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Air Data System, Pitot-Static Capsule Sensor Mechanism

Technical Information

Catalogue No: C0121
Category: Air Data
Object Type: Sensor/Transducer
Object Name: Air Data System, Pitot-Static Capsule Sensor Mechanism
Part No: None
Serial No: None
Manufacturer: Elliott Bros
Division: Unknown
Year of Manufacture: 1960
Width (mm):
Height (mm):
Depth (mm):
Weight (g):
Location: Main Object Store



Marconi Collection Ref: 2037

The Differential Pressure Transducer contains two aneroid capsules, or diaphragms, which expands and contracts with the pressure input from the pitot tube. The case around the diaphragm is airtight and is vented to the static port. Some units will have multiple aneroid capsules to multiply the movement. The difference between the pitot pressure and the static pressure is called dynamic pressure. The greater the dynamic pressure, the higher the airspeed. The movement of the diaphragm is mechanically coupled to a non-linear cam assembly with two rows of fifteen adjustable grub screws to set the desired profile. Within the casing is a wire wound resistor which is driven by the cam mechanism such that an electrical output of indicated airspeed is provided corrected by the cam profile for the non-linearity of the diaphragm movement.

This is an item from the original Marconi Collection and is without the sealed cover over the diaphragm assembly and also lacks the non-linear cam.

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