These limits are enforced during refuelling by a float switch in the tank, the permitted level being set by a key switch with an indication displayed in the cab if the limits are breached.
22.
As mechanical float switches can wear out, they should be periodically tested by actuating them manually to assure that they continue to move freely and that the switch contacts are opening and closing properly.
23.
Her wheelhouse is outfitted with state-of-the-art electronics : a Loran plotter, Global Positioning System for navigation, radar, VHF-FM short-range radio, and float switches that sound when the lower deck takes on too much water.
24.
Similarly, he said, if one of the inputs is connected to a float switch or a sump pump in a crawl space, the owner will be promptly notified by pager if unacceptable amounts of water are accumulating beneath the house.
