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Wiring

Set Point Adjustments

Loosen set screw located in switch body

immediately above label. Push wires into body

to increase differential pressure. Pull wires

away from body to decrease differential

pressure. Then tighten set screw. Entire

adjustable range may be covered by moving

wires approximately 3/16 inch each side of

mean.

Series A4 Differential Pressure Switch

Specifications – Operating Instructions

DWYER INSTRUMENTS, INC.

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

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361,U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

Lit-By Fax: 888/891-4963

BULLETIN A-A4

Rugged Series A4 Differential Pressure

Switch offers field adjustments and

can handle system pressures up to

6000 psig. Piston design allows

mounting in any orientation. The

switch is capable of carrying moderate

shock and vibratory loads.

SPECIFICATIONS

Service: Compatible gases.

Wetted Materials: Body, piston, and fittings:

anodized Aluminum;. spring: steel.

Temperature Limits: -65 to 225°F (-54 to

107°C).

Pressure Limits: 2000 psid (138 bar).

Repeatability: See table.

Switch Type: SPDT.

Electrical Rating: AC: 3 VA, 0.25A @ 120 VAC;

5 VA, 0.25A @ 175 VDC.

Electrical Connection: 24 AWG X 12 (30.5

cm) wire leads.

Process Connection: 1/4 female NPT.

Mounting Orientation: Any.

Set Point Adjustment: See table.

Weight: 8.5 oz (241 grams).

Agency Approvals: CE.

WHITE = common

BLUE = N.C.

BLACK = N.O.

HIGH PRESSURE POINT

LOW PRESSURE POINT

Maintenance/Repair

After final installation of the Series A4 Differential

Pressure Switch, no routine maintenance is

required. A periodic check of the system

calibration is recommended. These devices are

not field repairable and should be returned to

the factory if recalibration or other service is

required. After first obtaining a Returned Goods

Authorization (RGA) number, send the material,

freight prepaid, to the following address. Please

include a clear description of the problem plus

any application information available.

Dwyer Instruments

Attn: Repair Department

102 Highway 212

Michigan City, IN 46360

1/4 NPT

1.000 HEX

[25.40]

1-1/4

[31.75]

3-3/4

95.25]

1-1/2

[38.10]

A4 Bulletin 11/20/03 2:18 PM Page 1

Inhaltsverzeichnis

Seite 1 - Maintenance/Repair

WiringSet Point AdjustmentsLoosen set screw located in switch bodyimmediately above label. Push wires into bodyto increase differential pressure. Pull

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