ETS-Lindgren HI-3604 ELF Survey Meter - Manual (Page 39)

HI-3604 Manual Page -- 31
6.0 MAINTENANCE
Battery Replacement
When the battery symbol lights to indicate low battery voltage,
replace both batteries. Batteries are replaced by removing the
two Phillips flat-head screws and the nuts and lockwashers (on
the two fiber optic connectors) on the bottom end plate of the
HI-3604 readout module. The batteries are held in place by the
end plate and will slide out easily when the plate is removed.
Replace with 9 volt alkaline (NEDA 1604A, Duracell MN1604
or equal) being careful to observe proper polarity of each battery
(refer to the label on the bottom of the readout module case for
proper orientation of the batteries). When viewing the back side
of the HI-3604, the batteries go in with the positive terminal
facing to the left. The batteries are inserted with the battery
terminals pointed into the case as the batteries are inserted. As
with any battery operated device, do not leave exhausted
batteries in the instrument and remove batteries if the
instrument will not be used for an extended period of time.