Model T7500 Low Pressure Electro-Pneumatic Transducers from Rotork Fairchild

Rotork Fairchild Model T7500 Low Pressure Electro-Pneumatic TransducerThe T7500 series low-pressure transducer converts a DC electronic input signal to a proportional low-pressure pneumatic output. The transducer employs electronic closed-loop feedback in conjunction with a piezoceramic actuator flapper nozzle system in the pilot stage to control the signal pressure of an integral pneumatic volume booster.

Rotork Fairchild’s T7500 series I/P Transducer delivers the highest setpoint accuracy at low output pressure ranges of 0-2.5, 0-5, 0-7.5, and 0-15 psig. Output pressure ranges can be ranged down to as low as 0-1 psig.

Using proprietary pneumatic and electronic design, the T7500 accepts supply pressures from 20-30 psig (1.5-2 bar) and mA or VDC control signals to proportionally control the output pressure in very low ranges. While most transducers struggle to accurately and repeatedly hold a low-pressure output setpoint, the T7500 will provide 0.25% or better accuracy at pressure ranges as low as 0-1 psig (0-69 mbar) output.

The T7500 is available in a variety of configurations for electrical connection and can be mounted with its standard supplied bracket or DIN rail mounted.

Features

Model T7500 Low Pressure Electro-Pneumatic Transducer Features

  • The volume booster employs a highly sensitive control diaphragm and main valve to accurately control the flow of air to the downstream system in response to the pressure received from the pilot stage. The electronic closed-loop feedback senses the output pressure of the volume booster directly to affect the ultimate in accurate pressure control.
  • 4 available output ranges - tremendous versatility for application design.
  • Accuracy as low as 0.15% - high precision, reliable operation.
  • Field reversible feature provides an output inversely proportional to the input signal.
  • RFI/EMI protection eliminates susceptibility to electromagnetic and radio interference.
  • Internal electronic feedback and a piezoelectric actuator provide precise control of output pressure regardless of vibration or position.
  • Damping adjustment allows for optimum tuning response.
  • Split range operation allows a common signal source to control two or more functions.
  • NEMA 4X, type 4 enclosure and IP65 rated - Suitable for indoor and outdoor installations.
  • Compact size for use in restricted spaces.
  • Accepts 20-30 psig (1.5-2 bar) supply.
  • Controls output pressure ranges as low as: 0-1 psig (69 mbar).

Specifications

Model T7500 Low Pressure Electro-Pneumatic Transducer Specifications

  • Supply Pressure: 20-30 psig (1.5-2.0 bar)
  • Accuracy (ISA S51.1)
    • 0.25% Full scale guaranteed
    • 0.10% Full scale typical
  • Flow Rate (SCFM)
    • T7501: 3.0 (5.1 m3/hr) @ 30 psig (2 bar) supply 5 psig (0.3 bar) output
    • T7502: 7.0 (11.9 m3/hr) @ 30 psig (2 bar) supply 5 psig (0.3 bar) output
  • Supply Voltages: Three-wire voltage input: 7.2 to 30 VDC, <3 mA
  • Control Signals
    • 4-20 mA 2-wire
    • 0-5 VDC 3-wire
    • 0-10 VDC 3-wire
  • Materials of Construction
    • Body and Housing: Chromate-treated Aluminum
    • Orifice: Nickel-plated Brass & Sapphire
    • Trim:    Stainless steel, Brass & Zinc-plated Steel
    • Elastomers:    Nitrile
    • Finish:    Epoxy powder coating

Dimensions

Model T7500 Low Pressure Electro-Pneumatic Transducer Dimensions

TD7500 Dimensions

Rotork Fairchild Model TD7500 Low Pressure Electro-Pneumatic Transducer Dimensions

TT7500 Dimensions

Rotork Fairchild Model TT7500 Low Pressure Electro-Pneumatic Transducer Dimensions

TA7500 Dimensions

Rotork Fairchild Model TA7500 Low Pressure Electro-Pneumatic Transducer Dimensions

Q & A

Q&A Section with Expand/Collapse Icons

Model T7500 Low Pressure Electro-Pneumatic Transducer Q & A

+ What input signals and supply pressure does the T7500 support?
The T7500 accepts common industrial electronic control signals such as 4–20 mA DC, 0–5 VDC, or 0–10 VDC. It requires a supply (instrument air) pressure of roughly 20–30 psig (≈1.4–2.0 bar). This flexibility in signal input and moderate air supply makes it compatible with standard control systems and pneumatic instrumentation loops — a big plus when integrating into existing manufacturing, process-control, or lab setups.
 
+ What output pressure ranges and accuracy can I expect?
The T7500 supports low pneumatic output ranges — typical outputs include 0–30 psig (or lower, depending on variant). It’s engineered for high precision: accuracy can be as good as 0.15% of full scale under typical conditions, with hysteresis and repeatability around 0.1% FS. This makes T7500 well-suited for applications demanding very stable, precise low-pressure control (e.g., leak testing, instrumentation, or low-flow pneumatic control).
+ Is the T7500 reliable under vibration, different mounting orientations, or harsh environments?
Yes. The T7500 uses a piezo-ceramic actuator with internal electronic feedback and a flapper-nozzle pilot stage, designed to maintain precise pressure control regardless of vibration or mounting orientation. Additionally, it comes in a NEMA 4X / IP65-rated enclosure, meaning it’s suitable for both indoor and outdoor installations, and can resist dust, moisture, and moderate environmental stress. That robustness helps ensure long-term stability and reliability, especially in industrial or field conditions where environmental factors can cause wear or signal drift.
 
+ How flexible is the T7500 for different applications or control configurations?
The T7500 offers considerable versatility: multiple output ranges, a field-reversible feature (output can be made inversely proportional to input), and split-range operation (enabling one control signal to manage two or more functions). Also, it supports variable mounting and electrical connection options — making it easier to integrate into diverse systems. This flexibility is attractive to users needing adaptable equipment: from test benches to process control, lab instrumentation, or small-scale pneumatic automation.  
 
 
+ What are the maintenance considerations and long-term performance expectations (air consumption, wear, recalibration)?
According to the manufacturer’s datasheet, the T7500’s internal design — including the solid-state piezo actuator, feedback loop, and rugged aluminum housing — ensures stable long-term operation, even under vibration or frequent cycling. Because it uses standard instrument air at moderate pressure and has an efficient volume-booster design, air consumption is manageable, and performance under supply-pressure variations remains stable. In practice, this means lower maintenance overhead and reliable performance over time — important for industrial, lab, or continuous-use environments.
 


 

Downloads

Download Rotork Fairchild Model T7500 Compact E/P, I/P Low Pressure Transducer Datasheet

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