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KH20 Krypton Hygrometer - Page 2
... KH20 KRYPTON HYGROMETER is warranted by Campbell Scientific, Inc. products which Campbell Scientific company...problem, an RMA number will be either emailed to repair@campbellsci.com or faxed to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) defective products. will not process any CAMPBELL SCIENTIFIC, INC. This warranty is :
CAMPBELL SCIENTIFIC, INC. CAMPBELL SCIENTIFIC...
KH20 Krypton Hygrometer - Page 3
...Installation 2
3.1 Siting...2 3.2 Mounting 2
3.2.1 Parts and Tools Needed for links to Measure Water Vapor Fluctuations......7
6. Proper mounting position of KH20 A-1
Figures
1. Attaching cables to the printed version of KH20 10 6.5 Older KH20.... Mounting KH20 onto a tripod 3 2. Datalogger Programming 6
5.1 KH20 Calibration 6 5.2 Example 1, CR3000 Program to specific sections.
...
KH20 Krypton Hygrometer - Page 5
... customer can order a replacement cable (p/n KH20CBL-L) and specify the desired lead length after -L.
It is included in the air.
Please refer to its signal offset drift. The KH20 is suitable for absolute water vapor concentration measurements due to the Open Path Eddy Covariance System operator's manual for mounting. The KH20 is not suitable for...
KH20 Krypton Hygrometer - Page 6
...) 5. Tripod (CSI model CM115 standard) or tower 2. KH20 Krypton Hygrometer
2.3 Physical
3. Small Phillips and flat-head screw-drivers 6. 1/2 inch wrench
2 Please refer to Section 2 Installation and Mounting of cables
...)
Package Includes:
KH20 sensor head with 5' of the Open Path Eddy Covariance System manual for more discussion on siting.
3.2 Mounting
3.2.1 Parts and Tools Needed for...
KH20 Krypton Hygrometer - Page 7
...the rain shield to a mast with the front cover on top, as shown in Figure 1. Mounting KH20 onto a tripod.
3.2.3 Mounting the Electronics Box
Mount the electronics box as follows:
1. Attach the 20... inch long mounting boom to a crossarm via 1" x 3/4" Nu-rail (CSI p/n 1049).
4. Mount the KH20 such that the source tube, the longer of the rain shield, and then pushing the cover all the way ...
KH20 Krypton Hygrometer - Page 8
... positioned at the bottom of the electronics box, as the U-bolt for the rain shield will be within 5 feet so that the distance between the KH20 sensor head and the rain shield is not pushed all the way up during mounting, you will not have enough room to attach the connectors...
KH20 Krypton Hygrometer - Page 9
... and tighten the two pan-head screws to the electronics box.
5. FIGURE 3. Wiring
The KH20 sensor is mounted at a highest possible position (see Figure 3). Black (from Red/Black set)
Shield *Jumper to the CR1000, CR3000, and CR5000.
TABLE 1. KH20 Krypton Hygrometer
4.
Connect the three cables to the bottom of the electronics box around...
KH20 Krypton Hygrometer - Page 10
...signal. TABLE 2. KH20 Krypton Hygrometer
5. Once the decision is made :
• Will the windows be measured using that for a specific KH20. The water ...KH20 vapor ranges over a vapor range of the site is unknown, or if the vapor range is appropriate for three different vapor ranges are calculated. See Appendix A for more accurate measurements than using the VoltDiff instruction...
KH20 Krypton Hygrometer - Page 12
...
'Measure battery voltage. VoltDiff (kh_mV,1,mV5000,1,TRUE,200,250,1,0)
ln_kh = LOG(kh_mV) rho_w = ln_kh/xkw
CallTable stats CallTable ts_data
NextScan EndProg
8 Battery (batt_volt)
'Measure KH20. KH20 Krypton Hygrometer
'*** Variables *** Public panel_temp Public batt_volt Public kh(2) Public rho_w Alias kh(1) = kh_mV Alias kh (2) = ln_kh Units panel_temp = deg_C Units batt_volt = volts Units...
KH20 Krypton Hygrometer - Page 13
...tube to make sure the UV light is emitted from KH20 is the longer of around 5 mA or less indicates the problem on the KH20
Typical current drain for repair. and send the unit in question, perform the following ...Inspection
• Make sure the optical windows are protected from Campbell Scientific, Inc.
If you see a faint or flickering blue light, perform the following test.
KH20 Krypton Hygrometer - Page 14
...small. To see an immediate decrease in for repair.
6.4 Managing the Scaling of the atmospheric humidity. The ...Campbell Scientific, Inc. Thus, water vapor fluctuation measurements can clean it across the window to corrosion and loss of the KH20... problem in the voltage reading takes place but noticeable resistance while you can still be recalibrated every two years. KH20 Krypton...
KH20 Krypton Hygrometer - Page 15
... follows, where kw is the absorption coefficient for water vapor, x is the path length for the KH20 sensor, and ρw is to the Beer's law, the log of the transmissivity is a linear... at 123.58 nm and the minor line at 116.49. Appendix A. Calibrating KH20
A.1 Basic Measurement Theory
The KH20 uses an empirical relationship between the natural log of the equation A-4 after passing through...
KH20 Krypton Hygrometer - Page 16
..., that is appropriate for the full range. KH20 ln(mV) vs. Again the slope is on the plot above will be the coefficient, kwx which we can perform the linear regression on the border line between the ln(mV) and the vapor density. Campbell Scientific, Inc. We then break up the vapor density...
KH20 Krypton Hygrometer - Page 17
TABLE A-2. Final Calibration Values for KH20
Full Range Dry Range Wet Range
Vapor Range (g/m3)
1.74 ~ 19.25
1.74 ~ 9.20
7.95 ~ 19.25
Slope (xkw) -0.205 -0.216
-0.201
Y Intercept ln (V0) 3087 3259
2899
Coefficient (kw) -0.144 -0.151
-0.141
A-3
Appendix A. Calibrating KH20
the KH20 calibration certificate contains. The data shown in Table A-2 is from an actual KH20.
KH20 Krypton Hygrometer - Page 18
Calibrating KH20 A-4 Appendix A.
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