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  2. Pressure switch - Wikipedia

    en.wikipedia.org/wiki/Pressure_switch

    Industrial pressure switches may have a calibrated scale and pointer to show the set point of the switch. A pressure switch will have a hysteresis, that is, a differential range around its setpoint, known as the switch's deadband, inside which small changes of pressure do not influence the state of the contacts. Some types allow adjustment of ...

  3. Automated pool cleaner - Wikipedia

    en.wikipedia.org/wiki/Automated_pool_cleaner

    The CDC was founded (in 1946), followed by the Cabinet-level Department of Health, Education and Welfare (in 1953), now the Department of Health, and Human Services and its eleven operating divisions, the National Health Service Corps (in 1977), and a variety of private and non-profit aquatic organizations such as the National Spa and Pool ...

  4. Dry running protection - Wikipedia

    en.wikipedia.org/wiki/Dry_running_protection

    There are three different methods for detection of water shortage: Pressure switch on suction manifold or float switch/electrode relay in the supply tank: Dry-running protection with pressure/level switch. Measurement of inlet pressure in the suction manifold by means of an analogue pressure transmitter: Dry-running protection with pressure ...

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  7. Swimming machine - Wikipedia

    en.wikipedia.org/wiki/Swimming_machine

    Single-zone models are typically a fiberglass pressure-driven exercise pool that has swim jets at one end, and one or more spa seats fitted with massage jets at the other. [6] Swimmers and athletes have praised the integration of both a hot tub and swimming machine model since they can use it for exercising and recreational purposes.

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  9. Polar vortex headed for US will bring ‘exceptionally cold ...

    www.aol.com/news/polar-vortex-headed-us-bring...

    That means arctic air is blasting over the US, while pressure changes and the motion of the polar vortex whip up high winds and create a perfect recipe for wintry weather.

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