5. MAINTENANCE
5.1 Routine Checks
Problems with the Instrument can be avoided if the installation is maintained regularly,
especially with regard to parts used to pre-condition or route the various gases, and in
particular the sample gas.
The User should be aware of any constituents of the gas that may directly or indirectly affect
the optical components within the instrument as described in Section 2.7.2.
If Water Traps and/or Particulate (dust) Filters are included in the installation these must be
periodically inspected and maintained to avoid overflows or blockage.
5.1.1 Water Vapour
If, during the initial installation of the Instrument, the presence of high water vapour content
was not expected (and therefore means of trapping it was not included) signs of it should be
looked for during routine maintenance, particularly during the first few weeks of operation.
If transparent piping was used, water can often be seen in droplets on the inside walls or
collecting at a low point in the piping arrangement. With opaque or steel pipes, disconnect them
at a low point to see if water drips out.
If signs of water are found, it may eventually block the pipes or result in amounts being drawn
into the instrument which may affect the pumps, solenoids etc., as well as the optics. In this
case, it is recommended that some form of Water Trap be fitted, such that the contents can be
easily seen and regularly inspected.
If the Sample does contain water vapour, leave the Instrument switched on if it is not in use,
and with the Sample Pump off. This will help to prevent condensation within the instrument. A
service visit is advisable in cases of water ingress, so that the optics can be cleaned. Dirty
optics will reduce performance.
5.1.2 Dust
Long term problems may occur if dust is in the sample. Usually this cannot be ‘seen’, but over a
period of time it can build up and affect all parts of the gas path. Dust may also block the
particulate filters fitted in the inlets of the Instrument and may therefore result in a blockage or
a reduction in flow.
As part of the maintenance routine, inspect the Inlet Filters for signs of dust. If there is any sign
of dust, the sample line must be fitted with a suitable filter (down to 1O microns) and the filter
elements regularly replaced.
Where dust has penetrated the instrument, arrange for a service visit so that the optics can be
cleaned and full performance restored.
To Next Page
Loading...
Need help?
General
