Specifications; Measurements; Electrical; Physical - Campbell KH20 Product Manual

NOTE
5.

Specifications

5.1

Measurements

5.2

Electrical

5.3

Physical

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 A, Calibrating KH20
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)
Calibration Range:
Frequency Response:
Operating Temperature Range:
Supply Voltage:
Current Consumption:
Power Consumption:
Output Signal Range:
Dimensions
Sensor Head:
Electronics Box:
Rain Shield with Mount:
Mounting Pipe:
Carrying Case:
KH20 Krypton Hygrometer
.
(p. A-1)
1.7 to 19.5 g/m 3 (nominal)
100 Hz
–30 to 50 °C
10 V to 16 VDC
20 mA max at 12 VDC
0.24 Watts
0 to 5 VDC
29 x 23 x 3 cm (11.5 x 9 x 1.25 in)
19 x 13 x 5 cm (7.5 x 5 x 2 in)
29 x 18 x 6.5 cm (11.5 x 7 x 2.5 in)
50 cm (20 in)
64 x 38 x 18 cm (25 x 15 x 7 in)
2