This is the Apollo 55000-217 series 65 ionisation smoke detector (no base) - the standard version. This ionisation smoke detector uses a low activity radioactive foil to detect fire by irradiating the air in the smoke chamber and causing a current flow. If smoke enters the chamber, the current flow is reduced, leading to an alarm.
Note: this smoke detector requires a base (FX340) in order to operate, and it works mainly with the Apollo range of conventional fire alarm system.
This is the standard version, Apollo 55000-217 ionisation smoke detector (no base).
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