Ionisation detectors work in the following way.
Air in the dual sensing chambers is irradiated to produce ions that travel
to the positive and negative electrodes, creating a current flow.
As smoke enters the outer chamber, the flow drops and voltage increases.
The voltage is measured and an analogue signal is converted to digital for transmission to the control equipment.
Detection Principle: Ionisation Chamber
Chamber Configuration: Twin compensating chambers using
one single sided ionising radiation source
Radioactive Isotope: Americium 241
Sampling frequency: Continuous
Supply wiring: 2 wire, polarity insensitive
Supply voltage: 17 to 28 volts DC
Alarm indicator: Red LED
Dimensions: 100mm x 42mm