Campbell Bowen Ratio Instrumentation, Instruction Manual

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Bowen Ratio Table of Contents 

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1.  System Overview ......................................................1-1 

1.1  Review of Theory ................................................................................. 1-1 
1.2  System Description ............................................................................... 1-3 

1.2.1  Water Vapor Measurement ......................................................... 1-3 
1.2.2  Air Temperature Measurement ................................................... 1-4 
1.2.3  Net Radiation and Soil Heat Flux ............................................... 1-5 
1.2.4  Power Supply .............................................................................. 1-5 

2.  Station Installation....................................................2-1 

2.1  Sensor Height and Separation............................................................... 2-1 
2.2  Soil Thermocouples and Heat Flux Plates ............................................ 2-2 
2.3  Wiring................................................................................................... 2-4 
2.4  Battery Connections.............................................................................. 2-7 
2.5  System Startup ...................................................................................... 2-7 
2.6  Routine Maintenance ............................................................................ 2-7 
2.7  Cleaning the DEW 10........................................................................... 2-8 

3.  Sample CR23X Program...........................................3-1 

4.  Calculating Fluxes Using SPLIT ..............................4-1 

4.1 Data Handling........................................................................................ 4-1 
4.2  Calculating Fluxes ................................................................................ 4-1 

Appendices 

A.  References............................................................... A-1 

B.  023 Bowen Ratio (Pre July 1993) ........................... B-1 

Tables 

1.2-1.  Component Power Requirements ..................................................... 1-5 
2.3-1.  CR23X/Sensor Connections for Example Program ......................... 2-4 
3-1.  Sample CR23X Bowen Ratio Program Flow Chart ............................ 3-2 
3-2.  Output From Example Bowen Ratio Program .................................... 3-5 
4.2-1.  Input Values for Flux Calculations .................................................. 4-3