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Settings 33
the ISO4406:1999 test Format and then entering values as required. As an exten-
sion to ISO4406:1999 it is also possible to specify codes for the other measured
sizes too. If this is not needed then the entries can be left blank.
NAS1638 Alarm Levels
NAS1638 can be used by selecting this as the test Format . The headings and boxes
for the available settings change appropriately. NAS1638 represents the overall
cleanliness level as a single code, this being the highest of the individual codes
generated for each defined particle size band. Hence we have the option of setting
a limit on this overall contamination class (the Basic Class ), or we can set individual
limits on any combination of the classes for the defined particle size ranges.
AS4059E Table 2 Alarm Levels
AS4059E Table 2 uses letters instead of numbers to indicate the particle size range,
so the settings are labelled appropriately. The standard specifies ways to represent a
cleanliness level using only a subset of the available particle sizes, for example B-F.
The user can achieve this by only entering settings for the sizes desired, leaving the
others empty. So a limit of AS4059 7B-F could be represented simply by entering
a value of 7 for B,C,D,E and F.