Campbell Scientific CS616 and CS625 Water Content Reflectometers - Manual (Page 9)

CS616 and CS625 Water Content Reflectometers
CS625 Compatibility
Dataloggers: CR200X series
CR200 series
Probe-to-Probe Variability: ±0.5% VWC in dry soil, ±1.5% VWC in
typical saturated soil
Resolution: better than 0.1% volumetric water content
Water Content 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 measurement range 0% VWC to 50% VWC
Precision: better than 0.1% volumetric water content
5.1 Dimensions
Rods: 300 mm (11.8 in) long, 3.2 mm (0.13 in)
diameter, 32 mm (1.3 in) spacing
Probe Head: 85 x 63 x 18 mm (3.3 x 2.5 x 0.7 in)
5.2 Weight
Probe (without cable): 280 g (9.9 oz)
Cable: 35 g m –1 (0.38 oz per ft)
5.3 Electrical Specifications
Output
CS616: ± 0.7 volt square wave with frequency
dependent on water content
CS625: 0 to 3.3 volt square wave with frequency
dependent on water content
Power: 65 mA @ 12 Vdc when enabled, 45 µA
quiescent
Power Supply Requirements: 5 Vdc minimum, 18 Vdc maximum
Enable Voltage:
4 Vdc minimum, 18 Vdc maximum
Maximum Cable Length: 305 m (1000 ft)
Electromagnetic
Compatibility: The CS616/CS625 is Πcompliant with
performance criteria available upon request.
RF emissions are below EN55022 limits if the
CS616/CS625 is enabled less than 0.6 ms and
measurements are made at a 1 Hz (1 per
second) or slower frequency. The
CS616/CS625 meets EN61326 requirements
for protection against electrostatic discharge
and surge.
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