Campbell-scientific CS650 and CS655 Water Content Reflectometers Uživatelský manuál stáhnout pdf (Strana 14)

CS650 and CS655 Water Content Reflectometers

CS650 CS655

Volumetric Water

Content using Topp

Equation (m

)

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

Operational

Range:

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

3600 cm

*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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