HS2 and HS2P
4
TABLE 4-1. Comparison of HydroSense II and HydroSense(I)
Feature
HydroSense II
HydroSense (I)
Volumetric water
content and period
Yes, period as
μs
Yes, period as ms
Relative water content
and water deficit with
wet and dry references
Yes (10 profiles)
Yes (5 sites)
Sensor rod length
20 cm and 12 cm
(replaceable but not
interchangeable)
20 cm and 12 cm
(both replaceable and
interchangeable)
Accuracy
20 cm rods: ±3%
(EC
≤
4 dS/m)
12 cm rods:
±3% (EC≤
6.5 dS/m)
±3% VWC
(EC < 2 dS/m)
GPS and geotagging
Yes
No
GPS zones
Yes
No
Data storage
Yes (1000+ readings)
No
Bluetooth
Yes
No
Date and time
Yes (with GPS accuracy
when available)
No
Display
128 x 64 pixel graphic
LCD
2 line x 16 char
alphanumeric LCD
LCD backlight
Yes
No
Firmware updates
User updateable
Factory only
Field carry case
Yes
No
Portable
Yes
Yes
Battery life
1000+ readings
2000+ readings
Unlike the HydroSense (I), the 12 cm and 20 cm rods of the
HydroSense II are not interchangeable.
The HydroSense II can display relative water content (RWC) based on wet and
dry references set by the user. The unit also displays water deficit, which
indicates how much water is required (in mm of applied water) to return the
soil to the previously saved wet reference.
Measurements are made by fully inserting the sensor rods into the soil and
pressing
. The process takes 2 to 3 seconds. The measurement can be stored
and later downloaded to a computer for display and analysis. Communications
between the computer and HydroSense II are via
(p. 19)
. The
HydroSense II includes a
enables data to be stored with position information (
(p. 20)
).
NOTE
