| 摘要 |
A float (2) is free to rise and fall in a tube (29) within the liquid being monitored and is attached by a wire (31) to a magnetic counterweight (5) which moves in a second tube (30). Magnetic contacts (6,17,20) give visual and audible warning (8,9,18) of liquid level and two relays (27,28) operate a pump (15) to restore a preset liquid level and provide operating indication (16)
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