Maintenance
Manual CWD 2005
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Manual CWD2005.doc
7.
Maintenance
7.1.
Safety instructions for maintenance or repair
Use the main power switch to remove power for maintenance and other work.
Caution:
The burner, ignition electrode and the heat exchanger can be very hot.
Do not jump out any switches or safety devices.
Please use only factory original spare parts for any service or repairs.
7.2.
Periodic maintenance
Inspect the following parts after 6 months operation.
The maintenance intervals for the instrument are depending on the ambient air and
the process gas conditions found at the job site.
All hose connections to the gauges, pressure sensors, specific gravity cell and the
primary air connection to the burner should be checked and changed if necessary
during annual maintenance.
The gas pressure regulator diaphragm should be checked. If this has become
hardened or brittle it has to be replaced, as this is essential for stable measurement.
Check the rubber connection on the Wobbe jet and air jet for any leakage.
Both the thermopile and heat exchanger should be removed and cleaned.
Combustion by-products can form crystals and these can be washed away with warm
water and when these parts have been thoroughly dried, they can be re-installed.
Note:
The heat exchanger is mounted on a gasket that remains in place and the
gasket should always be inspected visually and replaced if necessary whenever the
heat exchanger is removed.
Calibration, which usually lasts 5 to 10 minutes, uses 5 to 10 liters of calibration gas
(see formula in section 3.3). It is possible to estimate how long the remaining
calibration gas will last if the calibration cycle is programmed at set intervals.
7.3.
Consumables
Consumables include paper filters, fuses, connection hoses and calibration gas. All
the consumables considered essential by the factory are contained in the optional
spare parts package for normal annual operation.
Wherever possible, calibration gas should be purchased by the customer in cylinders
from a local supplier. The gas can also be purchased from the manufacturer, with all
necessary fittings.
Note:
International and Federal regulations prohibit air transport of compressed
gases.