Envent Engineering Ltd. Page 31 Revision 2.4
MAINTENANCE
The 330S/331S 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 32.
• 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
31.
• 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 11. 331S & 331SDS Sensing Tape Change
Procedure (Same as the 330S & 330SDS models)
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