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Model 15 Positive Bias Relay
Brand: Fairchild Industrial Products
The Rotork Fairchild 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.
Features- Sensitive to 1/4" Water Column variation
- Balanced Supply Valve
- Aspirator Tube
- Flow Capacity of 40 SCFM (68 m3/Hr)
- Separate Control Chamber
- Mounting Bracket available
- Permits use in high precision applications
- Minimizes the effects of supply pressure variation
- Minimizes downstream pressure droop under flow conditions
- Allows use in applications requiring high flow and/or fast response
- Isolates the diaphragm from the main flow, eliminating hunting and buzzing
- Quick and easy field installation
Specifications
Ambient Temperature Range
- -40° to 93° C (-40° to 200° F)
Enclosure, Body Material
- Aluminum Alloy
Exhaust Capacity - Relieving Units Only
- 40 scfm (68 m³/hour)
Flow Capacity
- 150 scfm (255 m³/hour)
Mounting
- Pipe or Panel
Pressure Range
- bar: 0 to 0.7
- bar: 0.03 to 2
- bar: 0.1 to 4
- bar: 0.15 to 10
- kPa: 0 to 70
- kPa: 10 to 400
- kPa: 15 to 1,000
- kPa: 3 to 200
- psi: 0.5 to 30
- psig: 1 to 60
- psig: 2 to 150
Sensitivity
- < 1/4” WC (0.64 cm)
Signal or Output Pressure - Maximum
- bar: 10
- kPa: 1,000
- psig: 150
Supply Pressure - Maximum
- bar: 17
- kPa: 1,700
- psig: 250
Supply Pressure Effect
- psig: 0.1 (bar: 0.007, kPa: 0.7) for a psig: 100 (bar: 7, kPa: 700) Change in Supply Pressure
