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Technical Instructions

Document No. 155-040P25

RL 243-4

April 1, 2005

RL 243 SW Switching Relay

Siemens Industry, Inc.

Description

The Powers 243 SW Switching Relay is a two-position, pilot-operated auxiliary device

used for switching a common part from one pneumatic circuit to another.

A mounting bracket is provided for mounting on a vertical or horizontal surface.

Product Number

243-0001

Warning/Caution Notations

WARNING

Personal injury/loss of life may occur if you do not

perform a procedure as specified.

CAUTION

Equipment damage, or loss of data may occur if you do

not perform a procedure as specified.

Specifications

Operating

Maximum Instrument Air Supply 30 psi (207 kPa)

Changeover Range 3 to 25 psi (21 to 172 kPa)

Standard Changeover Setting 9 psi (62 kPa)

Changeover Differential (Nominal) 1.5 psi (10.3 kPa)

Maximum Ambient Temperature 160°F (71.1°C)

Minimum Ambient Temperature -20°F (-28.8°C)

Air Connection 1/8-inch NPT

Shipping Weight 2 Ib (.9 kg)

Nominal Capacity @ 2 psi ∆ P

A Port 800 scim

B Port 1100 scim

Typical Specifications

Provide a pneumatic switching relay to deliver, stop or divert instrument air from one

pneumatic circuit to another. Relay to be of non-bleed, force-balance type operation with

adjustable changeover (switching) point.

Summary of content (5 pages)

PAGE 1
Technical Instructions Document No. 155-040P25 RL 243-4 April 1, 2005 PowersTM Controls RL 243 SW Switching Relay Description The Powers 243 SW Switching Relay is a two-position, pilot-operated auxiliary device used for switching a common part from one pneumatic circuit to another. A mounting bracket is provided for mounting on a vertical or horizontal surface.
PAGE 2
Technical Instructions Document Number 155-040P25 April 1, 2005 Operation RL243 SW Switching Relay With an increase in air pressure at Port C, the diaphragm in Chamber E is forced upward to overcome the adjustment spring setting. As the diaphragm moves upward, the return spring moves the floating piston upward to unseat the small ball valve and seat the large ball valve. Ports A and D are now connected and Port B is closed.
PAGE 3
RL 243 SW Switching Relay Direct Acting, Low Capacity, Low Differential Switching Relay Technical Instructions Document Number 155-040P25 April 1, 2005 An increasing input (“C” port) signal switches the output (“D” port) signal from approximately zero to supply air pressure. In a typical application, a pump through a PE switch is started or stopped by the switching relay in response to a signal from a temperature transmitter.
PAGE 4
Technical Instructions Document Number 155-040P25 April 1, 2005 High Capacity, Low Differential Switching Relay RL243 SW Switching Relay To provide high capacity at low differential, one switching relay must be used to pilot a second switching relay. The transmitter input (“C” port) to the first switching relay switches it. The output (“D” port) on the first relay is the input (“C” port) to the second switching relay, therefore both switch at approximately the same time.
PAGE 5
RL 243 SW Switching Relay Maintenance Technical Instructions Document Number 155-040P25 April 1, 2005 If inoperable replace entire unit. Dimensions Figure 6. Dimensions in Inches (Millimeters). Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Powers is a registered trademark of Siemens Industry, Inc.