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PDF CS625 Data sheet ( Hoja de datos )
| Número de pieza | CS625 | |
| Descripción | Water Content Relflectometer | |
| Fabricantes | Campbell Scientic | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CS625 (archivo pdf) en la parte inferior de esta página. Total 4 Páginas | ||
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CS625
Water Content Reflectometer for CR200(X)-Series Loggers
The CS625 Water Content Reflectometer measures
the volumetric water content of porous media using
time-domain measurement methods that are sensitive
to dielectric permittivity. The probe consists of two
30 cm long stainless steel rods connected to a printed
circuit board. The circuit board is encapsulated in ep-
oxy, and a shielded four-conductor cable is connected
to the circuit board to supply power, enable probe, and
monitor the output. The probe rods can be inserted
from the surface or the probe can be buried at any
orientation to the surface.
The CS625 has been developed specifically for the
CR200(X)-series dataloggers and is not compatible
with other dataloggers. Another reflectometer, the
CS616, can be used with a CR510, CR800, CR850,
CR10X, CR1000, CR3000, or CR5000 datalogger.
The CS625 connects directly to one of the datalog-
ger’s single-ended analog inputs. A datalogger con-
trol port is used to enable the CS625 for the amount
of time required to make the measurement. Data-
logger instructions convert the probe square-wave
output to period which is converted to volumetric
water content using a calibration.
Note: A maximum of four CS625 probes can be
measured by one CR200(X) datalogger. Valid chan-
nel options are analog channels 1 through 4.
CS625
The CS625 (bottom) is used
exclusively with the CR200(X)-
series datalogger (top). A maximum
of four CS625 probes can be measured
by one CR200(X) datalogger. Valid chan-
nel options are analog channels 1 through 4.
Reflectometer measurement method
The differentially-driven probe rods form a trans-
mission line with a wave propagation velocity that
is dependent on the dielectric permittivity of the
medium surrounding the rods. Nanosecond rise-
times produce waveform reflections characteristic
of an open-ended transmission line. The return of
the reflection from the ends of the rods triggers a
logic state change which initiates propagation of a
new wavefront. Since water has a dielectric permit-
tivity significantly larger than other soil constitu-
www.DenattasS, hteheet4rUes.cuolmting oscillation frequency is depen-
dent upon the average water content of the medium
surrounding the rods. The megahertz oscillation
frequency is scaled down and easily read by a
Campbell Scientific CR200(X)-series datalogger.
Summary of Measurement
Performance
• probe-to-probe variability: ±0.5% VWC in dry
soil, ±1.5% VWC in typical saturated soil
• accuracy ±2.5% VWC using standard calibration with
bulk electrical conductivity ≤0.5 deciSiemen meter-1
(dS m-1) and bulk density ≤1.55 g cm-3 in measure-
ment range 0% VWC to 50% VWC
• precision 0.1% VWC
• resolution 0.1% VWC
1 page | ||
| Páginas | Total 4 Páginas | |
| PDF Descargar | [ Datasheet CS625.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| CS625 | (CS616 / CS625) Water Content Reflectometers |  Campbell Scientific |
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