Campbell RAWS-H Remote Instruction Manual

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Campbell RAWS-H Remote Instruction Manual Manual pdf 21 page image

RAWS-H Remote Automated Weather Stationstation. More difficult maintenance, such as sensor calibration, sensorperformance testing (i.e., bearing torque), and sensor component replacement,generally requires a skilled technician, or send the instrument to CampbellScientific. A station log should be maintained for each weather station thatincludes equipment model and serial numbers and maintenance that wasperformed.Consult the equipment manual for routine maintenanceprocedures.NOTEContact Campbell Scientific, Inc., phone (435) 227-9000, for aRMA number before returning sensor or equipment for service.NOTE8. References8.1 RAWS Orientation8.1.1 Determining True North and Sensor OrientationOrientation of the wind direction sensor is done after the datalogger has beenprogrammed and the location of True North has been determined. True Northis usually found by reading a magnetic compass and applying the site-specificcorrection for magnetic declination; where the magnetic declination is thenumber of degrees between True North and Magnetic North. Magneticdeclination for a specific site can be obtained from a USGS map, local airport,or through the web calculator offered by the USGS (Section 8.1.2). A generalmap showing magnetic declination for the contiguous United States is shownin Figure 8.1-1.Declination angles are always subtracted from the compass reading to findTrue North. A declination angle East of True North is reported as positive avalue and is subtracted from 360 (0) degrees to find True North as shownFigure 8.1-2. A declination angle West of True North is reported as a negativevalue and is also subtracted from 0 (360) degrees to find True North as shownin Figure 8.1-3. Note that when a negative number is subtracted from apositive number, the resulting arithmetic operation is addition.For example, the declination for Longmont, CO is 10.1°, thus True North is360° - 10.1°, or 349.9° as read on a compass. Likewise, the declination for McHenry, IL is -2.6°, and True North is 0° - (-2.6°), or 2.6° as read on a compass.15