Agilent Technologies 8590 Series Service Manual page 353

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A serial-number label is attached to the rear of the analyzer. This label
has two instrument identification entries: the first provides the
instrument's serial number and the second provides the identification
number for each option built into the instrument.
The serial number is divided into three parts. The first four digits are
the serial-number prefix; the letter indicates the country of origin; the
last five digits are the suffix. The serial-number label contains a
three-digit option number for each option built into the analyzer. Each
option number is entered sequentially below the serial number. See
Table 8-1.
Figure 8-1 Typical Serial-Number Label
The serial-number prefix is a code that identifies the date of the last
major design change that is built into the analyzer. The letter identifies
the country where the instrument was manufactured. The five-digit
suffix is a sequential number and is different for each instrument.
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