Model TXI7850 Moisture Resistant Electro-Pneumatic Transducer from Rotork Fairchild

Model TXI7850 Moisture Resistant Electro-Pneumatic Transducer from Rotork FairchildThe TXI7850 I/P Pressure Transducer operates under the same basic principles as the TXI7800, yet improves upon the design. By encapsulating and otherwise protecting the critical components, Rotork Fairchild designed the Explosionproof TXI7850 I/P Pressure Transducer to be highly resistant to moisture within the supply air lines.

Operating Principles

The Model TXI7850 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 TXI7850 Moisture Resistant Electro-Pneumatic Transducer Features

  • Available in both standard and extended range configurations, the TXI7850 delivers vibration, shock and moisture resistance in output pressures up to 0-120 psi [0-8.0 BAR], (0-800 kPa)
  • 18 available output ranges - tremendous versatility for application design
  • Accuracy as low as 0.15% - high precision, reliable operation
  • Moisture resistant - well-suited for handling moist supply air
  • Field selectable outputs in three pressure ranges - easily matches final control element requirements
  • Field reversible feature provides output directly or inversely proportional to 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
  • Canadian registration numbers (CRN) certifications - may be used in all territories and provinces
  • FM, CSA, and ATEX approvals - carries global approval for intrinsic safety and hazardous location operation

Specifications

Model TXI7850 Moisture Resistant Electro-Pneumatic Transducer Specifications

Rotork Fairchild Model TXI7850 Moisture Resistant Electro-Pneumatic Transducer Specifications

Dimensions

Model TXI7850 Moisture Resistant Electro-Pneumatic Transducer Dimensions

Rotork Fairchild Model TXI7850 Moisture Resistant Electro-Pneumatic Transducer Dimensions

Q & A

Q&A Section with Expand/Collapse Icons

Model TXI7850 Moisture Resistant Electro-Pneumatic Transducer Q & A

+ What exactly is the TXI7850, and what does it do?
The TXI7850 is an electro-pneumatic I/P (current-to-pressure) transducer: it converts a DC electronic control signal (e.g., 4–20 mA) into a proportional pneumatic output pressure, which can be used to drive control valves or actuators. The unit uses a piezoelectric actuator disk and internal feedback pressure control to maintain a stable, precise output — ensuring reliable operation even under vibration, moisture, or varying supply conditions.
 
+ What operating ranges and performance specs does the TXI7850 support?
The TXI7850 supports up to 18 output pressure ranges, with output pressures up to 0–120 psi (0–8.0 bar / 0–800 kPa) depending on configuration. It offers high accuracy, as low as 0.15% (full-scale) under typical conditions. The transducer also features field-selectable output ranges (three ranges) and a field-reversible output (direct or inverse), enabling flexible matching of many types of final control elements.
+ Is the TXI7850 suitable for harsh, explosive, or wet environments — e.g,. outdoor, natural gas, corrosive media, or supply air with moisture?
Yes. The TXI7850 is designed for demanding environments: the enclosure is rated Explosion-proof NEMA 4X / IP65 (Type 4), for both indoor and outdoor use. It is moisture-resistant, with critical components encapsulated to tolerate moist supply air lines — a common concern with pneumatic systems. Importantly, the standard (and optional) versions do not contain copper-based metals, which makes them safer for use with natural gas or other corrosive media; there is an optional version explicitly approved for natural gas or industrial methane supply media.
 
+ What certifications and approvals does TXI7850 carry — is it compliant with relevant industrial standards (e.g., hazardous locations, global code)?
The TXI7850 carries global approvals suitable for hazardous locations, including FM, CSA, and ATEX certifications. It also has Canadian Registration Numbers (CRN) — meaning it is registered for use in all Canadian territories and provinces. These certifications make it a compliant choice for industrial, oil & gas, chemical, and other regulated applications in many regions around the world.  
 
 
+ How easy is installation and configuration — and can output be adjusted/field-tuned on site?
The TXI7850 is designed for straightforward installation: it can be mounted directly on a flat surface using its built-in tapped mounting holes. Output range selection is field-selectable (three output ranges), and the field-reversible feature lets you choose direct or inverse output relative to the input signal, which gives flexibility to match a variety of valve actuators or control elements. Additionally, internal damping adjustment (on the PC board) allows tuning for optimum response and stability — especially useful if there’s a large downstream volume or the pneumatic system needs fine-tuning.
 


 

Downloads

Download Rotork Fairchild Model TXI7850 Moisture Resistant Electro-Pneumatic 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.