Once a week.
You should press the test button at least once a month to make sure the detector has a battery in it and the beeper works. Batteries should be replaced once a year. Pick a date you can remember like when the clocks change each fall or spring. For units without batteries, you should regularly check them anyway, and watch for the expiration date, i.e., 10 years after it was first activated.
Photo-electric (PE - as opposed to the ionization type of) smoke detectors do indeed use the reduction of light energy at the receiving end to "Sound The Alarm". Whether or not this is IR energy, I can't say. Might someone else please fill this in? Thanks.
Restraints should be checked every 1-2 hours to ensure proper circulation and prevent injury. This is especially important for individuals who are immobilized or have limited mobility.
If there is very little oxygen present, the flame should turn blue.
The oxygen atoms in CO2 come from the process of photosynthesis in plants. During photosynthesis, plants take in carbon dioxide from the air and water from the soil, and using sunlight as energy, convert them into glucose (sugar) and oxygen.
Just like your smoke detectors, sprinklers should be checked at least twice a year. A good way to remember this is to check at daylight savings time (every six months).
Smoke detectors should be replaced every 10 years to ensure they are functioning properly.
Smoke detectors should be replaced every 10 years to ensure they are functioning properly and providing reliable fire detection.
Smoke detectors should be replaced every 10 years to ensure optimal safety in a home.
Smoke detectors should be replaced every 10 years to ensure they are functioning properly and providing adequate protection.
DailyDaily
monthly
Commercially speaking, in the UK they have to be checked annually, and signed.
Smoke detectors should be replaced every 10 years to ensure optimal safety in a home.
brake linings should be checked at 15,000 and 25,000 miles and then every 5,000 miles after that.
You should press the test button at least once a month to make sure the detector has a battery in it and the beeper works. Batteries should be replaced once a year. Pick a date you can remember like when the clocks change each fall or spring. For units without batteries, you should regularly check them anyway, and watch for the expiration date, i.e., 10 years after it was first activated.
Every time it is worn!