Cleaning Windows
It is important that the optical windows of both the transmitter and the receiver
be kept reasonably clean and any mounting tubes free from build-up of dust and
fly ash. This can be accomplished by removing the transmitter and receiver and
wiping their windows with a soft, dry cloth. If the windows are cleaned, a
calibration is advised afterwards.
Clean Flue Condition Available
Should a clean flue condition become available and the instrument was
commissioned with an opacity offset, it is recommended that a calibration be
conducted to take advantage of this situation.
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