Air Purge
The purges mount directly onto the site mounting flanges. Separate the front
flange from the air-purge by unscrewing the four retaining nuts. This should
now be bolted to the site mounting flange with a rigid gasket fitted between
them, using the four countersunk screws provided.
! Before mounting the air purges, ensure that air is supplied to
the air purge unit. If this precaution is not observed then the air
purge and the optical surfaces may be severely contaminated.
The rear (adjustable) flange is then offered up to the front flange on to the
protruding studs, taking care that the ‘O’ ring seal on the flange locates
smoothly into the central aperture. This is then re-secured by the four nuts
which screw down onto the rear flange. The arrangement should now appear
as below.
Figure 3 : Adjustable Mount and Air Purge Details
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