Number 3150-2020
Revision 0.3
Date SEP 2005
Page 3 of 5
The procedures described in this TI are specific to Campbell Scientific CS105 barometric
pressure sensors. Calibration and maintenance include tasks that are detailed in the following
five (5) major subsections:
4.1 Calibration Checks
4.2 Sensor Adjustments
4.3 Sensor Maintenance
4.4 Post-Maintenance Calibration Checks
4.5 Documentation
4.1 CALIBRATION CHECKS
A complete calibration check must be performed prior to (pre) and following (post) any
maintenance activity. The calibration check procedures described below apply to both pre- or
post-maintenance calibration checks. Refer to Figure 4-1, Example Wetness, Precipitation, and
Barometric Pressure Calibration Form, when performing calibration checks. Be sure to indicate
on the form whether the calibration is pre- or post-maintenance and note all maintenance
activities or replaced components in the “Comments” field. The form is available as an Excel
spreadsheet and should be used for both pre- and post-maintenance checks. Results of each
calibration should be in both hardcopy and digital form.
Calibration checks are performed semiannually. Should any operational check be out of
suggested tolerance, complete the calibration check before any maintenance or adjustments are
made. The following operational checks should be performed:
ANNOTATE DATA
RECORDS
Make an entry in the station log book indicating the date and
time (beginning and ending) of the calibration and maintenance
procedures. “Down” the appropriate channels on the DAS or set
the calibration flag as appropriate for the DAS being used.
Complete the following fields on the calibration form: network
and station name; current date; name of technician performing
the calibration; manufacturer, model, and serial number of the
instrument; and date of the last calibration.
RECORD READINGS Simultaneously record the pre-maintenance DVM and DAS
readings of the sensor to be calibrated.
4.2 SENSOR ADJUSTMENTS
A trimmer potentiometer is located under the plastic cover on the front panel for offset
fine adjustment. This potentiometer can be used at any pressure level to make a maximum !1
hPa (mbar) offset adjustment to the barometer output.
Consult Campbell Scientific for further instructions if a larger offset of offset/gain
adjustment is needed.
(42 paginas)
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