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

Models matching criteria: 434
  • Base Model - 1542
  • Port Size - 1/2" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Straight
100+ In Stock
$1,176.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 3/8" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,407.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 1/4" NPT
  • Port Thread - NPT
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,505.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 3/8" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Straight
100+ In Stock
$1,628.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 1/2" NPT
  • Port Thread - NPT
  • Elastomers - Fluorocarbon (Viton)
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,700.00 CAD
$10.00 Shipping
  • Base Model - 1544
  • Port Size - 1/2" NPT
  • Port Thread - NPT
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,598.00 CAD
$10.00 Shipping
  • Base Model - 1544
  • Port Size - 1/2" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Straight
100+ In Stock
$2,315.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 3/8" NPT
  • Port Thread - NPT
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Straight
100+ In Stock
$2,458.00 CAD
$10.00 Shipping
  • Base Model - 1543
  • Port Size - 1/2" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Fluorocarbon (Viton)
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,094.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 1/2" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Fluorocarbon (Viton)
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Straight
100+ In Stock
$1,872.00 CAD
$10.00 Shipping
  • Base Model - 1546
  • Port Size - 1/2" NPT
  • Port Thread - NPT
  • Elastomers - Fluorocarbon (Viton)
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$2,372.00 CAD
$10.00 Shipping
  • Base Model - 1543
  • Port Size - 3/8" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Fluorocarbon (Viton)
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Straight
100+ In Stock
$1,158.00 CAD
$10.00 Shipping
  • Base Model - 1546
  • Port Size - 1/2" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Straight
100+ In Stock
$666.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 3/8" NPT
  • Port Thread - NPT
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$2,288.00 CAD
$10.00 Shipping
  • Base Model - 1544
  • Port Size - 3/8" NPT
  • Port Thread - NPT
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$2,397.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 1/4" NPT
  • Port Thread - NPT
  • Elastomers - Fluorocarbon (Viton)
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$2,558.00 CAD
$10.00 Shipping
  • Base Model - 1546
  • Port Size - 3/8" NPT
  • Port Thread - NPT
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,148.00 CAD
$10.00 Shipping
  • Base Model - 1546
  • Port Size - 1/2" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Straight
100+ In Stock
$517.00 CAD
$10.00 Shipping
  • Base Model - 1543
  • Port Size - 3/8" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Straight
100+ In Stock
$677.00 CAD
$10.00 Shipping
  • Base Model - 1546
  • Port Size - 1/4" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Straight
100+ In Stock
$858.00 CAD
$10.00 Shipping
  • Base Model - 1543
  • Port Size - 1/2" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Straight
100+ In Stock
$91.00 CAD
$10.00 Shipping
  • Base Model - 1544
  • Port Size - 3/8" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Fluorocarbon (Viton)
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Straight
100+ In Stock
$239.00 CAD
$10.00 Shipping
  • Base Model - 1544
  • Port Size - 3/8" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$891.00 CAD
$10.00 Shipping
  • Base Model - 1544
  • Port Size - 3/8" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Straight
100+ In Stock
$1,264.00 CAD
$10.00 Shipping
  • Base Model - 1544
  • Port Size - 3/8" NPT
  • Port Thread - NPT
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Straight
100+ In Stock
$1,933.00 CAD
$10.00 Shipping
  • Base Model - 1544
  • Port Size - 1/4" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$415.00 CAD
$10.00 Shipping
  • Base Model - 1546
  • Port Size - 3/8" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Fluorocarbon (Viton)
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,815.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 1/2" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Fluorocarbon (Viton)
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Straight
100+ In Stock
$2,224.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 1/4" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$2,525.00 CAD
$10.00 Shipping
  • Base Model - 1546
  • Port Size - 1/4" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$396.00 CAD
$10.00 Shipping
  • Base Model - 1544
  • Port Size - 1/2" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,155.00 CAD
$10.00 Shipping
  • Base Model - 1546
  • Port Size - 1/2" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,750.00 CAD
$10.00 Shipping
  • Base Model - 1543
  • Port Size - 1/2" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,754.00 CAD
$10.00 Shipping
  • Base Model - 1543
  • Port Size - 1/4" NPT
  • Port Thread - NPT
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$447.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 1/4" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Straight
100+ In Stock
$1,652.00 CAD
$10.00 Shipping
  • Base Model - 1546
  • Port Size - 1/4" NPT
  • Port Thread - NPT
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,418.00 CAD
$10.00 Shipping
  • Base Model - 1543
  • Port Size - 1/4" NPT
  • Port Thread - BSPP (Parallel)
  • Elastomers - Silicone
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,022.00 CAD
$10.00 Shipping
  • Base Model - 1546
  • Port Size - 1/4" NPT
  • Port Thread - BSPT (Tapered)
  • Elastomers - Fluorocarbon (Viton)
  • Actuation Adjustment Means - Knob Adjustment
  • Exhaust Port - Straight
100+ In Stock
$1,007.00 CAD
$10.00 Shipping
  • Base Model - 1542
  • Port Size - 1/2" NPT
  • Port Thread - NPT
  • Elastomers - Silicone
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$208.00 CAD
$10.00 Shipping
FAIRCHILD Model 15 Positive Bias Relay, 1/4", 1-60, Tapped Exhaust, Tamper-Proof view more
  • Base Model - 1544
  • Port Size - 1/4" NPT
  • Port Thread - NPT
  • Elastomers - Buna-A & Dacron
  • Actuation Adjustment Means - Tamper Proof
  • Exhaust Port - Tapped Exhaust
100+ In Stock
$1,796.00 CAD
$10.00 Shipping

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

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