Instrumentation Dresser Masoneilan Products
496 Series
Rotary Limit Switch

Model 78
Air Filter Regulator

Model BR200 / BR400
High Capacity Volume
Booster Relays

  • 10 amps @ 300 Volts A.C.
  • 0.6 amps @ 24/30 Volts D.C.
Inlet Pressure Rating:
  • 210 psi (15 bar) maximum Filter Element:
  • 5 μm sintered porous polyethylene
Maximum Supply Pressure:
  • 150 psi (10.3 bar)
Maximum Signal Pressure:
  • 150 psi (10.3 bar)
Position switches:
  • one or two electro-mechanical switches 
  • one or two inductive proximity switches
Pressure Set Range:
  • 78-4 Model:
    5-40 psi (0.35-2.8 bar)
  • 78-40 Model:
    5-100 psi (0.35-7 bar)
Ambient Temperature Range:
  • -30°C to +100°C (-22°F to +212°F)
  • optional:
    -55°C to +100°C (-43°F to +212°F)
Position transmitter:
  • opto-electronic position transmitter
Ambient Temperature Range:
  • -40°C to +83°C (-40°F to +182°F)
Input / Output Ratio:
  • 1:1
Hazardous Area Certifications:
  • ATEX, FM and CSA approvals
  • ¼" NPT or Rc
Maximum CV:
  • supply: 2.6
  • exhaust: 2.4
The 496 Series switches and position transmitters can be configured as electro-mechanical switches, proximity switches or opto-electronic position transmitters. These devices are designed with high resistance to vibration and electrical interference for reliable valve-mounted performance. Mechanical and electrical components are designed to operate in harsh environments and are approved for use with various hazardous area ratings including ATEX, FM and CSA. Dresser Masoneilan offers a variety of air filter regulating devices, including the Model 78 Air Filter Regulator for controlling the supply of process plant air to control valve accessories. These regulators are externally adjustable for fine tuning as required, but also include a locking feature to ensure output pressure remains at the desired level. The compact design allows for ease of mounting onto different equipment using different methods and orientations to fit the specific application. Dresser Masoneilan also offers the Model 77 Three-Way Transfer Valve for added flexibility in applying and tying together various pneumatic devices within a control valve loop. Model BR200 and BR400 pneumatic booster relays provide high capacity air volume boost for fast and reliable dynamic control valve system response. These devices provide a 1:1 input to output ratio with a maximum supply and signal pressure of 150 psi (10.3 bar). The BR200 and BR400 also include an integrated internal bypass valve for sensitivity adjustment and dynamic response optimization. These devices also have integrated filters in both the supply and signal ports and are designed using stainless steel components and corrosion resistant finishes for a robust and reliable assembly.
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