Campbell Scientific TDR Probes CS605, CS610, CS630, CS635, CS640, CS645 - Manual (Page 8)

TDR Probes CS605, CS610, CS630, CS635, CS640, CS645
as a change in probe impedance which affects the shape of the reflection. The
shape of the reflection contains information used to determine water content
and soil bulk electrical conductivity.
5. Specifications
5.1 Physical Description
TABLE 5-1. TDR Probe Physical Properties
Probe
Model Rods Probe Head Cable Type
Maximum Soil
Bulk Electrical
Conductivity
Maximum
Cable Length
(measured from
the tips of the
probe’s rods to
the TDR100
Reflectometer)
CS605 length 30.0
cm
diameter 0.475 cm
length 10.8 cm
width 7.0 cm
thickness 1.9 cm
RG58
1.4 dS/m 15 m
CS610 length 30.0 cm
diameter 0.475 cm
length 10.8 cm
width 7.0 cm
thickness 1.9 cm
RG8
low loss 1.4 dS/m 25 m
CS630 length 15.0 cm
diameter 0.318 cm
length 5.75 cm
width 4.0 cm
thickness 1.25 cm
RG58
3.5 dS/m 15 m
CS635 length 15.0 cm
diameter 0.318 cm
length 5.75 cm
width 4.0 cm
thickness 1.25 cm
LMR-200
low loss 3.5 dS/m 25 m
CS640 length 7.5 cm
diameter 0.159 cm
length 4.5 cm
width 2.2 cm
thickness 1.0 cm
RG58
5.0 dS/m 15 m
CS645 length 7.5 cm
diameter 0.159 cm
length 4.5 cm
width 2.2 cm
thickness 1.0 cm
LMR-200
low loss 5.0 dS/m 25 m
5.2 Measurement Parameters
TABLE 5-2. TDR Probe Measurement Properties
Probe Model
Probe Offset
(meters)
Probe Constant for Electrical
Conductivity (EC) Measurement, Kp
(using this constant will provide EC in
siemens/meter)
CS605 and CS610 0.090 1.74
CS630 and CS635 0.052 3.36
CS640 and CS645 0.035 6.40
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