Campbell-scientific AP200 CO2/H2O Atmospheric Profile System Instrukcja Użytkownika Pobierz pdf (Strona 26)

AP200 CO

O Atmospheric Profile System

100

105

0 500 1000 1500 2000 2500 3000

Elevation (m)

Ambient Pressure (kPa)

FIGURE 4-19. Nominal ambient pressure as related to increasing

elevation

FIGURE 4-20 shows the nominal sample flow as a function of ambient

pressure, assuming a 35-kPa pressure drop across the orifice.

180

190

200

210

220

230

240

250

70 75 80 85 90 95 100

Ambient Pressure (kPa)

Sample Flow (ml/min)

FIGURE 4-20. Nominal sample flow rate as related to increasing

ambient pressure

Taken together, these two graphs show that the nominal flow varies from 247

ml/min at sea level to 180 ml/min at 3000 m. The flow rate is reported in

public variable sample_flow. Some variation in flow (approximately 10%) is

to be expected due to variation in the actual size of the orifices and in the

calibration of the flow sensor. For example, at an elevation of 1000 m, the

nominal ambient pressure is 90 kPa, which gives a nominal flow of 225

ml/min. The normal expected range for the flow would be from ~200 to ~250

ml/min.

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Campbell-scientific AP200 CO2/H2O Atmospheric Profile System Instrukcja Użytkownika Strona 26