Model T7900 Electro-Pneumatic Transducer

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The Fairchild T7900 series Electro-Pneumatic Transducers include the Fairchild T7900 with Analogue Output and the Fairchild T7900D with DeviceNet™ Communication.
The Fairchild T7900 controls pressure in proportion to an analogue electrical input signal. An internal feedback sensor monitors output pressure to achieve high accuracy.
The Fairchild T7900D Transducer with DeviceNet™ Communications controls output pressure in response to a digital communication command.


  • RFI/EMI protection eliminates electromagnetic and radio interference.
  • Output pressure displays in psig, BAR, kPa, or user-defined pressure units.
  • Reverse acting capability for analog input and output signals.
  • Select Current or Voltage mode for input signal or optional analog channels using the keypad.
  • Independently adjustable PID tuning coefficients.
  • Fully functional keypad and display.
  • Backlit Liquid Crystal display screen.

Operating Principles

The Fairchild T7900 Series Transducers have a closed-loop, integrated, microprocessor control system that regulates outlet pressure. You can control the output from the Fairchild T7900 using the keypad or from an analog control signal. You can control the output from the Fairchild T7900D using the keypad and through DeviceNet™ Communication network.

The Feed and Bleed Solenoid Valves control pressure in the Signal Chamber of the Booster Section. A pressure sensor measures the outlet pressure and provides a feedback signal to the Electronics Section. Any variation in pressure between the setpoint and the outlet pressure activates the Feed and Bleed Solenoid Valves to change the output pressure.


Supply Pressure1
200 psig, [14 BAR], (1400 kPa) Maximum

Pneumatic Outputs psig:
Minimum Span psig:

Input Signal
4-20 mA, 0-10 VDC
Flow Rate (SCFM)
100 (170 m³/HR) @ 100 psig, [7 BAR], (700 kPa) supply @ 20 psig, [1.5 BAR], (150 kPa) setpoint
Exhaust Flow (SCFM)
50 (85 m³/HR) @ 60 psig, [4 BAR], (350 kPa) d ownstream pressure @ 5 psig, [.35 BAR], (35 kPa) above setpoint
Air Consumption
0 @ steady state output with Deadband @ 1 % of Full Scale
Supply Pressure Effect
No Measurable Effect
Electrical Supply
24 VDC ± 10 %
Power Consumption
Less than 5 watts
Analog Output Signal / Impedence
4-20 mA/500 ohms Maximum, 0-10 VDC/400 ohms Minimum
Deadband (ISA S51.1)
Adjustable from 0 to 10 % of Full Scale
Unit Accuracy (ISA S51.1)
Less than 0.50% Output Span
Frequency Response
-3 db @ 1 HZ per ISA S26.4.3.1 load Configuration A
Vibration Effect
Less than 1 % of Span under the following conditions: 5 - 15 Hz @ 0.8 inches constant displacement 15-500 Hz @ 10 g’s
RFI/EMI Effect
Less than 0.5%. EMC Directive 89/336/EEC European Norms EN 50081-2 & EN 50082-2.
Temperature Range
0°F to + 160°F, (-18°C to + 71°C)
Materials of Construction
Body and Housing: Chromate Treated Aluminum
Cover and Pintle: Acetel Plastic
Trim: Zinc Plated Steel
Elastomers: Fluorocarbon and Silicone
Finish: Epoxy
1Supply Pressure must be no less than 5 psig, [0.35 BAR], (35 kPa) above maximum output.

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

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