CEA Fundamentals Block 3 Practice Test 2026 – Comprehensive All-in-One Guide to Exam Success!

Detectors can convert a physical event into an electrical signal using different physical effects, and the Systron Donner Detector System uses a pneumatic transduction. In a pneumatic detector, a sealed gas chamber experiences a small pressure change when the event occurs; that pressure shifts a diaphragm or piston, which is connected to a sensor to produce an electrical signal proportional to the pressure change. This is distinct from thermoelectric (voltage from temperature differences), piezoelectric (voltage from crystal stress), or radiative (photon-based detection) principles. So the system’s signal comes from changes in gas pressure—a pneumatic mechanism.