Rain Sensors

Rain sensor or rain switch is a switching device actuated by rainfall. There are two main applications for rain sensors. The first is a water conservation device connected to an automatic irrigation system that causes the system to shut down in the event of rainfall. The second is a device used to protect the interior of an automobile from rain and to support the automatic mode of windscreen wipers.

Irrigation Rain Sensors: Rain sensors for irrigation systems are available in both wireless and hard-wired versions, most employing hygroscopic disks that swell in the presence of rain and shrink back down again as they dry out. Wireless and wired versions both use similar mechanisms to temporarily suspend watering by the irrigation controller. RainSensors are designed to conserve water by preventing irrigation during or after sufficient rainfall.

Automotive Rain Sensors: Rain Sensor makes the wiper system a “set-and-forget” function. This is a fully automatic moisture-activated system that detects how hard rain or snow is falling and determines when to activate the wipers and how fast to run the wiper motor.

Rain Gauges

Rain gauge (also known as a Udometer or a Pluviometer or a Pluviograph or an Ombrometer) is a type of instrument used by meteorologists and hydrologists to gather and measure the amount of liquid precipitation over a set period of time. Types of rain gauges include graduated cylinders, weighing gauges, tipping bucket gauges, optical rain gauges, and simple buried pit collectors. Each type has its advantages and disadvantages for collecting rain data.

Applications of Rain Sensors & Rain Gauges

Using an advanced rain sensing system, analog signal processing, and control algorithms, weather monitoring technology provides safety, convenience, and comfort in various weather conditions. Various applications of rain sensors and rain gauges are:

  • Automatic control of skylights, windows, and louvers
  • HVAC
  • Automatic retraction of awnings
  • Wiper control for specialized vehicles and equipment
  • Boat and ship window wiper control
  • Refrigeration frost sensing
  • Sophisticated irrigation control
  • Industrial/process control
  • Meteorology- especially low rainfall and mobile application