Campbell CVF4 Manual de instrucciones descargar pdf (Pagina 13)

CMP6-L, CMP10-L, CMP11-L, and CMP21-L Pyranometers

5. Overview

5.1 Models

CMP-series models differ in accuracy and performance. See Section 6,

Specifications. The CMP21 also includes an internal thermistor allowing

individually optimized compensation of the measurements. The –L portion of

the model number indicates that the pyranometer has a user-specified cable

length. The pyranometers have several cable termination options. Their cables

can terminate in:

x Pigtails that connect directly to a Campbell Scientific datalogger

(cable termination option –PT).

x Connector that attaches to a prewired enclosure (cable termination

option –PW).

x Connector that attaches to a CWS900 Wireless Sensor Interface (cable

termination option –CWS). The CWS900 enables the pyranometer to

be used in a wireless sensor network. Please note that this option is

not available for the CMP21.

5.2 Construction

The pyranometers consist of a thermopile sensor, housing, two glass domes,

and cable. The thermopile is coated with a black absorbent coating. The paint

absorbs the radiation and converts it to heat. The resultant temperature

difference is converted to a voltage by the copper-constantan thermopile. The

thermopile is encapsulated in the housing in such a way that it has a field of

view of 180 degrees and the angular characteristics needed to fulfill the cosine

response requirements.

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Campbell CVF4 Manual de instrucciones Pagina 13