BOREAL LASER GasFinder FC, Руководство по эксплуатации

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6.2
Boreal Laser Inc. GasFinderFCr Operation Manual — Maintenance July 17th 2017
Retrorefl ectors
There are no moving parts and the only maintenance required is to clean
the windows. The windows are usually Lexan which is a soft plastic and
great care must be used when cleaning to avoid scratches.
The need for cleaning will be indicated by a consistent loss of light, which may
result in poor gas-concentration readings. Diffi culty in obtaining an adequate
light level may indicate that the head or probe has moved out of alignment
and should be checked fi rst.
Note: The instrument relies on a clear optical path to obtain readings of gas
concentration. Dust settling on the window of the retrorefl ector enclosure must
be cleaned off whenever it degrades the instrument’s performance. The average
value for the light level should be kept at the recommended values as determined
at the initial installation. It is diffi cult to clean the windows without scratching
them and should only be done it adequate light levels can not be obtained by
re-alignment.
Many dusts, especially aluminium oxide, are very abrasive, and care must be taken not to
scratch the windows when cleaning them. The recommended procedure for cleaning is as
follows:
Blow off any dust using canned compressed air • A . Note that compressed “shop” air may
contain oil from the compressor, and should not be used without a fi lter or oil trap.
If the window is streaked with rain-deposited particles, wash the window with copious •
amounts of water, using a spray bottle, (laboratory or other type) and clean fi ngers.
Gently wipe with a soft tissue. •
Spray a small quantity of anti-static •
B
solution on the window.
Gently wipe clean with a dry, soft tissue. •
A
These cans are available from camera shops and electronic stores or directly from Boreal Laser Inc.
B
A suitable anti-static solution is “Novus
™
No.1”, used by plastic fabricators and it can be obtained directly
from Boreal Laser Inc.
Light Level History is a good indicator of the condition of the equipment and forecasting a
time for cleaning. Cleaning intervals may vary from once per week to once per year depending
on environmental conditions.
The history can determine whether the light loss is gradual or intermittent.
A gradual decrease may indicate that dirt is building up on the windows. •
A sudden drop may indicate a local fog, obstruction of the path, a break in a cable or a •
misalignment problem.
A diurnal variation will indicate movement of the remote head mounting structure due to •
solar heating. See Section 7.7.