Dwyer A9 User Manual

Series A9 Mini Pressure Switch

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Specifications - Installation and Operating Instructions

Bulletin IN-A9

Series A9 Pressure Switchesare designed for controlling

pressure with higher current capacity. These switches are used widely in steam cleaners, steam irons, and other pressure control systems. It provides SPDT contact and Series A9 Pressure Switches utilize high-quality miniature snap-action switches. The switch is diaphragm operated, boasting a high temperature rating and compact size.

INSTALLATION/MOUNTING

The switch can be mounted in any position. Do not twist the case when installing.

WIRING

All wiring must conform to the National Electrical Code and local regulations. Do not install the control to handle loads in excess of the electrical rating shown in the specifications. The terminals are labeled on the switch itself.

CAUTION: No lubrication or periodic servicing is required. Mount the control securely. Never exceed the electrical rating for the switch. Use the control only with compatible medias.

SPECIFICATIONS Service: Non-hazardous gas, liquid, or steam. Wetted Materials: Connection: Copper, Diaphragm:

Silicone or Stainless Steel (see model chart).

Temperature Limits: See model chart. Pressure Limit: See model chart. Repeatability: ±5%. Switch Type: SPDT. Electrical Ratings: 21A @ 125/250 VAC. Electrical Connections: 1/4˝ (6.35 mm) male quick

connect.

Process Connection: 1/8˝ male NPT. Weight: 2.6 oz (75 g). Deadband: See model chart.

MAINTENANCE

Upon final installation of the Series A9 Mini Pressure Switch, no routine maintenance is required. A periodic check of the system calibration is recommended. The Series A9 is not field serviceable and should be returned if repair is needed (field repair should not be attempted and may void warranty). Be sure to include a brief description of the problem plus any relevant application notes. Contact customer service to receive a return good authorization number before shipping.

Model Number

A9-1 A9-2 A9-3 A9-4 A9-5 A9-6

Range psig (bar)

2.9-8.7 (0.2-0.6)

7.3-17.4 (0.5-1.5)

14.5-36.3 (1.2-2.5)

21.8-58 (1.5-4.0) 29-87 (3.0-7.0) 58-130.5 (5.0-9.0)

MERCOID DIVISION

DWYER INSTRUMENTS, INC.

Deadband psig (bar)

2.9 ± 1.5 (0.2 ± 0.1)

3.6 ± 2.2 (0.25 ± 0.1)

5.1 ± 2.9 (0.35 ± 0.2)

8.7 ± 2.9 (0.6 ± 0.2)

Max Pressure psig (bar)

43.5 (3.0)

58.0 (4.0)

72.5 (5.0)

87.0 (6.0)

116.0 (8.0)

145.0 (10.0)

Phone: 219/879-8000 www.dwyer-inst.com Fax: 219/872-9057 e-mail: info@dwyer-inst.com

Temperature Limit

185˚F (85˚C) 257˚F (125˚C) 257˚F (125˚C) 257˚F (125˚C) 257˚F (125˚C) 257˚F (125˚C)

Diaphragm Material

Silicone Stainless Steel Stainless Steel Stainless Steel Stainless Steel Stainless Steel

P.O. BOX 258 • MICHIGAN CITY, INDIANA 46361 U.S.A.