Casella CEL Microdust 880 IS real time dust monitor - Manual (Page 14)

Microdust 880nm & WinDust Application Software
Handbook HB3255-03
Page 14 of 51
The Configuration menu:-
The configuration menu contains all functions necessary to define the instruments current operating
mode. These functions include:-
•
Averaging period
The displayed dust concentration may represent a 1, 5 or 10 second rolling average. In some
measurement applications where aerosol concentration changes rapidly, a 5 or 10 second
averaging period will show increased stability in the displayed value.
Whilst the ‘Averaging period’ option is displayed, pressing the ‘Enter +Esc’ key combination
will change the selected averaging period. Pressing the ‘Esc’ key accepts the selected period
and returns to the dust concentration display.
•
Range Selection
All Microdust instruments have two measurement ranges identified as ‘High’ or ‘Low’. The
full scale indication of each range depends on the instruments model number. Range selection
may be set to ‘Automatic’ or alternatively locked to either the ‘High’ or ‘Low’ range. Pressing
the ‘Enter + Esc’ key combination will toggle the range setting. The ‘Automatic’ ranging
option is suited to the vast majority of sampling applications.
•
Back Light
The LCD display has a back light facility for improved visibility in low light conditions.
With the ‘Back light’ mode set to ‘ON’, the display will be illuminated for approximately 4
seconds following any key press activity. In the ‘OFF’ mode, the back light feature is disabled.
Setting the Time and Date
All Microdust models contain an internal real time clock which should be set to the local time and
date. When the optional data logging facility is used, dust concentration values will be recorded
against the current date and time.
Setting the date and time is simple. From within the configuration menu select the appropriate
‘Change’ window (Year, Month, Day, Hour, Min). Pressing the ‘Enter’ key moves to the ‘Adjust’
window. The ‘Up’ and ‘Down’ arrow keys are used to increment or decrement the displayed value.
The ‘Esc’ key accepts the new value.
To permit accurate setting of the clock, the ‘seconds’ value will be reset to zero when accepting a
change to the ‘minutes’ value.