Chapter 5
48
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
UST
T
RAK
by following the
instructions given in Chapter 4,
“
,” under section
If the unit cannot be zeroed, let
the D
UST
T
RAK
equilibrate to
ambient conditions and try
zeroing the D
UST
T
RAK
again. If
the Service 7 error still persists,
it might be due to laser failure
and the unit needs to be
returned to TSI.
Summary of Contents for DustTrak 8520
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Page 88: ...Index 78 W X Y warning v warranty 2 wrist strap 1 3 Z zero checking 38 zero filter 1 ...