9
LI0056 – Revision 28 May 2015
Reinstalling the Microphone Assembly
The steps for reinstalling the microphone assembly are basically the reverse of the steps
for removing the assembly.
The diaphragm of the microphone must be flush with the outer surface of the probe tube
when mounted, as required by the ANSI S12.42 standard. The following ensures that
this requirement is met:
• The guard ring must be situated correctly on the microphone assembly. (This is
ensured by the design and during assembly at the factory.)
• The guard ring must be properly seated against the upper inner wall of the tube.
M2 hex screw securing the assembly against the upper
inner wall
Correct positioning of the guard ring ensures that
the diaphragm is flush with the surface
The guard ring seated against the inner wall
Important:
The M2 hex screw should be tightened enough to secure the microphone
assembly, but do not use excessive force.
Important:
Do
not
remove the protective grid and/or the guard ring as this may
compromise correct positioning of the diaphragm relative to the probe surface.
Fig. 8.
The microphone assembly secured properly inside the probe housing.