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BIASING
RELAYS
- M14 - Positive & Negative
Bias Relay
View M14 Specs
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Designed for
applications that require an output pressure that is the sum
of a controlled input signal plus or minus a fixed bias,
Fairchild's Model 14 Biasing Pneumatic Relay provides
versatility in its ability to provide either positive or
negative biasing in a single unit. The output of the relay
is the sum of the spring bias, set with the Range Screw,
plus a pneumatic input signal. (Po = Ps
A
K); where Po is output pressure, Ps is signal pressure, and
K is the combined spring constant.
- M15 - Positive Bias Relay
View M15 Specs
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The Model 15
Positive Bias Relay is designed for applications that
require an output pressure that is the sum of a controlled
input signal plus a fixed bias. This pneumatic relay
provides an output pressure that represents the input signal
pressure plus a preset bias. Mathematically Po = Ps + K
where Po is output pressure, Ps is signal pressure and K is
the spring constant. The Fairchild Model 15 relay, available
in several bias range configurations to meet a variety of
output requirements, offers excellent sensitivity and high
flow capacity in a small volume.
- M85D - Multi-Stage
Positive Bias Relay
View M85D Specs
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The Fairchild
Model 85D Multi-Stage Biasing Relay is a precision control
combining the sensitivity of a precision pressure regulator
with positive biasing capability. This compact,
pilot-operated device offers unusually high output capacity
with minimal air consumption, while providing excellent
protection against supply or output pressure variations. The
basic mathematical expression for the Model 85D is PO = PS +
K where PO is output pressure, PS is signal pressure and K
is the spring constant.
- M1500A - High Flow
Positive Bias Relay
View M1500A Specs
- The Model
1500 Positive Bias Relay is designed for applications that
require an output pressure that is the sum of a controlled
input signal plus a fixed bias. This pneumatic relay
provides high output flow at an output pressure that
represents the input signal pressure plus a preset bias. The
output of the Fairchild Model 1500A relay is the sum of the
spring bias, set with the Range Screw, plus a pneumatic
input signal. (Po = Ps + K); where Po is output pressure, Ps
is signal pressure, and K is the spring constant set by the
Range Screw.
REVERSING RELAYS
- M25 - Reversing Relay
View M25 Specs
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The Model 25
Reversing Relay is designed for applications requiring an
output that equals a manually preset spring load minus a
variable signal pressure. This high quality unit combines
excellent sensitivity with unusually high flow capacity. The
basic mathematical expression for the Model 25 is PO = K -
PS where PO is output pressure, PS is signal pressure and K
is the spring constant
- M2500A - High Flow
Reversing Relay
View M2500A Specs
- The Model
2500A Bias Reversing Relay provides an outlet pressure that
decreases in direct proportion to increases in input signal.
The increasing input signal that acts on the Diaphragm
Assembly opposes the Range Spring force and closes the
Supply Valve to decrease output pressure, according to the
formula (Po = K - Ps); where Po is output pressure, K is the
spring constant, set by the screw, and Ps is signal
pressure. The M2500A pneumatic relay delivers this
performance at a flow capacity of 150 SCFM (255 m3/HR), to
provide fast response and tight control over your
application.
ADJUSTABLE RATIO RELAY
- M21 - Adjustable Ratio
Relay
View M21 Specs
- The Model 21
Adjustable Ratio pneumatic relay has a signal chamber lever
arm, whereby the ratio of output pressure to signal pressure
is infinitely adjustable. The adjustment range permits
signal amplification of 1:30 or signal reduction of 30:1 by
rotation of the ratio adjustment knob. The Model 21D is
available with both input and output adjustable bias.
Maximum input bias is 3 psig, with a maximum output bias of
9 psig. The basic mathematical expression for the bias in
this relay is Po = (Ps-K1) R+K2, where Po = Output pressure,
Ps = Input signal, R = Ratio of setting, K1= Input bias, (-)
only, and K2 = Output bias, (+) only.
PNEUMATIC COMPUTING
RELAY
- M22 - Computing Relay
View M22 Specs
- The Model 22
Pneumatic Computing Relay is a highly versatile control
valve designed to perform a number of specialized functions,
including averaging, differential, inverting, and
totalizing. This high quality unit, which offers up to four
inputs as well as positive and negative biasing over a broad
range, is available in several configurations to meet most
application requirements.
SNAP ACTING RELAY
- M24 - Snap Acting Relay
View M24 Specs
- The Model 24
Snap Acting Relay is a highly accurate differential relay
with snap-acting switching. The output of the unit will go
to supply pressure when the signal is equal to or greater
than the setpoint. The signal pressure must fall below the
set point to return the output to zero. This pneumatic
relay's Near Zero Throttling and Pilot Staging result in
true snap-action in your application.
SELECTOR RELAYS
- M90 - Lower Pressure
Selector Relay
View M90 Specs
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The Model 90 Low
Pressure Selector Relay is designed to select the lower of
two signal pressures to provide a continuous output pressure
to a control device. The Model 90 is recommended for dead
end or low flow service in critical applications such as
control loops requiring precise, automatic monitoring of
signal pressures.
- M91 - Higher Pressure
Selector Relay
View M91 Specs
- The Model 91
High Pressure Selector Relay is designed to select the
higher of two signal pressures, and to provide a continuous
output pressure (or pressure range) to a controller. The
ability to precisely control pressure switching and pressure
monitoring functions make the Model 91 the logical choice in
dead end or low flow applications such as precision control
loops.
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