KH20 Krypton Hygrometer
2
the CSAT3B 3-D sonic anemometer for measuring latent heat flux (LE), using
eddy-covariance technique.
The KH20 sensor uses a krypton lamp that emits two absorption lines: major
line at 123.58 nm and minor line at 116.49 nm. Both lines are absorbed by
water vapor, and a small amount of the minor line is absorbed by oxygen. The
KH20 is not suitable for absolute water vapor concentration measurements due
to its signal offset drift.
The KH20 heads are sealed and will not suffer damage should they get wet. In
addition, the electronics box and the connectors are housed inside a rain shield
that protects them from moisture. The KH20 is suitable for long-term
continuous outdoor applications.
The KH20 sensor is comprised of two main parts: the sensor head and the
electronics box. The sensor head comes with cables that connect the sensor to
the electronics, a power/signal cable, and mounting hardware.
Discussion on the principles and theory of measurement is
included in Appendix
(p. A-1)
Features:
•
High frequency response suitable for eddy-covariance applications
•
Well-suited for long-term, unattended applications
•
Compatible with Campbell Scientific CRBasic data loggers: CR6,
CR3000, CR1000X, CR800 Series, CR1000, CR5000, and
CR9000(X)
5. Specifications
5.1 Measurements
Calibration Range:
1.7 to 19.5 g/m
3
(nominal)
Frequency Response:
100 Hz
Operating Temperature Range:
–30 to 50 °C
5.2 Electrical
Supply Voltage:
10 V to 16 VDC
Current Consumption:
20 mA max at 12 VDC
Power Consumption:
0.24 Watts
Output Signal Range:
0 to 5 VDC
5.3 Physical
Dimensions
Sensor Head:
29 x 23 x 3 cm (11.5 x 9 x 1.25 in)
Electronics Box:
19 x 13 x 5 cm (7.5 x 5 x 2 in)
Rain Shield with Mount:
29 x 18 x 6.5 cm (11.5 x 7 x 2.5 in)
Mounting Pipe:
50 cm (20 in)
Carrying Case:
64 x 38 x 18 cm (25 x 15 x 7 in)
NOTE
