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Model 4500 Premier Dust and Opacity Monitor
34
5
Align the Retro-Reflector
Opening the Retro-Reflector Case & Releasing the Reflector
1.
Open the Retro-Reflector case by undoing the two quick-release clamps.
2.
Release the Retro-Reflector Mount by unscrewing the two
captive socket head screws
on either
side of the Retro-Reflector Mount and allow the Retro-Reflector to drop into a horizontal position.
3.
Close the case and fasten the quick-release clamps.
Warning
Eye and face protection must be worn when looking into hot gases.
4.
Observe the alignment target through the window
(3). A bright green spot (4) should be visible.
5.
If the green spot is
not
visible undo the quick
release clamps on the Retro-Reflector and look
down the purge barrel. The bright green light
from the Transceiver should be clearly visible.
If not, then the Transceiver is either grossly
misaligned or the instrument is
malfunctioning.
6
To move the green spot horizontally adjust
the M12 nut (1) on the air purge flange and to move it
vertically, adjust the M12 nut (2), also on the air purge
flange as illustrated above. Adjust these nuts until the
green spot is central in the inner circle.
7
In bright sunshine the green spot on the alignment target
may not be visible. In this case return to the
transmissometer, undo the quick–release clamps and
swing the instrument away from the purge. It should now be possible to adjust the Retro-
Reflector until the bright circle of sunlight, visible through the transmissometer purge unit, is
centred on the target.
8
Ensure that the 6 pairs of spring washers between the air purge flange and the mounting
flange are under moderate tension. It is important that the instrument is firmly held in place to
maintain optical alignment.
9
Open the Retro-Reflector case and re-fix the Retro-Reflector in position by tightening the captive
socket head screws. Close the Retro-Reflector case and fasten the two quick-release clamps.
10
Now align the Transceiver.
Captive
Socket Head
Screws
Quick Release
Clip
Alignment Target
1
3
2
4
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