INSTRUCTION MANUAL LI200X-LC Pyranometer for MetData1 4/97 C o p y r i g h t ( c ) 1 9 9 4 - 1 9 9 7 C a m p b e l l S c i e n t i f i c , I n c .
Warranty and Assistance The LI200X-LC PYRANOMETER FOR METDATA1 is warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products.
LI200X-LC PYRANOMETER FOR METDATA1 1. GENERAL The LI200X measures incoming solar radiation with a silicon photovoltaic detector mounted in cosine-corrected head. The detector outputs current; a shunt resistor in the sensor cable converts the signal from current to voltage, allowing the LI200X to be measured directly by Campbell Scientific dataloggers. The LI200X is calibrated against an Eppley Precision Spectral Pyranometer to accurately measure sun plus sky radiation.
LI200X-LC PYRANOMETER FOR METDATA1 3. CONNECTION Open Open LI190SB LI200S CS500\HMP45C The LI200X-LC is attached to the MetData1 connector #3. Open the MetData1 internal jumpers #2 and #3 as indicated in Figure 3-1. HMP35C FIGURE 2-1. 015 Pyranometer Mounting Arm #1 #2 #3 #4 Default CS800 FIGURE 3-1. MetData1 Jumper Configuration 4. PROGRAMMING FIGURE 2-2.
LI200X-LC PYRANOMETER FOR METDATA1 TABLE 4-1. Multipliers Required for Average Flux and Total Flux Density in Sl and English Units MULTIPLIER PROCESS -2 200 Average -2 t * 0.0002 Total t * 0.2 Total 0.2 * (1.4333) Average t * 0.2 * (0.02389) Total UNITS Wm MJ m kJ m -2 -2 cal cm min cal cm -1 -2 t = datalogger execution interval in seconds EXAMPLE 1.
LI200X-LC PYRANOMETER FOR METDATA1 07: Average (P71) 1: 1 2: 1* Reps Loc [ W_m2 ] -Input Locations1 W_m2 * Proper entries will vary with program. *** See Table 4-1 for alternative multipliers. 4.2 TOTAL SOLAR RADIATION In Example 2 a daily total flux density is found. -2 -1 This total flux density is in MJ m day . Negative values are set to zero before they are added to the running total. 4.2.
LI200X-LC PYRANOMETER FOR METDATA1 EXAMPLE 2. Sample Instructions used to Measure a Daily Total Flux Density with a CR10(X)/21X ;{CR10X} ; *Table 1 Program 01: 10 01: Volt (Diff) (P2) 1: 1 2: 22 3: 3 4: 1* 5: .002** 6: 0 Execution Interval (seconds) Reps ± 7.5 mV 60 Hz Rejection Range DIFF Channel Loc [ MJ_m2 ] Mult Offset ;Set negative values to zero.
LI200X-LC PYRANOMETER FOR METDATA1 5. MAINTENANCE On a monthly basis the level of the pyranometer should be checked. Any dust or debris on the sensor head should be removed. The debris can be removed with a blast of compressed air or with a soft bristle, camel hair brush. Check that the drain hole next to the surface of the sensor is free of debris. CAUTION: Handle the sensor carefully when cleaning. Be careful not to scratch the surface of the sensor. Recalibrate the LI200X every two years.
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