Norsonic nor1218, Instruction Manual

14

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.