GRAND RAPIDS, Mich. — Gerald R. Ford International Airport was evacuated Friday afternoon after an alarm was triggered. Around 4 p.m., GRR officials said a water overflow alarm was activated in the ...

On Sunday, at approximately 4:09 a.m., the Grand Forks Fire Department responded to a water overflow alarm at Expressway Inn and Suites on 11th Ave S. When fire crews arrived on scene, they saw smoke ...

Here is another interesting hobby circuit built around the popular and inexpensive 555 IC. It is nothing but a water sensor, which you can be configured as a rain alarm, water tank overflow alarm, ...

The circuit was intended for monitoring and measuring the fluid level or content in a storage tank or reservoir by providing visual display with an audible alarm that can be switched. Light Emitting ...