Campbell Scientific CS650 and CS655 Water Content Reflectometers - Manual (Page 14)

CS650 and CS655 Water Content Reflectometers
CS650 CS655
Volumetric Water
Content using Topp
Equation (m 3 /m 3 )
Range: 5% to 50% 5% to 50%
Accuracy†: ± 3% VWC typical in
mineral soils where
solution EC ≤3 dS/m
± 3% VWC typical in
mineral soils where
solution EC ≤10 dS/m
Precision‡: <0.05% <0.05%
Electrical
Conductivity
Range Solution
EC: 0 to 3 dS/m 0 to 8 dS/m
Range Bulk EC: 0 to 3 dS/m 0 to 8 dS/m
Accuracy†: ± (5% of reading +
0.05 dS/m)
± (5% of reading +
0.05 dS/m)
Precision‡: 0.5% of BEC 0.5% of BEC
Temperature
Soil
Measurement
Range: -10 to + 70°C -10 to + 70°C
Operational
Range: 0 to + 70°C 0 to + 70°C
Accuracy†: ± 0.5°C for probe
body buried in soil
± 0.5°C for probe
body buried in soil
Precision‡: ± 0.02°C ± 0.02°C
Sensing Volume*: 7800 cm 3 3600 cm 3
* Sensing Volume approximately 7.5 cm radius around each probe rod
and 4.5 cm beyond the end of the rods
†Accuracy specifications are based on laboratory measurements in a
series of solutions with dielectric permittivities ranging from 1 to 81
and solution electrical conductivities ranging from 0 to 3 dS/m.
‡Precision describes the repeatability of a measurement. It is
determined for the CS650 by taking repeated measurements in the
same material. The precision of the CS650 is better than 0.05 %
volumetric water content and 0.01 dS/m electrical conductivity.
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