RP470A and B
Pneumatic Selector Relays
INSTALLATION INSTRUCTIONS
DESCRIPTION
RP470A and B are three-port relays with the following
differences:
RP470A:
•
Transmits the higher of two input signals.
•
Selects the higher pressure with a sensitivity of .015
psi (1.03 kPa).
•
Is used in sensor lines, such as LP914 or LP915
temperature sensors with a 1.25 to 2.50°F (0.68 to
1.3°C) accuracy, depending on sensor span.
•
Has a gray body.
RP470B:
•
Locks out one pressure signal when a second
pressure signal is higher.
•
Functions as a repeater for signal isolation.
•
Functions as a lower-of-two-pressures selector.
•
Has a gray and black body.
Fig. 1 shows RP4
7
0A and B dimensions in inches
(millimeters.)
3
2
1-1/2
(38)
(25)
C3211
Fig. 1. RP470A and B dimensions.
3
5
2
1
BEFORE INSTALLATION
In a lower-of-two-pressures application, the RP470B
requires a 0.007 Filter Restrictor 14002913-002 if the
input is not already restricted (a one-pipe device input.)
INSTALLATION
Mounting
Suspend on tubing or mount on a surface. See Fig. 2. for
surface mounting.
WALL OR
PANEL
RELAY
NO. 10 X 1/2 IN.
SHEET METAL SCREW
(OBTAIN LOCALLY)
MOUNTING CLIP
(PROVIDED)
C3214-1
Fig. 2. Typical surface mounting.
Piping
Fig. 3 shows adaptation piping. All connections are sharp
barb 5/32 in. (4 mm) O.D. polyethylene tubing.
CAUTION
To prevent damage to the sharp barb
connections, do not attempt to cut or pull the
tubing. To remove tubing from barb
connections, cut tubing a few inches from the
control device. Use a coupling to reconnect
tubing.
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95-7231EF
