User manual VAISALA AWS330

[. . . ] USER'S GUIDE Vaisala Automatic Weather Station AWS330 M211296EN-A PUBLISHED BY Vaisala Oyj P. O. Box 26 FI-00421 Helsinki Finland Phone (int. ): +358 9 8949 1 Fax: +358 9 8949 2227 Visit our Internet pages at www. vaisala. com. © Vaisala 2011 No part of this manual may be reproduced in any form or by any means, electronic or mechanical (including photocopying), nor may its contents be communicated to a third party without prior written permission of the copyright holder. The contents are subject to change without prior notice. [. . . ] If support for Telnet escape sequences for binary file transfer is required, select the Telnet option. Save your settings and return to the Address Book window by selecting Save. Dial-Up Connections The dial-up connections are based on Windows Dial-Up Networking entries, so you first need to create the connection in Windows. For information on creating Windows Dial-Up Networking connections, please see the Windows online help. To add an Address Book entry for the dial-up connection, proceed as follows: 1. On the Settings menu, select Address Book. The fields for selecting new connection parameters are displayed. From the Type list, first select Socket. The field for selecting Windows Dial-Up Networking entries is available in the window shown in Figure 85 on page 143. 142 _________________________________________________________________ M211296EN-A Chapter 5 __________________________________________ Software Configuration and Operation 1101-024 Figure 85 4. 5. Creating Dial-Up Connection Address Book Entry 6. In the Name field, enter an alphanumeric string that uniquely identifies the connection you are creating in the Address Book. If you have multiple QML loggers on the same network and you are going to access them over the same dial-up connection, you need a unique identifier for each logger. To uniquely identify the logger for which you are creating an Address Book entry, enter a unique alphanumeric string in the Station id field. However, if you only have a single logger on the network, you can leave the Station id entry blank. In the Command wait timeout (ms) field, enter a value in milliseconds that specifies for how long AWS Client will wait for the logger to respond when AWS Client sends a requests over the dial-up connection. If the request, for instance, a log file download, succeeds within the timeout, a success message is displayed. If the request fails, a failure message is displayed instead, and you have the option to try again at a later time. Factors such as the current load on the logger, delays in the connection, and the response length affect whether or not the timeout will expire during a request. In case the system has a large amount of static parameters, VAISALA ______________________________________________________________________ 143 User's Guide ______________________________________________________________________ 7. 8. the set static parameters command can require a long command wait timeout. From the Dial-up modem entry pull-down menu, select an ISP Name, that is, the Windows Dial-up Networking entry that you created as a prerequisite for this address book entry. Save your settings and return to the Address Book window by selecting Save. Options Window The Options window contains general settings for AWS Client. To open the window, select Options on the Settings menu. The Options window, shown in Figure 86 below, contains the items listed in Table 37 on page 145. 0905-011 Figure 86 Options Window 144 _________________________________________________________________ M211296EN-A Chapter 5 __________________________________________ Software Configuration and Operation Table 37 Setting Locale Settings in AWS Client Options Window Description User interface language used in AWS Client. If AWS Client has not been localized for the selected language, the user interface will remain in English. [. . . ] The evapotranspiration calculation estimates the loss of water from a vegetative surface trough the combined process of plant transpiration and soil evaporation. It is calculated with the following formula: 0. 408( Rn G ) 900 U 2 (e a e d ) T 273 (1 0. 34U 2 ) Eto where Eto Rn G T U2 (ea-ed) = = = = = = = = Reference crop evapotranspiration [mm/d] Net radiation at crop surface [MJ/m2/d] Soil heat flux [MJ/m2/d] Average air temperature [C] Wind speed measured at 2m height [m/s] Vapor pressure deficit [kPa] Slope of vapor pressure curve [kPa(C)] Psychometric constant [kPa(C)] Slope of the Vapor Pressure Curve () 4098ea (T 237. 3) 2 Net Radiation (Rn) This is the average radiation from sensor. The radiation value [W/m2] from measurements is converted to [MJ/m2/d] by the calculation. VAISALA ______________________________________________________________________ 285 User's Guide ______________________________________________________________________ Soil Heat Flux (G) T Tn 1 G cs d s n t where Tn Tn-1 t cs ds = = = = = Temperature on day n [C] Temperature on preceding day n-1 [C] Time period [days] Volumetric heat capacity [MJ m-3 C-1] (2. 1 for average moist soil is used) Estimated effective soil depth [m] (0. 2 m is used) Psychometric Constant () CpP 10 3 0. 00163 P where Cp P = = = = = Psychometric constant [kPa C-1] Specific heat of moist air = 1. 013 kJ kg-1 C-1 Atmospheric pressure [kPa] Ratio molecular weight water vapor/dry air = 0. 622 Latent heat of vaporization [ML kg-1] is given by the following formula: 2. 501 (2. 361 10 3 )T Average Air Temperature (T) Where hourly data is available: T i 0 24 Ti 24 286 _________________________________________________________________ M211296EN-A Appendix B ______________________________________________________ Calculation Formulas Wind Speed (U2) Estimate wind speed at 2 m height when measured at height z. 4, 87 U2 Uz ln((67. 8 z ) 5. 42) where Uz z = = Wind speed measured at height z [ms-1] Height of wind speed measurement [m] Vapor Pressure Deficit (ea-ed) e (T ) ea (Tmin ) VPD (ea ed ) a max ed 2 where ea ed = = Saturation vapor pressure [kPa] Actual vapor pressure [kPa] 17. 27Tmax ea (Tmax ) 0. 611 exp T 237. 3 max 17. 27Tmin ea (Tmin ) 0. 611 exp T 237. 3 min RH max 1 ed ea (Tmin ) 100 2 where Tmax Tmin ea(Tmax) ea(Tmin) ed(Tmax) ed(Tmin) RHmax RHmin = = = = = = = = RH min 1 ea (Tmax ) 100 2 Maximum daily temperature [C] Minimum daily temperature [C] Saturation vapor pressure at Tmax Saturation vapor pressure at Tmin Actual vapor pressure at Tmax Actual vapor pressure at Tmin Maximum daily relative humidity [%] Minimum daily relative humidity [%] VAISALA ______________________________________________________________________ 287 User's Guide ______________________________________________________________________ Table 118 Inputs for Evapotranspiration Calculation Variable(s) GIRRAVG1D; see Table 9 on page 25 Station parameter 'evap_albedo'; see Table 22 on page 117 Daily statistical values derived from TAAVG1M; see Table 4 on page 22 Daily statistical values derived from RHAVG1M; see Table 4 on page 22 Daily average of WSAVG2M; see Table 6 on page 24. 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