TB4, TB4MM, CS700, and CS700H Tipping Bucket Rain Gages
19
4.
Push filter/siphon assembly back into place (FIGURE
Do not twist the filter/siphon assembly while putting it back
into place.
FIGURE 9-5. Reassembling the CS700
5.
Place the housing assembly back onto the base and tighten the three screws
that secure the housing onto the base.
9.3 Calibration Check
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:
1.
Remove the housing assembly from the base by removing the three
screws and lifting upward on the housing.
2.
Check the bubble level to verify the rain gage is level.
3.
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 0.39 in of rainfall (10 mm).
4.
After the water has passed through the rain gage, the tipping bucket
should have tipped 39 times.
5.
If the rain gage fails to record the correct number of tips, return the
unit to Campbell Scientific for recalibration (see
front of the manual).
CAUTION
To re-assemble,
push the
filter/siphon
assembly back
in place.
Do not twist
.
