They are green when no alarms have been triggered, and they switch to red to indicate an alarm. At the same time that the LED turns from green to red, the front-mounted aural and visual indicators will turn on. The aural and visual alarms can be turned off and reset with a front-mounted pushbutton. A toggle switch is included to select either aural and visual, or visual only, alarms to turn on. These are associated with four internal DPDT dry- contact relays which provide external alarm indications of the internal alarm status.
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