TAC Pneumatic Products Catalog

R503 Series (2353-5xx Series)
TAC PNEUMODULAR � Diverting Relays
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.
Features:
• 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.
Model Chart
Model No. Wholesale
Model No.
Type Differential
psi (kPa)
R503-1 2353-501a 0.2 to 0.6
(1.4 to 2.8)
R503-2 2353-502
SPDT
a 2 to 4
(14 to 28)
R503-3 2353-503 a 0.2 to 0.6
(1.4 to 2.8)
Setpoint Range
psig (kPa)
3 b to 20
(21 to 138)
a Includes two plastic mounting straps and adhesive backed mounting plastic.
b DO NOT SET below this value.
4.5 b to 20
(31 to 138)
None
adjustable
Switching Action
M NC NO C S
R503-1, R503-2
Shown
Port S at setpoint minus diff.: ports NO and C are connected.
Port S at setpoint: ports NC and C are connected.
Port 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.
Dimensions
in. (mm) H x W x D
4-1/8 x 1-31/32 x 3-9/64
(105 x 50 x 80)
4-1/2 x 1-31/32 x 2-55/64
(114 x 50 x 73)
4-1/8 x 1-31/32 x 3-9/64
(105 x 50 x 80)
90 © Copyright 2006 TAC. All Rights Reserved. F-27383-1
R503
Series
(2353-5xx
Series)