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Positive and Negative Bias Relay (M14)

Features

  • Control sensitivity of 1/2" water column.
  • Balanced Supply Valve.
  • Aspirator Tube design.
  • Separate Control Chamber.
  • Mounting Bracket available
  • Canadian Registration Number (CRN) certification.

Benefits

  • Allows use in precision applications.
  • Minimizes the effects of supply pressure variation.
  • Minimizes downstream pressure droop under flow conditions.
  • Isolates the diaphragm from the main flow to eliminate hunting and buzzing.
  • Easy to install in the field
  • Certification for use in all Canadian territories and provinces.
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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 Model 14 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 combined spring constant.

Related products

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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. This unit, available in several bias range configurations to meet a variety of output requirements, offers excellent sensitivity and high flow capacity in a small volume. The Fairchild Model 15 Pneumatic Biasing Relay is well suited to a variety of control applications, including range shifting, and tension control, and pressure control from a remote location.
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  • High Flow Positive Bias Relay (M1500A)

     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 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.
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  • Multi-Stage Positive Bias Relay (M85D)

     The 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 versatile Model 85D is recommended for use in systems requiring precision pressure maintenance and instrument biasing, in dead end service and instrument panel supply applications. The basic mathematical expression for the Fairchild Model 85D is PO = PS + K where PO is output pressure, PS is signal pressure and K is the spring constant.
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Specifications
Max Supply Pressure:
250 psig [17 BAR]
Max Output Pressure:
100 psig [7 BAR]
Flow Capacity:
40 SCFM (68 m3/HR)
Accuracy:
0.3 psi (typ)

Downloads
M14 Positive and Negative Bias Relay M14 Specs
M14 Positive and Negative Bias Relay M14 IOM Sheets

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