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.
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.