104
8009389/YN39/V3-0/2015-08| SICKOPERATING INSTRUCTIONS|GM35
Subject to change without notice
MAINTENANCE
6 If the duct-side flange with tube is not sealed by the angle flange:
▸ Seal the duct-side flange with tube using a suitable protective cover to prevent gases
or dust escaping from the duct.
If the system is equipped with a purge air supply, the supply can now be switched off. It can
often be useful, however, to leave the purge air supply running (see also following warning).
Detailed information on switching off the purge air unit,
see “Maintenance work on the
purge air supply”, page 106
.
9.3.2 Visual inspection and enclosure cleaning
▸ Check the measuring probe for corrosion, damage, and any obvious signs of condensate
or dirt deposits. If the probe is damaged or shows excessive condensate deposits,
contact SICK Service or your local sales representative.
▸ Check the sealing ring between the SR-unit and measuring probe (
see “Removing the
measuring probe with attached SR-unit from the duct-side flange”, page 103) seating is
correct as well as for brittleness and replace it when necessary.
▸ Check the enclosure of the SR-unit for damage such as cracks,
▸ If a weatherproof cover is used, check its condition and whether the securing pins on the
top of the SR-unit are secure. If necessary, apply new epoxy resin adhesive.
▸ Clean the visor on the right side of the SR-unit.
▸ Clean the entire enclosure of the SR-unit when contaminated.
▸ Check cables for damage. Pay special attention to any signs of abrasion or bending at
cable entries and take protective measures when necessary. The prefabricated cables
are available as spare parts; contact SICK AG Service when necessary.
9.3.3 Cleaning the optical interfaces on the SR-unit
1 Check the optical interface on the SR-unit (front window,
see page 108) for
contamination and, if necessary, clean with an optical cleaning cloth. Do not use any
detergents because these leave invisible residues that could falsify the measuring
result. The cleaning cloths can however be moistened with distilled water when
necessary.
2 Close and lock the SR-unit enclosure again and seal off the connection to the flange
fixture with the four quick-release fasteners to protect the cleaned optical interface
against humidity or dust.
3 When a purge air supply is fitted (GMP measuring probe):
▸ Continue with the maintenance for the purge air unit (
page 106).
Risk of burns when touching the hot measuring probe
If the sample gas duct is operated at high temperatures, the measuring probe
will remain hot for a long time after it has been removed.
▸ Wear protective clothing during work on the hot probe.
▸ GMP measuring probes cool down faster when the purge air supply remains
switched on for a while.
WARNING: Take care when the duct is pressurized!
▸ If the duct is pressurized, appropriate protective measures must be taken,
in particular wear a protective mask.
▸ Prepare a suitable cover for the opening on the device flange of the SR-unit
and keep it available.
▸ Once the SR-unit has been opened, place the cover on the opening of the
device flange immediately.
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