16
MAINTENANCE
The sensor windows should be kept clean and grease free. Grease and finger marks
that look clear may be opaque to UV. Ensure that solvents do not come into contact
with plastic parts, especially the perspex window over the visible (left-hand) sensor.
Battery
The batteries should be replaced as soon as the battery symbol is seen on the bottom
left of the display. Any 1.1 to 2.5 volt AA style battery can be used, though it is
preferable to use alkaline cells because of their longer life and much reduced tendency
to leak.
The battery compartment can be accessed by removing the single screw in the bottom
centre of the case.
Suggested battery types (2 off required):
MANUFACTURER TYPE
Duracell MN1500
Ever Ready LR6B4
Nickel Cadmium rechargeable types can be used but they cannot be charged inside the
instrument.
Mains Power Supply
The optional external mains power supply can be connected to the power input socket
on the right hand side of the instrument. This socket is only fitted if requested with
order because the hole required compromises the moisture seal on the casing.
Software Version
The internal software version is displayed when the 764 is turned on. A typical start-
up message might be “ELSEC 764 V2.1”, in this case the software version is 2.1
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