Xylem Expert 800-900 - Manual (Page 7)

Manual
GB Manual Expert Log 800-900.doc
7
Replacing the battery
Battery: Sonnenschein 3.6V lithium AA type
The Expert should be dried prior to opening to prevent water entering the instrument during
opening. The data logger should only be opened or closed in dry ambient air!
Expert 900
The battery is replaced by first removing the knurled nut, followed by the battery sleeve:
O-rings
Battery sleeve
Expert 800
The bracket and knurled nut should be unscrewed first in the case of the Expert 800. The battery
sleeve can then be removed:
Bracket
Knurled nut
Note:
It is recommended that the battery be first shorted (for approx. a half a second) prior to insertion.
This is necessary because the voltage is no longer at nominal level after a longer period of
storage. The battery is effectively “reactivated” by shorting it.
Please note the correct polarity when inserting the new battery (see symbol on battery bracket).
This opportunity should also be used to check the black O-rings which seal the battery chamber.
The ring seals must be replaced if they show evidence of damage. It is also important to ensure
that the O-rings are not damaged when remounting the sleeve.
The battery capacity indicator is automatically set to 99% again each time a battery is replaced
(voltage interruption). This also occurs if the same battery or a discharged battery is inserted. The
battery should for this reason only be replaced when it has been ascertained that it is truly flat.
It is recommended that the pressure sensor be cleaned carefully from time to time if the data logger is
being used in extremely dirty or contaminated media:
Caution:
The pressure sensor membrane is extremely delicate. The membrane must therefore never be
touched!!
The protective cap cannot be removed. Simply rinse the sensor off under flowing water.