Campbell Scientific CS300 CS300 Silicon Pyranometer - Page 9

CS300 Pyranometer Solar radiation can be recorded as an average flux density (W m-2) or daily total flux density (MJ m-2). The appropriate multipliers are listed in Table 5-1. Negative values should be set to zero before being processed. TABLE 5-1. Multipliers Required for Average Flux and Total Flux Density in SI and English Units UNITS W m-2 MJ m-2 kJ m-2 cal cm-2 min-1 cal cm-2 MULTIPLIER 5.0 t * 0.000005 t * 0.005 0.005 * (1.434) t * 0.005 * (0.0239) PROCESS Average Total Total Average Total t = datalogger execution interval in seconds 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. 5.1 Example Programs The following programs measure the CS300 every 10 seconds and convert the mV output to Wm-2 and MJm-2. Both programs output an hourly average flux (Wm-2), and a daily total flux density (MJm-2). Negative values are set to zero before being processed. Wiring for the examples is given in Table 5-2. TABLE 5-2. Wiring for Example Programs Color Red Black Clear Description Signal Signal Ground Shield CR1000 SE 1 CR10X SE 1 AG G 5.1.1 CR1000 Example Program 'CR1000 'Declare Variables and Units Public SlrW Public SlrMJ Units SlrW=W/m² Units SlrMJ=MJ/m² 5