Know when to disable the smoke detector. The smoke detector should only be disabled if the detector is near the end of its life. Some smoke detectors, particularly in commercial or monitored residential applications, remain useful for a long time, while others have a much more limited lifespan. You will know if a sealed smoke detector needs to be replaced if the smoke detector is giving the low battery chirp (single beeps every 30 seconds to a minute) and if there is no way to access the battery.
Purchase a near identical smoke alarm model from the hardware store. The same mount can be used for the new smoke alarm; however, if the model was updated or discontinued, you may need to remove and replace the mount.
Remove the smoke detector nearing the end of its life from the mount. This will not disable the smoke detector.
Locate the "discharge" or "disable" contacts or switches. Depending on the model, you might need to remove the back label to access this switch.
Activate the switch. Upon disabling, the smoke detector will stop beeping. You can confirm the smoke detector is inoperable by pressing the "TEST" button and confirming that there is no sound. You may need a screwdriver or coin in order to use this switch. Some sealed smoke alarms need the wires cut instead.
Immediately install the new smoke detector. Confirm it is working by pressing the "TEST" button. The alarm will report its status and may sound.
Dispose of the old smoke detector appropriately. Take the smoke detector to an electronics recycling store or your local hardware store for safe disposal.
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