Campbell Scientific HydroSense® Soil Water Content System (CS620, CD620) - Manual (Page 6)

HydroSense Soil Water Measurement System (CD620, CS620)
1.2 HydroSense Modes
The Water Content Measurement Mode displays the measurement result as
percent volumetric water content and shows the period of the probe output in
milliseconds.
In the Water Deficit Mode, HydroSense measurements are taken at lower and
upper water contents chosen by the user and stored in memory as reference
values. The reference values are then applied to subsequent measurements to
determine the amount of water that must be added to bring the soil to the upper
water content. The relative water content based on the reference values is also
displayed.
See Sections 4 and 5 for detailed operating information.
2. Specifications
CD620 HydroSense Display Unit
Measurement % Volumetric Water Content
Resolution 1.0%
Environmental Splash resistant
Display 16 character, 2 line LCD
Keypad Two button membrane keypad
Power 2 x AAA 1.5 VDC alkaline batteries
Current Consumption Sleep <50 μA
Idle 1.5 mA
Measurement 70 mA
Battery Life Approximately 12 months
Dimensions 120 (w) x 73 (d) x 24 (h) mm (4.7” x 2.9” x 0.9”)
Weight 166 g (7 oz) includes batteries
CS620 Water Content Reflectometer
Accuracy ±3.0% volumetric water content with electrical
conductivity <2 dS m
-1 .
Range 0% to saturation*
Stabilization time Instantaneous
Response time <50 milliseconds
Power requirement 100 milliamps at 5 ±0.03 volts
Output Square wave with ±2.5 VDC amplitude
Dimensions Head 105 x 70 x 18 mm (4.1” x 2.8” x 0.7”)
Rods 120 or 200 mm length , 5 mm diameter, 32
mm spacing
2