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- Ideally, place the sensor above natural surfaces such as a grassy lawn.
- The international standard height for measurements of air temperature is at 1.25m (4 ft)
above ground level.
Setting up the Rain Sensor
1. Unlock the funnel-shaped top of the rain sensor by turning both knobs on the sides of the
rain sensor in an anti-clockwise direction.
2. Lift the top off the base and insert two 2 x UM-3 or “AA” size 1.5 V batteries into the battery
holder.
3. Replace the lid and secure into place by turning the knobs clockwise.
4. Place the rain sensor in a location such that precipitation can fall directly into the sensor,
ideally 2-3 ft above the ground. It may be secured into place by using the four screws provided.
5. The sensor must be accurately levelled for optimum performance. To check if the sensor is
levelled, remove the lid and check if the ball bearing inside is at the midpoint of the leveller.
Additionally, a bubble level or carpenter’s level may be used.
6. Attach the protective screen onto the top of the lid. The screen will prevent any debris
entering the sensor.
Placement Tips:
- The rain sensor should be placed in an open area away from walls, fences, trees and other
coverings which may either reduce the amount of rain rate into the sensor, deflect the entry of
wind - blown rain, or create extra precipitation runoff. Trees and rooftops may also be sources
of pollen and debris.
- To avoid rain shadow effects, place the sensor at a horizontal distance corresponding to two
to four times the height of any nearby obstruction.
- It is important that rain excess can flow freely away from the sensor. Make sure that water
does not collect at the base of the unit.
- The rain rate measurement mechanism utilizes a magnet; hence do not place any magnetic
objects around the proximity of the sensor.
