Campbell CM10K Dokumentacja Pobierz pdf (Strona 47)

Figure 6. Diagram illustrating operation and calibration schedules for Temperature/RH sensors (also applies

to the radiation sensors). Sensors are sent out for calibration at the end of their second year of operation

except for the first year, when sensor 2 is sent out (to get sensors out of sync and allow alternation). During

year 2 and afterwards there are always 2 sensors operational and one is out for calibration (and can be used

as a spare when it returns).

4.16 Precipitation gauge (TB4MM-L)

Equipment/supplies needed:

• Pen/Pencil

• Allen wrench

• Blank Sensor Installation/Calibration Form

• Blank Sensor Calibration Metadata Form

The TB4 requires very little maintenance and should work well as long as the tipping mechanism

is not disturbed. However, the precipitation gauge should be calibrated annually to ensure

accurate rainfall measurements. Record the results in the Sensor Installation/Calibration Form.

The manufacturer recommends the following process:

1. Remove the cover. Remove the cover from the gauge by loosening the screws on the

sides.

2. Level the gauge. Check the bubble level to ensure the gauge is perfectly leveled. If not,

adjust the nuts on the mounting bracket to level the unit.

3. Pour water. Slowly pour through 314 cc of water through the inner funnel over a 15-

minute period (this is equivalent to 10 mm of rain). Have a second person count the

number of tips as the water is poured. The gauge should have tipped 39 times.

4. Record the calibration event. Fill in the time, date and number of tips in the Sensor

Calibration form. If the gauge did not tip 39 times, send it back to the manufacturer for a

recalibration and complete the Sensor Calibration Metadata Form (Appendix A.5.

Sensor Calibration Metadata Form). Use readings from the manual precipitation gauge

until the tipping bucket is recalibrated

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Campbell CM10K Dokumentacja Strona 47