Maintenance 
Alarm does not 
turn on 
correctly 
Check the alarm settings in the 
Settings->Alarm screen 
Make sure the logging interval 
and time constant are set as 
short as possible (30 seconds 
or lower) 
Alarm output wired with 
reverse polarity 
Alarm wires are polarized. 
Voltage input must be wired to 
alarm input (+) 
Instrument 
does not store 
new data 
Delete or transfer historic data 
Instrument is in Survey 
mode 
The instrument does not store 
data in survey mode. Can to 
manual or program log mode 
Flow Error is 
indicated on 
front screen 
If sampling from a duct, 
instrument may have 
problems overcoming 
pressure differences 
Attach both the input and the 
exhaust port into the duct 
Remove obstruction if still 
present. Press any key to 
bypass 
Internal pump failing, 
indicated by inability to 
adjust flow rate to full 
range 
Factory service may be 
required 
Filter Cassette clogged 
or has mass loading 
Replace the filter cassette. See 
the maintenance section of the 
manual