Model T7800 Electro-Pneumatic Transducer from Rotork Fairchild

Model T7800 Electro-Pneumatic Transducer from Rotork FairchildHigh performance at economical process is available from the Rotork Fairchild T7800 series of piezo-ceramic actuated I/P transducer. These units offer state-of-the-art accuracy up to 0.15% FS. The disc actuation mechanism provides a product that is totally impervious to shock, vibration, and positional orientation.

Operating Principles

Standard Range

The Model T7800 Series converts a DC input signal to a linear proportional pneumatic output. It includes the Primary Converting Section and the pneumatic Relay Section. The Piezoelectric Ceramic Actuator, in the Primary Converting Section, functions as a Flapper. The Flapper and Nozzle work together to control the signal pressure. The signal pressure that sets the output pressure acts on the Upper Control Diaphragm in the Pneumatic Relay Section. The Lower Control Diaphragm in the Pneumatic Relay Section senses the output pressure.

Extended Range

In the Extended Range units, an additional Relay Section amplifies the output pressure.

Features

Model T7800 Electro-Pneumatic Transducer Features

  • In the extended range units, an additional relay section amplifies the output pressure to obtain up to 0-120 psi [0-8.0 BAR], (0-800 kPa) output.
  • 18 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 provides 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.
  • FM, CSA, ATE,X and IECEx approvals.
  • Carries global approval for intrinsic safety and hazardous location operation.

Specifications

Model T7800 Electro-Pneumatic Transducer Specifications

Rotork Fairchild Model T7800 Electro-Pneumatic Transducer Standard Range Specifications

 

Dimensions

Model T7800 Electro-Pneumatic Transducer Dimensions

Rotork Fairchild Model T7800 Electro-Pneumatic Transducer Standard Range Dimensions

 

Model TA7800 Standard Range Dimensions shown.

Q & A

Q&A Section with Expand/Collapse Icons

Rotork Fairchild Model T7800 Electro-Pneumatic Transducer Q & A

+ What output pressure ranges does the T7800 support, and how flexible are the configurations?
The T7800 offers up to 18 different output ranges, giving it exceptional versatility for a wide range of industrial and process-control applications. Depending on the variant, output pressure can reach as high as 0–120 psi (0–8.0 bar / 0–800 kPa) in extended-range models. This flexibility makes the T7800 suitable whether you need low-pressure control or more demanding pneumatic outputs, and supports different process requirements without changing the transducer family.
 
+ How accurate and stable is the T7800’s pneumatic output under different conditions (vibration, orientation, EMI, etc.)?
The T7800 delivers accuracy as precise as 0.15% of full scale under typical operation. It uses a piezoelectric-actuated disc mechanism with internal electronic feedback that ensures stable pressure output regardless of shock, vibration, and mounting orientation. Additionally, it includes RFI/EMI protection, limiting susceptibility to electromagnetic or radio interference — critical in industrial environments where such interference might otherwise destabilize control signals. All this makes the T7800 a reliable choice for demanding automation, instrumentation, or process-control systems where precise, repeatable pressure control is required.
+ What kinds of input signals and supply requirements does the T7800 support?
The T7800 supports standard industrial control signals, including 4–20 mA DC and voltage inputs (e.g., 0–10 VDC, 0–5 VDC, 1–5 VDC, 1–9 VDC, depending on configuration). For pneumatic supply, depending on the output range, the T7800 requires a supply pressure that must remain sufficiently above the maximum desired output (for extended-range units, supply pressures can go up to 125–150 psig for full 0–120 psi output). These input and supply options make it compatible with common industrial instrumentation systems and simplify integration into existing control loops.
 
+ Is the T7800 rugged and safe enough for industrial, outdoor, or hazardous-location environments?
Yes. The T7800 comes in a NEMA 4X / IP65-rated enclosure (Type 4), which makes it suitable for both indoor and outdoor installations — resistant to dust, moisture, and environmental exposure. For extended-range or specialized applications, the T7800 (and related explosion-safe variants) carry global approvals including FM, CSA, ATEX, and IECEx — supporting intrinsically safe or non-incendive use for hazardous locations. Combined with its vibration-resistant internal mechanism, the T7800 is well-suited for heavy-duty, industrial, or harsh-environment processes.  
 
 
+ What advanced features and flexibility does the T7800 offer (e.g., split-range, field-reversible, damping, mounting, tuning)?
The T7800 provides a high level of configurability for complex control applications. It supports field-reversible operation, allowing the output to be set as either directly or inversely proportional to the input signal. It is also capable of split-range control, enabling a single input signal to drive multiple functions or valves in a system. The built-in damping adjustment allows users to fine-tune response speed and stability to match the dynamics of their process. In addition, the compact design and multiple mounting options make the T7800 easy to integrate into tight or constrained installation environments. Overall, these advanced features give engineers the flexibility to optimize performance and tailor the transducer to a wide range of industrial and process-control requirements.
 


 

Downloads

Download Rotork Fairchild Model T7800 Electro-Pneumatic I/P, E/P Transducer Datasheet

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