The phrase "alarm activated" is correct and usable in written English.
It can be used in contexts where you want to indicate that an alarm system has been turned on or triggered.
Example: "As soon as the door was opened, the alarm activated, alerting the security team."
Alternatives: "alarm triggered" or "alarm set off".
One person with dementia no longer went into her kitchen after dark because the continual triggering of her telecare system's door exit alarm, activating when near the external kitchen door, frightened her.
In stark contrast, hits and false alarms activated the pre-SMA comparably (p>0.25; Figure S1b), suggesting that false alarms may primarily arise from changes in internal (baseline) levels of activity rather than by fluctuations in sensory evidence (see Discussion).
When the wire was touched or cut, an alarm was activated to alert nearby guards.
The sense of alarm activates the diagnostic process and induces the doctor to initiate specific management to prevent serious health problems.
Statement 2: A 'sense of alarm' activates the diagnostic process by stimulating a GP to formulate and weigh up working hypotheses that might involve a serious outcome.
However, don't always rely on the alarm to solely alert the child - by the time the bedwetting alarm activates, it's often too late to stop the stream.
Here is an example combining liveness and safety properties of a single computation: "Whenever a state of alert is reached, the alarm is activated and remains activated until a safe state is eventually reached".
Top 7: Fly-away alarm clock ($53) This thing will fly off when the alarm is activated, forcing you to wake up and catch it.
The supermarket has an alarm system, the authorities said, but it was not clear yesterday whether the alarm was activated when the window was shattered or whether it had been turned on at all.
Another type of alarm is actuated by a photoelectric cell; when smoke darkens the room slightly, the alarm is activated.
