The flow switch is an important component in your fire system, as the only other way to know your tank is empty will be upon visual inspection, leaving your site at risk of no fire protection during fire, and serious equipment damage during engine run.
Continuous cranking without fuel will burn the starter.
The float switch is a device used to determine the level of fuel in the tank, and automatically sends a signal to the annunciator.
The float switch is installed in the tank and wired to the annunciator panel.
The float ball of the level switch rises or falls with the fuel level.
When fuel level drops, the signal is closed causing the ball to fall and thus sending a low fuel signal to the panel.
Person responsible for pump house will receive a low fuel signal.
When site refuels the tank, the signal will open causing the ball to rise and cancels the low-level fuel signal to the panel.