ES-405-9800 Manual Rev A Page 26
8.6 Factory Service Interval
The ES-405 needs to be periodically returned to the factory for service and recalibration. The
recommended period is 24 months during continuous use. However, some users establish their
own interval depending on the harshness of the sampling conditions, particulate levels, and data
scrutiny. High concentration operation will often require more frequent factory service.
Factory service primarily consists of optical system cleaning, laser/detector checks, and
recalibration. As-found calibration checks can also be requested. Contact the Met One technical
service department to schedule ES-405 service. A Return Authorization (RA) number must be
obtained before the unit is returned.
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