Instruction manual
HS2 and HS2P 
On the display of my 
HydroSense II, the 
battery icon, the 
Bluetooth icon, and the 
GPS icon are visible, but 
a forth icon appears to be 
missing. 
The forth icon is the Bluetooth connection icon. 
It appears only when the HydroSense II is paired 
to a computer and there is an active data 
connection between them.  This happens when 
collecting data or changing configuration 
settings.  Generally, when using the computer to 
collect data from the HydroSense II, focus is on 
the computer screen and not the HydroSense II 
display, so this icon may not be noticed. 
11.  Maintenance 
11.1  Batteries 
The HydroSense II is powered by four AA alkaline batteries. Use a high 
quality battery for best operation. Battery brands considered adequate for the 
power requirements of the HydroSense II include (inclusively) Energizer
®
, 
Duracell
®
, and Panasonic
®
. Under normal use, the life of high quality batteries 
should be close to a year.  Replace the batteries when the voltage is less than  
4 V. The battery indicator icon on the main screen (p. 14) gives a warning of 
the battery status. When the indicator shows the batteries are near empty (
 ), 
have replacement batteries available. The HydroSense II carry case has a spare 
battery pack (holder only – batteries not included). 
Configuration settings, stored data, and zones are stored in flash memory such 
that they will be preserved during battery replacement. 
11.1.1 Replacing the Battery Pack 
The process to replace the battery pack is: 
1.  If using the HS2P, follow the procedure provided in Section 11.2, 
Removing Display from HS2P Pole. 
2.  Place the display face down on a clean dry surface.  
3.  Remove the four (4) Phillips screws on the back of the displays case with 
the Phillips screwdriver provided in the carry case. 
4.  Carefully separate the back cover from the front cover, taking care to keep 
the display face down (if the unit is turned face up, the battery holder 
inside may fall out and damage the battery wires).  
5.  Unclip the battery connector from the battery holder. 
Although this connector looks similar to the terminals of a 9 
V PP3 battery, it is not compatible with the 9 V battery.  Do 
not connect a 9 Vdc battery to the terminals, because it can 
permanently damage the HydroSense II.   This damage is 
not covered under the warranty. 
6.  Connect the spare battery holder to the battery connector.  
CAUTION 
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