R-2080 1:1 Booster Relay Product Reference Guide

Текст документа

Pneumatic Control Manual 717.1
                                                           Comparators, Cumulators, and Relays Section
                                                                                     Reference Bulletin # 1
                                                                                           Issue Date 0677

                                           R-2080
                                      1:1 Booster Relay

The R-2080 operates as a 1:1
pneumatic repeater and volume
amplifier. The signal received at
the R-2080 pilot is repeated at
its output at a 1:1 ratio. The
pilot signal may be from a non-
relay (low volume) controller
which is amplified to a high
volume output signal to either
improve the response time of a
controlled device or for
operation of additional
controlled devices. Low volume
(restrictor type) devices in
control circuits reduce air flow to                          R-2080 1:1 Booster Relay
the controlled devices to                                      (Shown Actual Size)
45 SCIM (12.28 mL/s) or less.
                                      position to close off supply           pressure and the diaphragm will
To assure a good response
                                      pressure to the R-2080. A high         retract from the exhaust orifice
time, the R-2080 should be
                                      degree of accuracy is achieved in      seat allowing air to escape from
installed as the final item in a
                                      attaining a 1:1 ratio because pilot    the output chamber. When the
control circuit ahead of the
                                      and output air pressures are           pilot and output air chambers
controlled device.
                                      acting on a single diaphragm           are again equal in pressure, the
The R-2080 develops an                from chambers of equal                 diaphragm will return to a
accurate, direct acting 1:1           diameter. The small amount of          position to seat against the
relationship between pilot and        air leakage [maximum of                exhaust orifice. Note: The
output pressure over its              10 SCIM (2.73 mL/s)] around the        R-2080 can be used with leak
operating range. The offset,          ball valve will escape through the     type devices, however,
nonlinearity, and hysteresis are      exhaust orifice.                       deviation of the output
all minimal, enabling the R-2080                                             pressure from the pilot
                                      On a decease in pilot pressure,
to be used in many applications                                              pressure may then exceed
                                      output chamber pressure will
including pneumatic                                                          the 0.1 PSI (0.7 kPa)
                                      overcome pilot chamber
transmission systems.                                                        maximum deviation achieved
                                                                             with dead ended devices.
Operation
Pilot pressure to the R-2080
dead ends at a diaphragm. The
diaphragm, through a plunger,
exerts a force against a spring
loaded ball valve in the supply
chamber to allow the entry of
supply air to the output chamber.
A port in the output chamber
allows the escape of large
volume of output air to a dead
ended controlled device until the
pressure in the output lines,
controlled device power chamber
and the R-2080 output chamber
increases to the same pressure
as that of the pilot chamber.
When equilibrium is reached in
the two chambers, the spring will
return the ball valve to the closed

© 1977 Johnson Controls, Inc.                                                                                 1
  Code No. LIT-7171490X
Controls Group
507 E. Michigan Street
P.O. Box 423                    Printed in U.S.A.
Milwaukee, WI 53202

2   R-2080 Reference Bulletin

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• R-2080-1 — Реле-усилитель (бустер)

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