Type 650 Positive Bias Relay

Brand: ControlAir

The Type 650 positive bias relay is a signal operated regulator that provides an output pressure that is the sum of the input signal pressure plus a preset bias.

The unit allows flow capacities up to 50 SCFM with minimal pressure drop. An aspirator tube at the output maintains the set pressure under varying flow conditions by causing the main supply valve to open and close proportionally to the flow demand.

There is a choice of four adjustment ranges for the positive bias settings. This unit is most often used for conversion of a low flow control signal to the higher flow requirements of an operating system.
Features
  • High Flow Capacity
    • Allows flows up to 50 SCFM 
  • Four Bias Ranges
    • From 0-15 psi to 2-150 psi 
  • High Relief Capacity
    • Large relief valve provides 15 SCFM relief capacity 
  • Balanced Supply Valve
    • Rolling diaphragm design makes unit insensitive to supply pressure variation 
  • Accurate Pressure Conversion
    • High sensitivity achieves accurate conversion of signal to output with no lag 
    • Maximum Signal Pressure: 150 psig, 10 bar, 1034 kPa 
    • Maximum Supply Pressure: 250 psig, 17 bar, 1750 kPa 
    • Ambient Temperature: -40° to 71°C (-40° to 160°F) 
    • Port Size: 1/4", 3/8" 
    • Port Threads: NPT 
    • Material of Construction:
      • Body: Diecast Aluminum 
      • Elastomers: Nitrile and Polyester 
      • Knob: ABS Plastic

Specifications

Brand

Actuator Type

  • Knob Adjust
  • Tamper-Proof

Ambient Temperature Range

  • -40° to 71° C (-40° to 160° F)

Diaphragm Material

  • Nitrile & Polyester Fabric

Enclosure, Body Material

  • Die Cast Aluminum

Exhaust Capacity - Relieving Units Only

  • 15 scfm (25.5 m³/hour) where Downstream Pressure is psig: 5 (bar: 0.35, kPa: 35) Above Set Pressure

Flow Capacity

  • 50 scfm (76.5 M 3/Hour) at psig: 100 (bar: 7, kPa: 700) Supply with psig: 20 (bar: 1.4, kPa: 140) Output

Mounting

  • Bracket
  • Panel
  • Pipe

NPT Connection

  • 1/4" NPT Female
  • 3/8" NPT Female

Pressure Range

  • bar: 0 to 10
  • kPa: 0 to 1,000
  • psig: 0 to 150

Sensitivity

  • less than 1/4" WC (3.2 mm)

Signal or Output Pressure - Maximum

  • bar: 10
  • kPa: 1,034
  • psig: 150

Supply Pressure - Maximum

  • bar: 17
  • kPa: 1,750
  • psig: 250

Supply Pressure Effect

  • 0.1 psig for a 50 psig Change

Vent

  • Straight
  • Tapped Exhaust

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