The alarm signal is switched on or off by relay contacts in the controller, and the activation of the relay is based on the threshold value set by the controller. Typical alarm sequence is low alarm yellow light, high alarm red light and sound signal. Audible alarm signals can often be eliminated while the alarm source is determined. However, a simple switch cannot have an audible alarm when there is no signal, because the alarm condition is maintained. Therefore, it is important to consider the alarm processor to ensure security.
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