Fairchild Pneumatic Positive Bias Relay, Model 15
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Model 15 Positive Bias Relay

Brand: Fairchild Industrial Products

Fairchild Pneumatic Positive Bias Relay, Model 15 Fairchild Pneumatic Positive Bias Relay, Model 15 Fairchild Pneumatic Positive Bias Relay, Model 15 Fairchild Pneumatic Positive Bias Relay, Model 15 Fairchild Pneumatic Positive Bias Relay, Model 15
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

Brand

Pressure Range

  • 0-10 psig : 0-0.7 bar : 0-70 kPa
  • 0.5-30 psig : 0.03-2 bar : 3-200 kPa
  • 1-60 psig : 0.1-4 bar : 10-400 kPa
  • 2-150 psig : 0.1-10 bar : 15-1000 kPa

Pipe/Port Size

  • 1/4"
  • 3/8"
  • 1/2"

Pipe/Port Thread Type

  • NPT
  • BSPP
  • BSPT

Approvals & Certifications

  • CRN

Hazardous Areas

  • Acceptable in Zones 1–2 (gas, Groups IIA & IIB) and Zones 21–22 (dust).

Max. Supply Pressure

  • 250 psig : 17.0 bar : 1700 kPa

Max. Output Pressure

  • 150 psig : 10.0 bar : 1000 kPa

Flow Capacity

  • 40 scfm (68 m³/hr) @ 100 psig, 7.0 bar, 700 kPa supply & 20 psig, 1.5 bar, (150 kPa) setpoint.

Supply Pressure Effect

  • Less than 0.1 psig : 0.007 bar : 0.7 kPa for a 100 psig : 7.0 bar : 700 kPa change in supply pressure.

Exhaust Capacity

  • 5.5 scfm (9.35 m³/hr) where downstream pressure 5 psig : 0.35 bar : 35 kPa above setpoint of 20 psig :1.5 bar : 150 kPa.

Sensitivity

  • Less than 1/4” (.64 cm) W.C.

Ambient Temperature Limits

  • -40° F to +200° F (-40° C to 93.3° C)

Tapped Exhaust Vent

  • Tapped

Tamper Proof

  • Tamper Proof

Body & Housing Material

  • Aluminum

Elastomers Material

  • Silicone
  • Viton (Fluorocarbon)

Diaphragm Material

  • Buna-A on Dacron

Trim Material

  • Brass, Stainless Steel, Zinc-Plated Steel

Mounting Style

  • Line/Pipe Mount
  • Panel Mount

Sensitivity

  • < 1/4 inH₂O (0.64 cm)

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

Signal or Output Pressure - Maximum

  • bar: 10
  • kPa: 1,000
  • psig: 150

Supply Pressure Effect

  • psig: 0.1 (bar: 0.007, kPa: 0.7) for a psig: 100 (bar: 7, kPa: 700) Change in Supply Pressure

Mounting

  • Pipe or Panel

Flow Capacity

  • 150 scfm (255 m³/hour)

Enclosure, Body Material

  • Aluminum Alloy

Exhaust Capacity - Relieving Units Only

  • 40 scfm (68 m³/hour)

Ambient Temperature Range

  • -40° to 93° C (-40° to 200° F)

Supply Pressure - Maximum

  • bar: 17
  • kPa: 1,700
  • psig: 250

Documentation

Data Sheets

Product Manuals

Certifications & Approvals

Installation Instructions

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