Campbell SP-LITE Bedienungsanleitung PDF herunterladen (Seite 16)

SP Lite2 Silicon Pyranometer

6. Maintenance

The SP Lite2 is an ‘all weather’ instrument and is very stable, but should be

handled with care. It requires little periodic maintenance, apart from cleaning

the sensor surfaces carefully with a soft cloth using water or alcohol.

6.1 Calibration

It is recommended that the SP Lite2 is checked, and re-calibrated if necessary,

every two years. The calibration can be checked by running the SP Lite2 in

parallel with a reference sensor for at least two sunny days, and then comparing

the daily readings. The reference sensor should either be a higher standard

pyranometer, or an SP Lite2 that is kept stored and used solely for this purpose.

If results differ by more than 5 percent, the sensor should be returned for re-

calibration. Please contact Campbell Scientific for further details.

7. Troubleshooting

7.1 Pyranometer produces no apparent output

If your pyranometer does not appear to be working at all, do the following

checks:

x With the SP Lite2 disconnected from the datalogger, connect a volt meter

to the Red (+) and Blue (-) wires. The voltage range should be ~ 0-120

mV for 0-1100 W m

-2

radiation.

x If this appears to produce no results, measure the impedance of the sensor

across the Red and Blue wires. The impedance reading should be less than

0. If it is less than , a short circuit is indicated. If it is ‘infinite’, the

sensor is damaged, or the cable is broken.

7.2 Readings are not as expected

x Under full sunlight the expected radiation value is about 1000 W m

-2

x Verify that the multiplier parameter in the measurement instruction is

correct for the desired units (e.g., W m

-2

, see Section 5 above).

x Check the datalogger program for errors.

If you cannot resolve your problems, please contact Campbell Scientific for

further advice.

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Campbell SP-LITE Bedienungsanleitung Seite 16