Chapter 5
Symptom Possible Cause Corrective Action
“SERVICE”
and “7”
displayed.
High humidity or laser
failure.
Typically occurs if the unit is
turned ON either after sampling
under high humidity conditions
or when instruments are stored
at a different temperature than
that of the sampling area.
Bypass this error by pressing
“Calibrate” key. Zero the
D
USTTRAK by following the
instructions given in Chapter 4,
“Maintenance
,” under section
“Zero Checking/Re-Zeroing
”.
If the unit cannot be zeroed, let
the D
USTTRAK equilibrate to
ambient conditions and try
zeroing the D
USTTRAK again. If
the Service 7 error still persists,
it might be due to laser failure
and the unit needs to be
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