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Differential Pressure Transducer

Technical Information

Catalogue No: C0109
Category: Air Data
Object Type: Sensor/Transducer
Object Name: Differential Pressure Transducer
Part No: B321/15
Serial No: 070/56
Manufacturer: Elliott Bros
Division: Unknown
Platform(s): Buccaneer  Lightning 
Year of Manufacture: 1956
Width (mm):
Height (mm):
Depth (mm):
Weight (g):
Location: Main Object Store

Pressure Transducer
Range 0 ± 15 P.S.I.
Type No B 321/15
Serial o 070/56


The Differential Pressure Transducer contains an aneroid capsule, 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 slider which gives an electrical output of indicated airspeed. The input range is marked as 0+/-15 psi. Four electrical leads depart from cylinder and there are two barometric connections at its base.
The base is 14mm thick and the cylinder 32mm in diameter, all in a light grey metal finish. This unit was part of the original Marconi Collection Ref: 2025

These units were probably used on aircraft of the generation of the Lightning or Buccaneer.

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