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Type 1001 IP and EP Transducers from Marsh Bellofram are a patented family of electro-pneumatic instruments, used to reduce a supply pressure to a regulated output pressure which is directly proportional to a two-wire current or three-wire voltage input. 

This design incorporates closed loop sensing of the output pressure to achieve excellent accuracy and vibration stability. It also features a unique damping circuit which can be adjusted to prevent overshoot and actuator “hunting.” 

Model selection includes General Purpose (NEMA 1), Rainproof (NEMA 3R), and Watertight/Corrosion Resistant (NEMA 4X). NEMA 4X models are also explosion-proof and all models are intrinsically safe.
Features
  • 0.1% Accuracy Typical. 
  • Closed-loop Pressure Feedback Control Minimizes Effects of Vibration, Temperature, Supply Pressure and Mounting Angle. 
  • Built-in Volume Booster Provides Flows up to 12 SCFM. 
  • Easy Access Zero and Span Adjustment. 
  • Damping Pot Prevents Overshoot and “Hunting”. 
  • Low Air Consumption. 
  • Mounts at Any Angle (NEMA 3R Limited). 
  • Compact and Lightweight. 
  • Virtually No Sensitivity to Supply Pressure Changes. 
  • Removable Orifice for Easy Maintenance.

Specifications

Certifications & Approvals

  • CSA
  • FM
  • CE

Environmental Protection

  • NEMA 1
  • NEMA 3R
  • NEMA 4X

Accuracy

  • ± 0.1 % of output Span, typical
  • ± 0.25 % of output Span, Max. (Guaranteed)

Operating Temperature

  • BUna-N Elastomers: -20° to 160° F (-29° to 71° C)
  • Viton Elastomers: 0° to 160° F (-18° to 71° C)

Storage Temperature

  • Buna-N Elastomers: -40° to 200° F (-40° to 93° C)
  • Viton Elastomers: -15° to 200° F (-26° to 93° C)

Supply Pressure - Maximum

  • 100 psig (6.9 bar)

Port Size

  • Pneumatic: 1/4” NPT
  • Electrical: 1/2” NPT

  • Valve Actuators
  • Louver and Damper Actuators
  • Valve Positioners
  • Relays
  • Clutches and Brakes
  • Controllers
  • Air Cylinders

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