Aspirating smoke detector maintenance is simple, but it must not be skipped. The system pulls air through pipes and a filter all day, so dust slowly builds up and the airflow changes.
In this guide, we explain what to check, how often and what to do when a reading looks wrong. Always follow the manual of your system and the rules of your country.
Why aspirating smoke detector maintenance matters
An aspirating detector works only if clean air flows through the pipes. A blocked hole or a dirty filter lowers the airflow, and this slows the smoke on its way to the sensor. Regular maintenance keeps the detector as sensitive as the day it was commissioned.
In addition, aspirating smoke detector maintenance gives you proof for your insurer and for the authorities that the system works.
What to check at every service visit
Use this short list as a base for your aspirating smoke detector maintenance.
- Fault and event log. Read it first, because it shows problems that came and went.
- Airflow readings. Compare them with the commissioning values.
- Filter condition. Check the dust filter and replace it when the maker advises.
- Pipes and joints. Look for cracks, loose joints and damaged pipe supports.
- Sampling holes. Check that none is blocked by paint, dust or new fittings.
- Signals to the panel. Test that alarm and fault signals arrive.
How to change the filter
The filter protects the sensor from dust. Also, replace it with the exact spare part for your detector. The ModuLaser, MiniLaser and HSSD2 share the same replacement dust filter, so one spare part code covers the whole family.
- Tell the building users and put the panel in test mode.
- Open the detector as shown in the manual.
- Remove the old filter and fit the new one in the same direction.
- Close the detector and check that the airflow returns to a normal value.
- Write the date of the change in the service record.
A simple maintenance schedule
The table below gives a practical base. Your local rules may ask for more.
| When | Wat u moet doen |
|---|---|
| After commissioning | Store the airflow baseline and the transport times |
| Every visit | Read the event log, check airflow and look at the display |
| Yearly, or as the rules require | Run the full test with smoke, check the filter and the pipes |
| After any building work | Check pipes and holes, and repeat the smoke test if the layout changed |
Maintenance in dusty and cold sites
Dusty sites need filter checks more often. Cold stores and clean rooms have their own needs, so read our guide on cleanroom fire detection. For the full test method, see aspirating smoke detector testing.
Products and spares
Spare parts for the ModuLaser and MiniLaser include the replacement dust filter (9-30699N), the 3 m sampling pipe and the STX2410-E power supply. For technical help, visit our support page.
Sleutelafhaalpunten
- Clean airflow is what keeps an aspirating smoke detector sensitive.
- Read the event log, compare the airflow and check the filter at every visit.
- The ModuLaser, MiniLaser and HSSD2 share the same replacement dust filter.
- Repeat the smoke test after any building work that touches the pipes.
Veelgestelde vragen
How often should I change the filter of an aspirating smoke detector?
It depends on how dusty the room is. Follow the maker’s manual and change it when the airflow reading or the display tells you to.
What happens if I never maintain the detector?
Dust and blocked holes reduce the airflow, so smoke reaches the sensor later. The detector may also raise airflow faults.
Can I do the maintenance myself?
Simple checks and filter changes can often be done by trained site staff. The full test with smoke and the panel checks should be done by a qualified engineer.
Do I need to repeat the test after building work?
Yes. New walls, ducts or racking can change the airflow, so check the pipes and repeat the smoke test.
Learn how the technology works in our aspirating smoke detector guide, or see what can go wrong in our article on false alarms.