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The unit will display a message to indicate that a cleaning or replacement is required. Cleaning <br />of the window is done by using anhydrous methanol. After cleaning the lamp is inspected for <br />any remaining film and the process is repeated if required until the lamp is clean. The sampling <br />Pump is rated for 4,000 to 5,000 hours of continuous operation. The pump is replaced after 6 <br />months is the unit is heavily used, but does not need replacing for longer periods if only used <br />occasionally. <br />48 <br />