GASSONIC OBSERVER-i
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8.3.6. Sound Source Assembly Replacement
To replace the sound source assembly (805554-3), loosen the 2 M4 screws. Remove the old sound
source assembly and discard the O-ring. Replace the new O-ring and plug the two-pin connector into
the sound source assembly. Tighten the two M4 screws. Perform a Sound Source Calibration (See
section 8.4) and a Forced Acoustic Test, Section 4.5.2.
Figure 11: Sound Source Assembly Replacement
8.4.
Sound Source Calibration
8.4.1. Considerations and Preparations
When performing a sound-source calibration, the unit needs to be powered up and the operator has to
have access to the detector. Furthermore, a magnet-stick is needed for this operation.
When performing the sound-source calibration make sure that nothing is blocking the path from the
sound-source to the microphone. Furthermore, ensure that the operator does not hold his/her hands
close to the detector when the sound-source calibration is being performed. It is advised to stand
behind the sound-source when performing the calibration.
NOTE:
Do NOT perform a sound source calibration unless you have
replaced
the sound source!
8.4.2. Sound-source
Calibration
Activate the UP-switch (
▲
) 7 times by means of the magnet-stick (7-UP). On the unit's display a "wait"
indication will be seen for a few seconds. Afterwards an “S” will be displayed followed by the decibel
(dB) level. This is the dB level output of the sound-source, and should be a value between 84 dB and
100 dB.