Campbell NR01, Инструкция по эксплуатации

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NR01 Four-Component Net Radiation Sensor
19
TABLE 7-4. Expected NR01 Outputs
D / N CD / CR
Ambient
air temp.
pyrgeo
down #
pyrgeo
up #
pyrano
down
pyrano
up T
sky
T
ground
°C W/m 2 W/m 2 W/m 2 W/m 2 °C °C
D CD +20 0 0 0 to 500 0 to 150 20 +20
D CD –20 0 0 0 to 500 0 to 150 –20 –20
D CR +20 –70** 0 0 to 1500 0 to 400 +1 +20
D CR –20 –70** 0 0 to 1500 0 to 400 –50 –20
N CD +20 0 0 0 0 +20 +20
N CD –20 0 0 0 0 –20 –20
N CR +20 –70* 0 0*** 0 1 +20
N CR –20 –70* 0 0*** 0 50 –20
# Outputs listed for both of the pyrgeometers are not compensated for sensor temperature. For example, to
correct for sensor temperature when the sensor temperature is 14 °C, you should add 385 W/m 2 to the
pyrgeometer signals.
*At night, dew deposition may affect the downward facing pyrgeometer’s output. In that case, the signal may
drop to 0 W/m 2 , producing a maximum error of +100 W/m 2 . Campbell Scientific recommends activating the
heater to avoid dew deposition.
**During the day, the window-heating offset may affect the downward facing pyrgeometer’s output. This can
produce a maximum error of +15 W/m
2
.
***At night, the infrared offset may affect the downward facing pyranometer’s output. The maximum error of
this offset is -25 W/m
2
.
8. Maintenance and Troubleshooting
8.1 Maintenance
The NR01 requires little maintenance. Dirt should be cleaned off the domes
every few weeks. Usually errors in functionality appear as unreasonably large
or small measured values. See TABLE 8-1 for specific maintenance
recommendations.
TABLE 8-1. Maintenance Recommendations
Critical review of data
Cleaning of dome using water or alcohol every few weeks
Inspection of dome interior; no condensation every few weeks
Inspection of cables for open connections every few weeks
Perform the procedure provided in Section
6.7 ,
Instrument-Inversion Test
(p. 13)
.
Recalibration: suggested every 2 years, typically by intercomparison with a
higher standard in the field.