WS69/WH40 Rain Gauge Accuracy Issue Check Listing

Tipping bucket rainfall sensor working principle: rain falls into the receiving funnel, through the funnel into the tipping bucket, when the amount of rain reaches a certain amount (WS69 for 0.254mm, WH40 for 0.1mm), the tipping bucket loses balance and tumbles over. Every time it tumbles, it will make the switch turn on the circuit and send a pulse signal to the recorder, which will record the amount of rainfall, and so on and so forth, so that the rainfall process can be measured.

If you find that the rain gauge data is not accurate enough, please follow the steps below to check your instrument:

  1. Check to see if any debris has fallen into the rainfall funnel, such as leaves, bird droppings, etc. If any debris has fallen into the rainfall funnel, please clean it up; debris will affect the rainfall measurement.If you find that the data has returned to normal, the problem has been resolved.
  2. If there is no debris in the funnel, you can use the weather map on the ecowitt website or other weather websites to check the rainfall data from several points around your area and use this data to cross-check that your rainfall is accurate. Do not just look at the rainfall at a point near you, as the rainfall at a single point will not confirm the accuracy of your sensor, the rainfall is unevenly distributed.If you find that your rain gauge data is within reasonable limits, the problem has been resolved.
  3. Test the counting function, syringe/measuring cup to receive a small amount of water, slowly drip onto the tipping bucket, hear a slight ringing sound, see whether the APP has increased 0.2mmor 0.1mm (WS69 for 0.2mm, WH40 for 0.1mm) rain. If 0.2mm or 0.1mm of rain is added (WS69 for 0.2mm, WH40 for 0.1mm), the rain gauge operates normally. Please do not pour in water quickly, as it will cause the tipping bucket not to rotate back into position, rainfall will not be measured.
  4. Or manually simulate a rainfall and drip the water slowly, if you simulate heavy rain (100mm/24h), you need to drip 100mm of water into the tipping bucket for 3min at an even rate; if you simulate medium rain (10mm/24h), you need to drip 10mm of water into the tipping bucket for 1min at an even rate. When you are done, check the APP to see if the corresponding amount of rain has been added.
  5. After the above check, the rain data is still inaccurate, may be the internal parts are damaged, please contact the after-sales to send arain gauge body to replace.




Light rain: precipitation intensity less than 2.5mm/24h.

Moderate rain: precipitation intensity between 2.5-10mm/24h.

Heavy rain: precipitation intensity between 10-50mm/24h.

Torrential rain: precipitation intensity between 50-100mm/24h.

Back to blog

Leave a comment