Norsonic nor1216, Instruction Manual

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18 Chapter 6
Maintenance
Maintenance
The need for maintenance depends largely on the
environmental conditions where the microphone sys-
tem is used. Contamination of dust, ice or snow on
the windscreen may alter the acoustic performance.
For most applications, it will be sufficient to check the
microphone periodically by using the system check
facility, e.g. every night. For permanent operation we
recommend to inspect the microphone and check the
microphone sensitivity with a calibrator at least two
times a year. The frequency for checking may be in-
creased in places with difficult weather conditions or
excess of dust.
The windscreen consists of two parts. The outer
part is hollow and sealed by a lower ring-shaped part.
Remove the upper part of the windscreen with care
(see figure). When the upper part is lifted upward, en-
sure that the lower part stay fixed – otherwise the rain
hood above may be harmed.
The outer part of the windscreen may be cleaned
by washing by hand using standard household wash-
ing up detergents. Ensure that it has been thoroughly
rinsed in clean water and is completely dry before it is
remounted. Do not use excessive heat for the drying:
85ºC maximum. However, we recommend to replace
the whole upper part every second year. In some loca-
tions, near to chemical complexes or in coastal instal-
lations it may be necessary to replace the windscreen
earlier (spare part Nor4529).
The lower part of the windscreen, the dust mesh
and rain hood are not parts that can be serviced by
the user. In case of wear or strong contamination we
recommend to order a replacement unit (Spare part
Nor4560) or send the part to the factory for refurbish-
ment.
Do not disassemble the assembly of microphone
and preamplifier outdoors. Contamination from humid-
ity or dust – or from your finger sweat – may lower the
performance.