Instruction Manual
June 2007
NGA 2000 CLD
SECTION 4
MAINTENANCE AND SERVICE
WARNING
Before starting work, read the "Essential instruc- tions" on the inside cover and the Safety Summary beginning on page
Failure to follow the safety instructions could result in serious injury or death.
The CLD Analyzer Module requires very little maintenance during normal operation.
The gas path system should be leak tested at least twice a year and after maintenance, replacement or repair of gas path parts.
Occasionally, the intake fan screen may require clean- ing, refer to section
WARNING
Do not operate without covers secure.
Do not open while energized.
Disconnect power to the module(s) prior to replacing components.
This equipment should not be adjusted 
or repaired by anyone except properly qualified service personnel.
CAUTION
Tampering with or unauthorized substitution of components may adversely affect the safety of this instrument. Use only factory documented/ap- proved components for repair.
Because of the danger of introducing additional hazards, do not perform any unauthorized modification to this instrument!
Also, the detector´s reaction chamber and sapphire window may require cleaning, refer to section
White crystal deposits on the windows of the reaction chamber and plugging of capillaries and vent are usually due to sample contaminates such as ammonia reacting with the high ozone levels and NO components. To eliminate the contaminates, the sampling system should be reworked or a preventive maintenance program developed (if dropout is excessive). Another source of crystalline formation is contaminated air.
Several components may require replacement. These are discussed in the following sections.
Tag each connector and its location before disconnecting any wiring. This helps in reassembly.
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