YSI 6000UPG - Manual (Page 23)

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STEP 3. INSTALL BATTERIES
NOTE: Some 6000 UPG s are not configured with internal battery capability. If the 6000 UPG you
have purchased is configured to operate from internal batteries, it will have a battery compartment
and battery lid as illustrated below. If your 6000
UPG does not have a battery compartment, ignore
these battery installation instructions.
Your first set of batteries is supplied with the instrument. Install 8 C-size
alkaline batteries as follows:
Use the hex driver, supplied in the 6040 Maintenance Kit, to loosen the
battery lid screws.
NOTE: The battery lid screws are captive. It is not necessary to remove
them from the lid completely.
Remove the battery lid and install the batteries, as shown.
NOTE: Observe the correct polarity before installing the batteries into
the battery chamber.
Be sure the bottom O-ring is installed in the groove of the lid. Check the
O-ring and sealing surfaces for any contaminates which could interfere
with the O-ring seal of the battery chamber. Remove any contaminates
present. Also clean the protective O-ring which located in the middle of
the side of the battery lid.
Apply a very thin coat of O-ring lubricant (supplied in the 6040 Maintenance Kit) to both battery
chamber O-rings.
Return the battery lid and tighten the screws. DO NOT OVER TIGHTEN.