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Page 15 of 61
A USB keyboard (AZI P/N: 990-0230) can be used to navigate the menu system and for data
entry for items such as Location Names. Connect the USB keyboard to one of the two USB Type
“A” ports on the back of the instrument. Either upper or lower case characters may be entered
when using a USB keyboard, while only upper case letters are available from the J405 keypad.
SAMPLE menu
SAMPLE MODE
The Sample Mode setting provides the choice between auto-sampling and manual sampling. For
normal use, use manual sampling, which is the instrument default setting. If auto-sampling is
selected, the instrument will automatically sample at the interval set in
SET SAMPLE
INTERVAL
(below) without monitoring or attendance by the user.
Use the ▲and ▼arrows to
toggle between Manual and Auto, and use
ENTER/START
to save the selection. Use the
ESC
key to exit without saving changes. If auto-sampling is selected, the word Auto will appear below
the system date on the instrument’s main screen.
UNITS
Sample results can be displayed in micrograms per cubic meter (µg/m
3
) or milligrams per cubic
meter (mg/m
3
). To change the displayed units, select
UNITS
from the
SAMPLE
menu. Use the
▲and ▼ arrows to toggle the selection, and press
ENTER/START
to save the selection. Use the
ESC
key to exit without saving changes. The default selection is µg/m
3
, and µg/m
3
is used
throughout this manual for consistency. The relationship between µg/m
3
and mg/m
3
is as follows:
1000 µg/m
3
= 1 mg/m
3
and 1 µg/m
3
= 0.001 mg/m
3
When the selected unit is changed with the
UNITS
menu item, all internally stored samples are
converted and displayed with the new selected unit, regardless of what unit was in use when the
sample was taken originally.
SET SAMPLE INTERVAL
If auto-sampling is being used (as set in
SAMPLE MODE
above), the sample interval
determines how often the J405 will automatically take samples. Use the ▲and ▼arrow keys to
scroll through the available sample intervals of 1, 2, 5, 10, 15, 30, 45, 60, 90 and 120 minutes, and
use
ENTER/START
to save the selected interval. Use the
ESC
key to exit without saving
changes.
The sample intervals refer to specific times on the instrument clock as measured in whole
multiples of the selected interval. For example, selecting a 10-minute sample interval will result
in samples being taken on the hour, 10 minutes after the hour, 20 minutes after the hour, etc., not
every ten minutes from when auto-sampling is initiated. Refer to the chart on the next page for
examples of how these intervals work. When the clock reads :00 seconds at the appropriate time,
the sample will be taken.
