Compare Rain Sensor Products

This page presents a quick summary comparison between the various type of rain sensors available on the market.

For a detail of the various rain sensing technology, you can visit the rain sensor page.

Comparison between the Rain Sensors

The following is a summary of the various types of rain sensors that are discussed on this web page for a quick comparison.

Rain Sensor Types Optical Resistive Capacitive Mechanical Sound Weather Sensor
optical rain sensor Somfy Rain Sensor capcitive rain sensor Rain Bird Mechanical Rain Sensor Switch Rain detector using sound Diffraction Limited boltwood cloud sensor
Cheap X X X X
Reliability X  
Durable X  
Maintenance Free X X X X
Fast Detection X
No Need Power Supply X X X X X
Do not Collect Water X
Simple to Install X   X X
Simple to Interface with Other Systems X   X
Relay Contact Output (Dry Contact) X X
No Direct Contact with Water X X X X
Adjustable Sensitivity X X X
Multiple Mode of Functions X X X
Wide Range of Supply Voltage 9 to 24Vdc
or Vac
X 12Vdc Not Applicable
X 24Vdc

For Outdoor Rain Detection

For general purpose outdoor rain detection, consider the optical rain sensor. It is simple to maintain, and have relatively long lifespan compare to the other form of rain detection.

rain sensor Available from PIC-CONTROL.

This optical rain sensor accepts 12-24Vdc and has a dry contact relay output which allows you to interface an automatic awning shade motorised system, or an alarm and alert system.

Check out this page for more information on this rain sensor.

To buy this rain sensor, click here.

For Protection of Sensitive Equipment

For expensive equipment sensitive to rain water, consider using a high-end weather sensor. This weather sensor is able to accurately predict the rain even before the rain starts falling. Built-in with infra-red, humidity, wind and temperature sensor. It is a must have sensor for protecting expensive outdoor equipment.

Diffraction Limited boltwood cloud sensor     diffraction limited logo

This rain sensor is superior compared to the rest of the sensors. The disadvantage of this sensor is the price. The integration to other system is not too difficult, but you may need an electronic engineer for the interfacing work if you are not formerly trained.

For Rain Water Detection without Power

Select a mechanical rain sensor if you prefer a simple 2 wire switch to be activated when the rain water is detected. The sensor requires no power input. It is a switch contact (dry contact) which will be activated when there is water in the sensor.

The sensor will need about half a day to a day to dry and deactivate itself. A simple and inexpensive rain sensor to have if you do not need a very fast rain sensing response.

Rain Bird Mechanical Rain Sensor SwitchRain Bird Logo

Click here to purchase rainbird sensor.

For Budget Rain-Sensing

Cheap Rain Sensor DIY Kit <S$30

The resistive rain sensor is the cheapest of out. For temporary use or deployment, it can be a cost effective solution. Price starts from a few dollar to at most less than $30.

This resistive rain sensor available at Sim Lim Tower in Singapore.

Other Better Resistive Rain Sensors

Somfy Rain SensorLockwood Elevation Rain Sensor, wall mount

Click here for more resistive rain sensor available in the market.

More Rain Sensor Information

Check out more of the rain sensor products details from our rain sensor page.
rain sensor comparison table