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Campbell CS805 Instruction Manual

Heated-needle anemometer
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CS805 Heated-Needle
Anemometer
6/02
C o p y r i g h t
( c )
2 0 0 2
C a m p b e l l
S c i e n t i f i c ,
I n c .

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  • Page 1 CS805 Heated-Needle Anemometer 6/02 C o p y r i g h t ( c ) 2 0 0 2 C a m p b e l l S c i e n t i f i c , I n c .
  • Page 2 Warranty and Assistance The CS805 HEATED-NEEDLE ANEMOMETER 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...

  • Page 3: Table Of Contents

    A.2 Conductive Heat Transport across the Boundary Layer.......A-1 A.3 Reference .....................A-3 Figures 1. Angular Response of CS805 ...............2 2. Pressure and Elevation................3 3. Plane of Calibrated Sensitivity..............5 4. CS805, Sensor and Wiring Figure ..............6 A-1. Changes in K with Temperature and Humidity ........A-2...
  • Page 4 This is a blank page.

  • Page 5: General Description

    CS805-L indicates that the cable length is user specified. This manual refers to the sensor as the CS805 and applies to the CS805-L as well. The CS805 is meant for use with a current source, such as the CE805,...

  • Page 6: Calibration And System Accuracy

    CS805 Heated-Needle Anemometer 3. Calibration and System Accuracy As listed in the previous section, the CS805 has been calibrated and tested in a controlled environment at 25°C, 646 mmHg (861 mbar, 0.85 atm), and 31.100 mA of constant current. This sensor is going to be exposed to many applications deviating from the calibration environment, and will continue to work well.

  • Page 7: Pressure Change With Elevation

    3.2 Pressure Change with Elevation FIGURE 2. Atmospheric Pressure Change with Elevation The calibration of the CS805 took place in Logan, Utah, at an elevation of 1.384 km (4500 ft.) above sea level. Unless the sensor is being used at this elevation, the calibration will need to be adjusted for a pressure change due to elevation.
  • Page 8 CS805 Heated-Needle Anemometer Changes in the current delivered to the CS805 will directly contribute to the error of the wind speed measurement. When the CS805 is being used with the CE805 at a temperature different from 25°C the inaccuracy of the current delivery will alter the measurement.
  • Page 9 Secondly, the differential temperature of the CS805 needs to be referenced to a separate air temperature measurement. This separate measurement needs to be made in a vicinity representative of the air temperature at the CS805. This can be done with any method of temperature measurement, such as a 107 probe or thermocouple.

  • Page 10: Wiring

    Black Shield - Clear FIGURE 4. CS805, Sensor and Wiring Figure Below is listed the wiring needed for your CS805/CE805/Datalogger system. The wiring between the CE805 and the Datalogger is not provided by Campbell Scientific. CR7, 21 X, CR23X CE805...

  • Page 11: Example Programs

    (continually powered; time series ~1 or 2 s with 107 probe) ;{CR10X} ; This program is written to work with the CS805, ; being used in conjunction with the CE805 and a ; CS107 temperature probe as an air temperture ;...
  • Page 12 1: 41 Set Port 1 High ; Note: ; The CS805 takes about 15 seconds to settle ; upon inital power up. The first 15 measurement ; are not going to be correct. ; Set Flag 1 High, not to enter the IF again.
  • Page 13 CS805 Heated-Needle Anemometer ; Begin working through the calibration adjustments 8: Z=1/X (P42) 1: 3 X Loc [ delta_T ] 2: 4 Z Loc [ Inv_dT ] ; Slope adjustment 9: Z=X*F (P37) 1: 4 X Loc [ Inv_dT ] 2: 255.1...
  • Page 14 CS805 Heated-Needle Anemometer 16: Sample (P70)^11916 1: 1 Reps 2: 5 Loc [ wnd_spd ] *Table 2 Program 02: 0.0000 Execution Interval (seconds) *Table 3 Subroutines ; Subroutine 2 will make the adjustment ; multiplier for pressure, and store ; it in an input location.
  • Page 15 Example 2. CR10X Program (with delay; with average; with 107 probe) ;{CR10X} ; This program is written to work with the CS805, ; being used in conjunction with the CE805 and a ; CS107 temperature probe as an air temperture ;...
  • Page 16 CS805 Heated-Needle Anemometer 4: Do (P86) 1: 51 Set Port 1 Low ; Begin processing the measurement for wind speed ; The measurement made above has been referenced ; to air temperature. The way the datalogger ; works adds the reference on to the temperature ;...
  • Page 17 ; Set Control Port 1 High to trigger CE805 2: Do (P86) 1: 41 Set Port 1 High ; Note: ; The CS805 takes about 15 seconds to warm ; up upon initial power up. 3: Excitation with Delay (P22) 1: 1 Ex Channel 2: 0 Delay W/Ex (0.01 sec units)
  • Page 18 CS805 Heated-Needle Anemometer 6: Do (P86) 1: 12 Set Flag 2 High ; The adjustment will be from calibration ; pressure of .85 atm to a use pressure ; of 1 atm. 7: Z=F x 10^n (P30) 1: 0.85 2: 0...
  • Page 19 StdDev(1,wind(1), ieee4, false) 'std. dev on the wind speed EndTable BeginProg 'As we begin the program, trigger the CS805 to stay on 'after it scans it will stay High the rest of the program Scan(1,mSec,1, 1) Portset(1,1) 'Trigger with port 1 High...
  • Page 20 CS805 Heated-Needle Anemometer 'Process for the sqr. root of wind speed wind= wind * wind 'Call the table for final storage CallTable wind NextScan EndProg...

  • Page 21: Pressure Validation

    This sensor works primarily on the theory of convective heat transport. However, before the heat is convected away in the moving air stream, it is conducted across the boundary layer. The geometry of the CS805 forces conductive transport across the boundary layer because it remains in a state of laminar flow at all wind speeds.
  • Page 22 Although boundary layer changes slightly with pressure (changes), the primary contribution to the change in boundary layer thickness is wind speed. For the CS805, the boundary layer changes from 0.8-0.08 mm over the range of the sensor. The change in temperature gradient is affected much more by wind speed than pressure, temperature, and humidity.
  • Page 23 Within the temperature ranges of most applications, this change will generally not be a concern, relative to the accuracy of the CS805. However, if operating in an environment with temperature extremes, the correction may want to be applied.
  • Page 24 Appendix A. Secondary Error Considerations This is a blank page.
  • Page 25 This is a blank page.
  • Page 26 Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com info@campbellsci.com Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za sales@csafrica.co.za Campbell Scientific Australia Pty. Ltd. (CSA)

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