Operational specifications

Relative dielectric permittivity specifications provides the operational specifications.

Relative dielectric permittivity specifications
	CS650	CS655
Relative dielectric permittivity
Range	1 to 81
Accuracy† 1 to 40:	±(2% of reading + 0.6) for solution electrical conductivity (EC) ≤3 dS/m	±(3% of reading + 0.8) for solution EC ≤8 dS/m
40 to 80:	±1.4 for solution EC ≤3 dS/m	±2 for solution EC ≤2.8 dS/m
Precision‡	<0.02
Volumetric water content
Range	0% to 100%
Accuracy†	±1% (with soil specific calibration), ±3% (typical with factory VWC model) where solution EC < 3 dS/m	±1% (with soil specific calibration), ±3% (typical with factory VWC model) where solution EC < 10 dS/m
Precision‡	<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)
Precision‡	0.5% of bulk electrical conductivity (BEC)
Temperature
Range	–50 to 70 °C
Resolution	0.001 °C
Accuracy†	±0.1 °C (for typical soil temperatures [0 to 40 °C] when sensor body is buried in soil), ±0.5 °C for full temperature range
Precision‡	±0.02 °C
Sensing volume*	7800 cm³	3600 cm³
Sensing volume approximately 7.5 cm radius around each sensor 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.