Campbell SP-LITE Bedienungsanleitung PDF herunterladen (Seite 5)

SP Lite2 Silicon Pyranometer

The SP Lite2 measures incoming solar radiation (sun plus sky radiation) with a photodiode

detector. Output from the photodiode is a current, which is converted to voltage by an

internal shunt resistor. The SP Lite2 can be used in solar energy applications such as

plant growth, thermal convection and evapotranspiration.

1. General Description

FIGURE 1. SP Lite2 Sensor with Leveling Instrument

The SP Lite2 is used for measuring solar radiation. It measures the solar

energy received from the entire hemisphere – i.e. 18qfield of view. The

output is expressed in Watts per square meter (W m

-2

The SP Lite2 is designed for continuous outside use, and its calibration is valid

only for unshaded natural daylight – not for artificial light. It is most usually

used to measure solar radiation being received on the horizontal plane.

However, the SP Lite2 can, if required, be used in an inverted or tilted position.

1.1 Electrical Properties

The SP Lite2 consists of a photodiode complete with housing and cable. The

circuit includes a shunt resistor for the photodiode in order to generate a

voltage output. The electrical specification of the sensor is determined by the

characteristics of the photodiode and resistor. The electrical circuit of the

pyranometer is shown in Figure 2, below.

The electrical sensitivity of the photodiode changes with temperature. A

nominal value for this change is 0.15% change per °C. Calibration is carried

out at 20 °C.

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Campbell SP-LITE Bedienungsanleitung Seite 5