Appendix G. Replacing the Battery
The battery must be replaced when its voltage is too low (battery Low or Low-
Low alarm). When the battery is disconnected for its replacement, the value of the
following parameters is saved:
• Setup > Temperature Setup
• Service > Sensor Param
• View Readings > View History > View Sensor Card History
However, when the battery is removed, the value of the following parameters is
lost:
• Setup > Alarms Setup
• Setup > Date & Time
• Setup > Comm Setup
• Setup > History Setup
• Setup > Relay Setup
• Setup > I/O Setup
• Alarms > Alarms History
• View Readings > View History Data
To replace the battery, proceed as follows:
Note: Step 1 below can be skipped if the Hydran M2-X was never put in service
and if the Hydran M2-X’s default parameter values have not been changed.
1. Because some Hydran M2-X’s parameters are lost (see above) when the battery
is disconnected, they must be recorded. There are two methods:
• Use the Perception software. For connection details, see Chapter 5; for
details on the software, see the Perception Manual.
- History files are transferred automatically as soon as the
communication is established between the Perception software and
the Hydran M2-X. The Histo Download in Progress... message remains
displayed in the Perception window during the transfer.
- Manually note all parameters in the Hydran M2-X’s Communication
submenu. These parameters are the only ones that cannot be
accessed from the Perception software.
• If the Perception software cannot be used, manually note the values of all
Hydran M2-X’s parameters. This method is more difficult and can be source of
errors.
2. Power off the Hydran M2-X.
3. Remove the cover.
4. Remove the two screws holding the cover of the electronic card cage.
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