Campbell Hydrosense, Instruction Manual

Page: 17 / 27

HydroSense
13
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 disc-shape 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
collar in full contact with the probe body threaded inserts.