Campbell CNR4 Manuál s instrukcemi stáhnout pdf (Strana 22)

CNR4 Net Radiometer

Field of view

Upper:

Lower:

180 degrees

150 degrees

Net-irradiance:

–250 to +250 W/m

Non-stability:

< 1% (sensitivity change per year)

Window heating offset:

< 6 W/m

(1000 W/m

solar

irradiance)

Uncertainty in daily total:

< 10% (95% confidence level) indoor

calibration

Typical signal output for

atmospheric application:

±5 mV

Temperature sensors

Thermistor:

10k Ω

Pt-100:

DIN class A

Instrument calibration:

Indoors, side by side against reference

CG(R) 3 pyrgeometer. On request

outdoors, side by side against

reference CG(R) 4 pyrgeometer

6.4 Optional CNF4 Heater/Ventilator

The purpose of the heater/ventilator is to prevent dew deposition on the

pyrgeometer and pyrgeometer window, thus enhancing the measurement

accuracy and reliability. Using the heater/ventilator will have negligible effect

on the pyranometer reading.

Generally, the errors caused by the heater/ventilator will be small relative to the

errors that would have been caused by water deposition.

6.4.1 CNF4 Specifications

Heater

Power consumption:

10 W @ 12 Vdc (15 Ω)

Ventilator

Power consumption:

Supply voltage:

5 W @ 12 Vdc

8 to 13.5 Vdc

Weight without cable:

0.5 kg (1.11 lb)

Operating temperature:

–40 to 80 °C

7. Operation

If you are programming your datalogger with Short Cut, skip Section 7.2,

Wiring, and Section 7.3, Datalogger Programming. Short Cut does this work

for you. See Section 4.3, Short Cut Programming, for a tutorial.

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