Top mounted level switches work on permanent magnet reed switch basis. The floats which
contain permanent magnets move freely between their stops rising or falling with liquid level
movement. Hermetically sealed within the tube are reed switches, completely isolated from the
medium. The magnet's field actuates the reed switch as the float moves while the
stoppers restrict overrun and prevent the reed switch returning to its original position. Stopper
positions should not be changed.
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