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

TABLE 7-4. CMP21 Single-Ended Connections to Campbell Scientific Dataloggers

Wire Color

Wire Label/

Description

CR9000(X),

CR5000, CR3000,

CR1000, CR800

CR510, CR500,

CR10(X)

21X, CR7, CR23X

White

Pyranometer Sig

Single-ended analog

Blue

Pyranometer Ref

Yellow

Thermistor Volt Excite

VX or EX

Black

Thermistor Sig

Single-ended analog

Brown

Thermistor Ref

Clear

Shield

7.3 Programming

This section is for users who write their own datalogger programs.

You do not need to read this section if using Short Cut Program

Generator, or connecting the pyranonmeter to a prewired

enclosure or CWS900 Wireless Sensor Interface. Our prewired

enclosures include a datalogger program. Refer to the Wireless

Sensor Manual for programming information if using a CMP6,

CMP10 or CMP11 with a CWS900.

7.3.1 Solar Radiation Measurement

Solar radiation can be reported as an average flux density (W•m

–2

) or daily

total flux density (MJ•m

–2

). The appropriate multipliers are listed in TABLE

7-5. Programming examples are given for both average and daily total solar

radiation.

The pyranometers output a low level voltage ranging from 0 to a maximum of

up to 20 mV, in natural light, depending on the calibration factor and radiation

level.

This voltage output is measured using either a differential voltage instruction

(VoltDiff() in CRBasic or Instruction 2 (P2) in Edlog) or a single-ended

voltage instruction (VoltSE() in CRBasic or Instruction 1 (P1) in Edlog).

Nearby AC power lines, electric pumps, or motors can be a

source of electrical noise. If the sensor or datalogger is

located in an electrically noisy environment, the

measurement should be made with the 60 or 50 Hz rejection

integration option, as shown in the example programs.

7.3.1.1 Input Range

The output voltage is usually between 5 and 20 mV per 1000 W•m

–2

. When

estimating the maximum likely value of sensor output a maximum value of

solar radiation of 1100 W•m

–2

can be used for field measurements on a

horizontal surface. Plane of array irradiances can exceed 1500 W•m

–2

Note

Caution

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