Campbell Scientific HydroSense® Soil Water Content System (CS620, CD620) - Manual (Page 17)

HydroSense Soil Water Measurement System (CD620, CS620)
8. Maintenance
8.1 Replacing Battery
FIGURE 8-1. Rear view of the HydroSense display unit with battery
cover removed
The only user-replaceable components in the HydroSense display unit are the
two 1.5 volt AAA batteries used to power the unit. Under normal use, battery
life should be well in excess of 1 year. When the batteries require
replacement, a small battery symbol will appear on the bottom right hand
corner of the display. It is recommended that high quality, long-life alkaline
batteries be used. To replace the batteries, remove the two silver screws from
the back of the HydroSense display, remove and replace the batteries, making
sure that the positive end of each battery is inserted into the end of the battery
holder with the RED polarizing washers. It is important that batteries are
not reversed during replacement as damage to the unit can occur. Do not
remove the red polarizing washers. Replace the cover plate and silver screws.
Calibration settings will NOT be lost when batteries are replaced.
8.2 Rod Installation/Replacement
Threaded inserts in the probe epoxy body allow user replacement of the 12 and
20 cm rods. Using rods of different length increases the versatility of
HydroSense. Additionally, if the probe rods are accidentally bent, simple
replacement using spare rods prevents instrument downtime.
The rods have a nut-shaped collar at the base of the unthreaded portion of the
rod. This collar distributes lateral forces over a relatively large area and
reduces rod bending/deformation during probe rod insertion for measurements.
The rods must be fully inserted into the threaded inserts of the probe with the
nut in full contact with the probe body threaded inserts. The nut is tightened
using the open-ended wrench that is shipped with the CS620.
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