SS2100 H
2
S TDLAS Gas Analyzer BA02191C
B-16 Endress+Hauser
4. Compare the current readings with the past readings to determine
any variations. Reading levels should remain consistent.
5. If reading levels decrease, check the filters.
To check filters
1. Shut down the system following the procedure in “Shutting Down
the SCS” on page 4-7.
2. Inspect, repair or replace the filter as required. Refer to “Replacing
the Filter” on page B-8.
3. Restart the system following the procedure in “Starting up the
SCS” on page 4-4.
Servicing the H
2
S Scrubber
The H
2
S scrubber contains material that gradually loses its scrubbing ability
with use. The lifetime of the material depends on how much H
2
S flows through
the scrubber (gas composition) and how often (switching frequency). Thus,
scrubber lifetime is very application specific.
The Endress+Hauser SS2100 analyzer predicts the remaining scrubber
capacity by using the actual H
2
S concentration measurements and dry cycle
durations to calculate how much cumulative H
2
S has been removed by the
scrubber. Scrubber lifetimes have been simulated for typical natural gas and
fuel gas applications. As shown in Figure B–11 on page B–17, under normal
operating conditions, a 2 in. scrubber in a natural gas application with an
average H
2
S concentration of 4 ppmv will last for many years, whereas a 3 in.
scrubber in a fuel gas application with an average H
2
S concentration of 100
ppmv would be expected to last approximately 190 days.
Do not leave the SCS door open any longer than absolutely
necessary. Endress+Hauser recommends no more than 60
seconds.
For additional information, refer to “Service” on page B-25.
Due to the chemical properties of the process samples, care must
be taken to repair or replace components with proper materials of
construction. Maintenance personnel should have a thorough
knowledge and understanding of the chemical characteristics of
the process before performing maintenance on the SCS.
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