Envent 330S-Ex, User Manual, Page: 40 / 71

Envent Engineering Ltd. Page 35 Revision 1
MAINTENANCE
The 330S-Ex and 330SDS-Ex H
2
S analyzer will provide reliable service with
very little attention. If the analyzer is kept clean there should be no
requirement to recalibrate from factory gain settings. However, regular
check-up (at least every three months) will ensure that the analyzer is
operating to specifications.
• Ensure that the H
2
S sensing tape take-up and feed reels are tight
• Ensure that the flow meters, humidifier tubing and sample chamber
tubing are free of liquid or particulate contamination. If the sample
conditioning system is flooded with liquid, refer to "Sample Conditioning
System Cleaning Procedure" on page 36.
• Ensure there is enough H
2
S sensing tape, especially if a low H
2
S
sensing tape sensor is not installed. Refer to "H
2
S Sensing Tape Change
Procedure" on page 35.
• Check the sample conditioning filter(s) every time the H
2
S sensing tape
is replaced. Replace the filter(s) as required.
H
2
S Sensing Tape Change Procedure
Figure 17. 330S-Ex & 33SDS-Ex H
2
S Sensing Tape Change Procedure