Campbell CVF4 Especificações descarregar pdf (Página 11)

CNR4 Net Radiometer

2.3 Pyrgeometer Specifications

Spectral range:

4.5 μm to 42 μm (50% points)

Sensitivity:

5 to 15 μV/W/m

Impedance:

20 Ω to 200 Ω (typically 50)

Response time:

< 18 seconds (95% response)

Non-linearity:

< 1% (-250 to +250 W/m

irradiance)

Temperature dependence of

sensitivity:

< 4% (-10° to +40°C)

Tilt error:

< 1% (deviation when tilted at any

angle off horizontal)

Zero offset due to temperature

change:

±4 W/m

(5K/hr temperature change)

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

2.4 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.

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