Calibrate a G2-Rain

The G2-RAIN’s included rain gauge comes factory calibrated. However, to ensure the most accurate measurements this calibration should be verified regularly.

    1. Remove the rain gauge from the G2-RAIN-RTU base by unscrewing the 3 bolts


    1. Remove the rain gauge’s outer cover by loosening the three retaining screws and lifting up


    1. Level the gauge using the bulls-eye level


    1. Move the adjustment screw (under the opposite bucket) all the way counter-clockwise


    1. Using a 20cc syringe, weigh out the amount of water using the following table (zero the weight of the syringe)
      Model Number CalibrationGrams per Tip
      G2-RAIN-0.01”0.01 inch of rain8.40 grams
      G2-RAIN-0.1mm0.1 mm of rain3.31 grams
      G2-RAIN-0.2mm0.2 mm of rain6.62 grams
      G2-RAIN-0.5mm0.5 mm of rain16.54 grams
      G2-RAIN-1.0mm1.0 mm of rain33.08 grams


    1. Fill the bucket with the syringe


    1. Slowly turn the adjustment screw clockwise until the bucket tips


    1. Repeat for the other bucket


    1. Confirm the calibration by replacing the outer cover and letting a known amount of water flow through the gauge until 5 tips have occurred for each bucket


    1. Before beginning the measured test, let several tips occur to ensure the assembly is wet


    1. Measure the output from each bucket separately


  1. Make any necessary changes to the adjustment screws ¼ turn at a time until the expected measurement is achieved