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Schneider Electric R503 Series (2353-5xx Series) TAC Pneumodular® Diverting Relays

TAC Pneumodular® Diverting Relays
R503 Series (2353-5xx Series)

The R503-1 and R503-2 diverting relays are snap-acting devices with adjustable setpoints. They are designed for a variety of switching and interlocking functions in pneumatic control systems where the application requires one or more of the following functions: feeding and exhausting branch lines, diverting a supply line to either one of two branch lines, or diverting one of two supply lines to one branch line. The primary function of these devices is to convert a proportional pneumatic signal, at a predetermined setting, into a positive pneumatic switching action.

The R-503-3 is a non-adjustable, snap-acting, signal-comparing diverting relay designed for use in pneumatic control systems where the application requires a pneumatic switching function based on the comparison of two proportional pneumatic input signals.

• All R503 Series Relays provide positive two-position snap-action, provide SPDT pneumatic switching. Require main air supply.
• R503-1 and R503-2 have setpoint dial with PSIG markings.
• R503-1 has narrow differential; to be piloted by transmitter signals.
• R503-2 has wide differential; to be piloted by controller signals.
• R503-3 compares two (usually transmitter) signals; provides narrow differential switching based on the signal comparison.
• All ports clearly labeled. Ports align with MCS-S terminals.
• TAC PNEUMODULAR: Mounts on MCS-Socket or K503 Mounting Bracket.

Select a link under the "item" tab below to order.

Cat #Switching Action
R503-1Port S at setpoint minus diff.: ports NO and C are connected. Port S at setpoint: ports NC and C are connected.
R503-2Port S at setpoint minus diff.: ports NO and C are connected. Port S at setpoint: ports NC and C are connected.
R503-3Port S2 is approx. 0.3 psi (2.1 kPa) greater than port S: ports C and NO are connected. Port S greater than or equal to that at Port S2: ports C and NC are connected.
Control action: Refer to Model Chart.
Construction: Glass-filled nylon.
Glass-filled nylon: 140°F (60°C).
Supply air pressure: Clean, dry, oil free air required.
Nominal: 15 to 25 psig (103 to 172 kPa).
Maximum: 30 psig (207 kPa).
Connections: Barbed nipples for 1/4 in. O.D. polyethylene tubing.
Air consumption: 29 scim(7.9 mL/s).
Air flow capacity: 60 scfh (1.7 scmh).
Adjustments: Knob operates over two revolutions. A moving pointer slide is provided to indicate both inner and outer scales.
Mounting: Designed for use on MCS-S manifold socket. These devices can also be surface mounted by using the K503 mounting bracket.
Dimensions: Refer to Model Chart.


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