Model TXI7800/7801 Explosion-Proof Transducer

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The Fairchild TXI7800/7801 Explosion Proof Transducer is an electronically controlled pressure sensitive device that converts a current signal to a pneumatic output. Featuring an option for approved use with Natural Gas or Industrial Methane as a supply media, and Standards Australia approval available.


  • Internal electronic feedback maintains precise output pressure control.
  • Piezoelectric actuator disk provides stability regardless of vibration or position.
  • RFI/EMI protection eliminates susceptibility to electromagnetic interference.
  • Field selectable outputs in three pressure ranges match final control element requirements.
  • Field reversible feature provides output that is directly or inversely proportional to input signal.
  • Does not contain copper-based metals.
  • Compact size for use in restricted areas.
  • Damping adjustment allows tuning for optimum response.
  • Optional version approved for use with Natural Gas or Industrial Methane as a supply media.
  • Explosion-proof NEMA 4X, IP65, Type 4 enclosure for outdoor and indoor installations.
  • Optional tapped exhaust port vents exhaust gas.
  • Canadian Registration Numbers (CRN) certification for all territories and provinces.

Operating Principles

The Fairchild TXI7800/7801 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.


See Catalogue Pages for full specification including associated approvals.

Catalogue PDF: application/pdf
Operational PDF: application/pdf
Located in: Transducers

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