MIP LM 3188, User Manual, Page: 18 / 41

Page 18 (41)
4.3 QUALITY ASSURANCE PROGRAM
In the factory, we are keeping the track with each instrument delivered and maintain for
service purposes individual test cards for each manufactured product. Actually the QAP
goes further than that. It records all the people that are involved in the manufacturing pro-
cedure, their qualifications and duties. It also identifies all the laboratory instruments, used
during the testing of the products, specifies what is documented and how these documents
are filed. An empty, individual test sheet is enclosed. It shows what features are tested in
the laser monitors. As we normally do not know what kind of dust will be measured by the
user, we
assume the “standard” particles of 1 micrometers and 1 kg/dm
3
. Then we perform
mass calibration, based on to these values and assumed measuring path of 1 m. That is
why the “normalized” laser meter will give a reading of 800 mg/m
3
with a filter =1.0D, when
it leaves the factory. All other points are carefully tested at our laboratory and the meters
carefully adjusted for the best linearity with a calibrated filter set.