Model TXI7800 Explosion-Proof Transducer from Rotork Fairchild

Rotork Fairchild Model TXI7800 Explosion-Proof TransducerDesigned for use in hazardous environments, the Rotork Fairchild TXI7800 series product is an explosion-proof I/P pressure transducer. It operates under the same principles as the T7800 product; however, the TXI series includes NEMA 4X explosion-proof construction. Our design isolates the electronics chamber from the pneumatic section, thereby creating a safer and longer service life product, especially for applications handling natural gas.

Operating Principles

The Model TXI7800 Transducer is an electronically controlled pressure-sensitive device that converts a current signal to a pneumatic output. This device is composed of the Primary Converting Section and the

Relay Section. The Piezoelectric ceramic disk in the Primary Section functions as a flapper. The flapper and the nozzle work together to control the signal pressure in the Relay Section. The signal pressure acts on a diaphragm assembly that controls the pressure in the output chamber.

The output pressure is sensed by the lower control diaphragm to maintain the output pressure. The output pressure is also sensed by the feedback control circuit, which compares the output pressure and input signal (setpoint) to maintain constant output pressure.

The Damping Adjustment on the PC Board allows tuning the transducer for optimum response and stability. Large downstream volumes generally require more damping to achieve output pressure stability.

Features

Model TXI7800 Explosion-Proof Transducer Features

  • In the Extended Range units, the TXI7800 series will also deliver 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 selectable outputs in three pressure ranges - easily match final control element requirements.
  • Field reversible feature provides an output directly or inversely proportional to the input signal.
  • Does not contain copper-based metals - designed for use with natural gas and corrosive media.
  • Optional version approved for use with natural gas or industrial methane supply media.
  • Explosionproof NEMA 4X, IP65, Type 4 enclosure - allows for outdoor and indoor installations.
  • FM, CSA, ATEX, and IECEx approvals - carry global approval for intrinsic safety and hazardous location operation.
  • Canadian registration numbers (CRN) certifications - may be used in all territories and provinces.

Specifications

Model TXI7800 Explosion-Proof Transducer Specifications

Rotork Fairchild Model TXI7800 Explosion-Proof Transducer Specifications

 

 

Model TXI7800 Explosion-Proof Transducer Specifications Model TXI7800 Explosion-Proof Transducer Extended Range Specifications

Dimensions

Model TXI7800 Explosion-Proof Transducer Dimensions

Model TXI7800 Explosion-Proof Transducer Dimensions

Q & A

Q&A Section with Expand/Collapse Icons

Model TXI7800 Explosion-Proof Transducer Q & A

+ What is the TXI7800 — and what applications is it designed for?
The TXI7800 is an explosion-proof I/P (current-to-pneumatic) pressure transducer made by Fairchild Industrial Products (distributed by Rotork), intended for hazardous industrial environments. It converts a DC input signal — typically 4–20 mA — into a controlled pneumatic output, which can then actuate valves or other pneumatic control elements. Because it’s certified for explosion-proof and hazardous locations (FM, CSA, ATEX, IECEx), it is especially suited for applications such as natural-gas handling, petrochemical, oil & gas, and other potentially flammable or corrosive environments.
 
+ What output ranges, accuracy, and customization options does the TXI7800 offer?
The TXI7800 provides up to 18 output pressure ranges with extended models reaching 0–120 psi, allowing it to match a wide variety of pneumatic control applications. It delivers high accuracy at approximately ±0.15% of full scale and supports field-selectable pressure outputs. The unit can also be configured for either direct or inverse proportional output, making it adaptable to many control system requirements.
+ Is the TXI7800 safe to use in hazardous, corrosive, or gas-service environments — and what certifications does it have?
Yes. The TXI7800 is built with an explosion-proof NEMA 4X / IP65 / Type 4 enclosure, making it suitable for both indoor and outdoor installations in harsh environments. It also does not contain copper-based metals, which makes it compatible with natural gas or other corrosive/harsh media — a key requirement in many gas-service applications. For safety and regulatory compliance, the TXI7800 holds FM, CSA, ATEX, and IECEx approvals, and also meets certification requirements (e.g., Canadian Registration Numbers, “CRN”) — meaning it’s globally certified for hazardous-location operation. So if your application involves natural gas, industrial methane, corrosive gases, or potentially explosive atmospheres, the TXI7800 is explicitly designed for those conditions.
 
+ What input and supply requirements are needed for proper TXI7800 operation?
The TXI7800 operates on a standard 4–20 mA input signal and requires a clean air supply, typically between 125 and 150 psig, depending on the desired output range. It offers sufficient flow capacity for most pneumatic actuators and maintains stable output through its internal piezoelectric control mechanism, ensuring reliable performance even in demanding industrial environments. 
 
 
+ How does TXI7800 compare to non-explosion-proof or simpler I/P transducers (i.e. why choose TXI7800 specifically)?
The major differentiators for TXI7800 compared to standard I/P transducers are explosion-proof construction, corrosion resistance, and global hazardous-location certifications, which standard units may lack. The enclosed, isolated electronics chamber and non-copper metal design enhance safety and longevity in corrosive, gas-service, or hazardous-gas environments (e.g., natural gas). Moreover, the high precision (0.15% FS), wide range of output options, field-selectability, and reversibility make TXI7800 more versatile than simpler fixed-range transducers — especially where precise control and flexibility are required. In short: you pick TXI7800 when your application demands safety, regulatory compliance, durability, and precise pneumatic control — especially in hazardous or gas-service applications.
 


 

Downloads

Download Rotork Fairchild Model TXI7800 Explosion-Proof Transducer Datasheet

Call us today at (855) 737-4714 to learn more, or fill out our online form, and someone will get back to you.

 
You were tireless in your support and it will not be forgotten!
 
When we needed technical assistance and application support, Valin was there for us. Their knowledgeable engineers saved us an invaluable amount of time, helping us get up and running quickly. We are very happy with their services.