Ametek Land 4500 MKIII, User Manual

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B - 7
Model 4500 MkIII Opacity and Dust Monitor
User Guide
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
screws on either side of the Retro-Reflector Mount. Remove the
reflector and stow in the purge housing.
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 clamp 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 M10 nut (1) on the air purge
flange and to move it vertically, adjust
the M10 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 4 pairs of spring washers between the air purge
flange and the mounting flange are under moderate compression. It is
important that the instrument is firmly held in place to maintain optical
alignment.
9) Open the Retro-Reflector case, re-fix the Retro-Reflector in position, and
tighten the captive socket head screws. Close the Retro-Reflector case
and fasten the two quick-release clamps.
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