Vaisala PTB210 SERIES Manuel d'instructions Page 23

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2.1.6 Pressure - Vaisala PTB210
Function
The pressure measurement requires high accuracy and precision to calculate volume
mixing ratio of the measured trace gases. These data are also measured to be
archieved with the solar spectrum in the database of the TCCON network for further
processing. Thus, the automatic weather station is equipped with two digital Vaisala
PTB 210 which features digital output in an range of 500 to 1100 hPa. A third sensor
of the same type is used for the leap-frog recalibration scheme. All of them are
operating in a wide temperature range and the rugged corrosion-resistant housing
provides an IP65 standardized protection against sprayed water.
Figure 2.11: Vaisala PTB 210
[Manual - PTB210 Digital Series with Serial Output, 12/05]
To maintain the reliability of the system the leap-frog recalibration scheme is carried
out according to figure 2.12.
Figure 2.12: Leap-Frog Recalibration Scheme
The sensor is shown in Fig. 2.11. Two barometers are always used for operational
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