BA02191C SS2100 H
2
S TDLAS Gas Analyzer
Endress+Hauser B-17
As an added precaution, a scrubber efficiency indicator, shown in Figure B–12
on page B–18, is mounted at the outlet of the scrubber. The powder material
in the scrubber efficiency indicator changes color from turquoise to dark grey
if there is any H
2
S breakthrough, as shown in Figure B–13 on page B–18.
Alternatively, regular validation of the system with an appropriate gas standard
will indicate when the scrubber needs to be replaced.
The system will activate a New Scrubber Alarm fault, which triggers the
General Fault Alarm to indicate when it is time to replace the scrubber and
scrubber efficiency indicator. Once the scrubber and scrubber efficiency
indicator have been replaced, reset the scrubber lifetime monitor with the New
Scrub Installed parameter and the General Fault Alarm with the Reset
option for the General Alarm DO parameter (see “To change parameters
in Mode 2” in the Description of Device Parameters for your analyzer).
If scrubber replacement is necessary, refer to “To replace the scrubber and
scrubber efficiency indicator” on page B-19. Replacement scrubbers,
scrubber efficiency indicators, and other replacement parts can be ordered by
the part numbers listed in Table A–2 on page A–12.
When specifying gas standards, indicate H
2
S in methane balance.
For a measured range of 0-20 ppm, a concentration of 4-16 ppm
is recommended.
Figure B–11 Predicted scrubber lifetime based on
average H
2
S load
20
0
40
60
80
100
20
0
40
60
80
100
REMAINING CAPACITY (%)
0 100 200 300 400 500 600
DAYS
4 ppmv, 2” Scrubber
100 ppmv, 3” Scrubber
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