Calibration – Campbell Scientific TB4 and TB4MM Hydrological Services Rain Gage User Manual
Page 19
TB4 and TB4MM Rain Gage
8. Calibration
The sensor is factory calibrated; recalibration is not required unless damage
has occurred or the adjustment screws have loosened. Nevertheless, the
following calibration check is recommended once every 12 months:
Field Calibration Check:
a.
Remove the housing assembly from the base by removing the three
screws and lifting upward on the housing.
b.
Check the bubble level to verify the rain gage is level.
c.
Pour water through the inner funnel to wet the two bucket surfaces.
Using a graduated cylinder, slowly pour 314 cc (19.16 in
3
) of water, over
a 15 minute period, into the collection funnel. This volume of water is
equal to .39 inches of rainfall (10 mm).
d.
After the water has passed through the rain gage, the tipping bucket
should have tipped 39 times for the TB4 or 50 times for the TB4MM.
e.
If the rain gage fails to record the correct number of tips, return the unit to
Campbell Scientific for recalibration.
Factory Calibration
If factory calibration is required, contact Campbell Scientific to obtain an
RMA (see Warranty and Assistance in the front of the manual).
15
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