Final answer:
Fire detection systems must be adjusted periodically for reliability except for factory calibrated detectors, which do not require post-installation adjustments but must still be tested. Regular testing, as per safety codes, typically occurs annually but frequency varies by risk and regulation.
Step-by-step explanation:
All fire detection systems must be tested and adjusted periodically to maintain proper reliability and operating condition, except that factory calibrated detectors need not be adjusted after installation. The frequency of the testing and maintenance will vary depending on the specific system in use and the regulations that apply to the building or area where the system is installed. It is typically a requirement of fire safety codes that these systems be tested at least annually, but more frequent testing may be necessary for systems used in high-risk areas or to meet the conditions of certain occupancies such as healthcare facilities, schools, and industrial sites.
While factory calibrated detectors are an exception to the adjustment rule, they must still be tested to ensure that they are functioning correctly after installation. These types of detectors are pre-set by the manufacturers and are designed to be less susceptible to environmental changes that would otherwise necessitate recalibration post-installation. However, regardless of the calibration status, routine testing is crucial for the safety and efficacy of any fire detection system.