Owner's manual

MAINTENANCE
Annual factory re-calibration recommended.
Maintenance on the unit is minimal. Replacement of the battery pack and cleaning
of the sensing chamber are the most frequent procedures that must be performed.
An annual re-calibration is recommended.
Cleaning the instrument sensing chamber depends on the length of time and the
concentration of dust the unit has been exposed to. In general, if monitoring a
concentration of 1 mg/m³ for a period of 8 hours, cleaning should be performed
every 24 hours. It is always recommend checking the zero reading after cleaning.
Procedures for Cleaning
1. Remove optical light trap that is held in place by brass thumbnuts located on
the reverse side of the unit.
2. Observe optical block. Using the dust free air, blow off any residue dust
inside the optical light trap and on the optical block.
3. Clean windows with cotton swab rinsed in cleaning solution and allow air to
dry.
4. Replace optical light trap.
5. Re-zero Unit (see Zeroing instructions.)
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