What type of alarm is activated by a flow of water in an automatic sprinkler system?

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Multiple Choice

What type of alarm is activated by a flow of water in an automatic sprinkler system?

The key idea is that this alarm is triggered directly by water moving through the sprinkler system. A water motor alarm uses the flowing water to drive a small turbine or motor, which then powers an audible alarm (like a bell or gong). This makes the alarm respond specifically to flow, not just to pressure changes in the system. Pressure-based alarms rely on a change in system pressure, which can occur for reasons other than actual flow, so they aren’t the direct signal asked for. A vane-type alarm is another flow-sensing option, but the classic flow-activated alarm described here is the water motor alarm, since it converts the flow into an immediate audible alert.

The key idea is that this alarm is triggered directly by water moving through the sprinkler system. A water motor alarm uses the flowing water to drive a small turbine or motor, which then powers an audible alarm (like a bell or gong). This makes the alarm respond specifically to flow, not just to pressure changes in the system. Pressure-based alarms rely on a change in system pressure, which can occur for reasons other than actual flow, so they aren’t the direct signal asked for. A vane-type alarm is another flow-sensing option, but the classic flow-activated alarm described here is the water motor alarm, since it converts the flow into an immediate audible alert.

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