(F).

Electrical Rating: 15 amps, 120-480 volts, 60 Hz. A.C.

Resistive

H.P. @ 125 volts, 1/4 H.P. @ 250 volts, 60 Hz. A.C.

Wiring Connections: 3 screw type, common, normally open

and normally closed.

Set Point Adjustment: Screw type with enclosed scale.

Housing: 16 ga. steel, zinc plated, dichromate dipped for 200

hour salt spray test.

Diaphragm: Silicone rubber.

Calibration Spring: Stainless steel.

Weight: 4 lbs., 14 oz. (2.21 kg).

Installation: Diaphragm vertical.

MODEL 1638:

Operating Ranges, Dead Bands and Ratings.

U.L. and C.S.A. Listed, F.M. Approved.

Suggested Specification

Differential pressure switches shall be diaphragm operated

to actuate a single pole double throw snap switch. Motion

of the diaphragm shall be restrained by a calibrated spring

that can be adjusted to set the exact pressure differential at

which the electrical switch will be actuated. Motion of the

diaphragm shall be transmitted to the switch button by

means of a direct mechanical linkage. Set point adjustment

shall be screw type with set point indicated on a visual

scale. Switches shall be Dwyer Instruments, Inc. Catalog

No. 1638-_____ for the required operating ranges.

Series 1630 – Differential Pressure Switch

Specifications – Installation and Operating Instructions

Bulletin E-52

Model

Number

1638-0

1638-1

1638-2

1638-5

1638-10

Operating

Range

Inches,

W.C.

0.05 to 0.25

0.20 to 1.0

1.0 to 3.0

2.0 to 6.0

3.0 to 12

At Min.

Set Point

0.04

0.06

0.07

0.11

Approximate

Dead Band

At Max.

Set Point

0.05

0.06

0.08

0.25

0.30

Explosion-proof Housing

Killark cast alum. housing No. 4GRH with dome for No. 1638 switches and No.

GRH with flat cover for No. 1626 and 1627 switches rated for Class I, Group D;

Class II, Groups E, F and G and Class III. Approximate weight, 47 lbs. Specify

“EXPL” in addition to switch catalog number.

DIAPHRAGM

1/2

[12.70]

TYP.

ADJUSTMENT

SCREW

[50.80]

TYP

[76.20]

6-1/2

[165.10]

1/8 NPT(F) LOW

PRESSURE CONNECTION

1/8 NPT(F) HIGH

PRESSURE CONNECTION

1/2

CONDUIT

CONNECTION

SPDT SNAP

SWITCH

SCREW TYPE

ELECTRICAL

TERMINALS

TYP 3 PLACES

8-3/16

[207.96]

Ø7-3/4

[196.85]

CONDUIT

ENCLOSURE

ADJUSTABLE

RANGE SPRING

Ø9/32 [7.14]

MOUNTING HOLE

TYP 4 PLACES

[76.20]

TYP

[101.60]

8-7/8

[225.43] SQ

9-3/4

[247.65] TYP

10-7/8

[276.23] TYP

1-1/4

[31.75]

7-1/8

[180.98]

3-7/8

[98.43]

1/2 NPT

ELECTRICAL

CONNECTION

1/8 NPT HIGH

PRESSURE

CONNECTION

1/8 NPT LOW

PRESSURE CONNECTION

1-5/16

[33.34]

[177.80]

TYP

13-5/8

[346.08]

TYP

[304.80]

TYP

[279.4]

10-3/4

[273.05]

TYP

[304.80]

3/4

[19.05]

TYP

1/8 NPT LOW

PRESSURE

CONNECTION

BREATHER

1/8 NPT HIGH

PRESSURE

CONNECTION

Ø3/8 [9.53]

MOUNTING HOLES TYPE 4 PLACES

11-3/4

[298.45]

3-1/2

[88.90]

3/4

[19.05]

TYP

[152.40]

2-1/8

[53.98]

3/4 NPT

ELECTRICAL

CONNECTION

Weatherproof Housing

16 ga. steel enclosure for

unusually wet or oily con-

ditions. Withstands 200

hour salt spray test.

Gasketed cover. Weight,

20 lbs. Switch must be

installed at factory.

Specify “WP” in addition

to switch catalog.

Model 1638 pressure switch -

U.L. and C.S.A. listed F.M. approved

DWYER INSTRUMENTS, INC.

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361 U.S.A.

Phone: 219/879-8000 www.dwyer-inst.com

Fax: 219/872-9057 e-mail: info@dwyer-inst.com

Lit-by-Fax: 888/891-4963

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DWYER INSTRUMENTS, INC 1

Summary of Contents

Page 1 - DWYER INSTRUMENTS, INC

Our highest precision conventional large diaphragmpressure switch provides maximum dependability. In addi-tion it incorporates a visible set point ind

Page 2

INSTALLATION1. Select a location free from excessive vibration where oilor water will not drip on the switch and where ambient tem-perature will be wi