Positive and Negative Bias Relays are 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 line up of biasing pneumatic relay products includes both positive biasing relays, such as the Models 15, 85D and 1500A and relays that handle both positive and negative biasing functions such as the Model 14.

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.

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.