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科技与生活常识·英语30篇（1）

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How Automatic Faucets Detect Hands Without Touching — And Why They Sometimes Fail

How Automatic Faucets Detect Hands Without Touching — And Why They Sometimes Fail

自动水龙头如何非接触感应双手——以及为何有时失灵

  1. Automatic faucets use infrared sensors to detect hand movement near the spout.
  2. When your hand enters the sensing zone, the sensor sends a signal to open the water valve.
  3. These systems work well in bright light but may misread reflections from shiny surfaces.
  4. Some models adjust sensitivity automatically, while others need manual calibration by maintenance staff.
  5. Cold hands or fast motions can delay activation because the sensor needs stable heat patterns.
  6. They save water by shutting off within one second after hands leave the zone.
  7. Public restrooms install them to reduce germ transmission during handwashing routines.
  8. Battery-powered versions beep softly when power runs low, prompting replacement.
  9. Newer units include anti-drip features that stop residual flow after shut-off.
  10. You can test responsiveness by holding your palm still for two seconds near the sensor.
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