Campbell Scientific LI200X LI200X-L LI-COR Silicon Pyranometer - Page 10

LI200X Pyranometer TABLE 4-1. Multipliers Required for Average Flux and Total Flux Density in Sl and English Units UNITS W m-2 MJ m-2 kJ m-2 cal cm-2 min-1 cal cm-2 MULTIPLIER 200 t * 0.0002 t * 0.2 0.2 * (1.434) t * 0.2 * (0.0239) PROCESS Average Total Total Average Total t = datalogger execution interval in seconds 4.1 Example Programs The following programs measure the LI200X 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 4-2. TABLE 4-2. Wiring for Example Programs Color Red Black White Clear Description Signal Signal Reference Signal Ground Shield CR1000 1H 1L CR10X 1H 1L AG G 4.1.1 CR1000 Example Program In the CR1000 example, a daily total flux density is found. This total flux density is in MJ m-2 day-1. Negative values are set to zero before they are added to the running total. 'CR1000 'Declare Variables and Units Public SlrW Public SlrMJ Units SlrW=W/m² Units SlrMJ=MJ/m² 6