CO Detector – Inspection Procedure
Use this detailed guide to verify carbon monoxide detectors for safety, performance, and compliance with indoor air standards.
Test Button Verification
- Notify building occupants before testing
- Press and hold test button until alarm sounds
- Confirm loudness, LED indicator, and reset after release
- Document test duration and any irregularities
Battery Condition Check
- Inspect battery compartment for corrosion
- Ensure battery voltage is sufficient
- Replace with fresh batteries if due or expired
- Label replacement date on detector
Gas Testing (Optional)
- Use calibrated CO gas to verify detection response
- Place applicator at sensor vent and release short bursts
- Verify alarm activation and response time
- Vent area post test and reset unit
Sensor Age and Location Verification
- Check manufacture and install dates
- Ensure placement complies with height and distance rules
- Confirm installation in sleeping areas and utility spaces
- Identify units due for end-of-life replacement (5–7 years)