Emerson Rosemount CT4400, Reference Manual

Page: 85 / 106

7.7 Cleaning the analysis cell mirrors
Cleaning the analysis cell mirrors will only be required if the sample gas is not conditioned
in accordance with gas requirements defined in the General characteristics
Table 1-3 and
the Environmental characteristics Table 1-4 .
For example, it is possible that the mirrors inside the cell may become contaminated if
contaminants are carried into the cell in water droplets in the gas being sampled if it is not
conditioned correctly the mirrors would then require to be cleaned to remove any
contamination from them.
The mirror surface is highly reflective and susceptible to damage if cleaned incorrectly or
excessively. Damage to the reflective coating on the mirrors
WILL
affect the analyzer
performance. Mirrors found to be damaged due to excessive cleaning or from corrosive
material residue will invalidate the warranty for the analyzer.
If the cell mirrors must be cleaned the analysis cell must only be opened in a
CLEAN/DRY/
DUST FREE area to prevent further contamination.
Observe all safety precautions before starting this procedure.
DANGER
ELECTRIC SHOCK
The analyzer operates using mains voltage that is dangerous to life. Make sure that the
power ON/OFF switch at the rear of the panel is set to OFF and the power cable plug is
removed.
The analyzer MUST be earthed using a grounded three core cable suitable for the rating
defined in the General Characteristics (
Table 1-3 ).
Death or personal injury may result if this is not observed.
DANGER
FAILURE TO LOCK-OUT THE GAS HANDLING SYSTEM
Always lock out the gas handling system when shutting down the analyzer. Unauthorized
operation of the gas handling system when maintenance is being performed on the
analyzer or its associated pipes/hoses may result in highly flammable gas being released,
causing fire or explosion.
Death or personal injury may result if this is not observed.
Reference Manual Troubleshooting and diagnostics
00809-0100-4244 January 2020
Reference Manual 85