TB4-L Rain Gage

The TB4 funnels precipitation into a bucket mechanism that tips when filled to its calibrated level. Each tip is marked by a dual reed switch closure that is recorded by a data logger pulse count channel. After measurement, the water drains through two orifices (accepts 12 mm tubing) in the base, allowing the measured water to be collected in a separate container.

The TB4 contains an internal siphon mechanism that causes rain to flow at a steady rate to the tipping bucket mechanism (regardless of intensity). The siphon allows the sensor to make accurate measurements over a range of 0 to 50 cm per hour.

Benefits and Features

• • Accuracy is ±3 percent at high precipitation rates of 500 mm/hr
  • More accurate measurement of high-intensity precipitation
  • High precision—tips at 0.01-in. increments
  • Compatible with most Campbell Scientific data loggers