EC155 CO
2
and H
2
O Closed-Path Gas Analyzer
46
14.
Replace the CO
2
span gas with an H
2
O span gas of known dewpoint.
Allow the gas to flow through the sample cell; as before, higher flows may
be desired for a couple minutes to more quickly establish equilibrium
before resuming a flow between 0.2 and 0.4 LPM. Wait for the readings to
stabilize.
15.
Enter the known dewpoint (in °C) in the
Span Dew Point
box and press
Span
. This will cause the analyzer to adjust the value of its
H
2
O Span
parameter, forcing the measured dewpoint to the value specified. Verify
the dewpoint reads the correct value.
16.
The zero-and-span procedure is now complete.
9.5 Replacing the EC155 Desiccant/CO
2
Scrubber Bottles
If more than one year has passed since replacing the desiccant/scrubber, or if
zero-and-span readings have drifted excessively (see Section
(p. 43)
, above), the desiccant/scrubber bottles within the EC155 analyzer
head should be replaced as follows:
1.
Remove the analyzer in the same way as explained in Section
(p. 40)
, of this manual.
2.
Unscrew the large metal plug found at the base of the analyzer next to the
analyzer cable; it should only be hand-tight (see FIGURE
). Once the
plug is removed, tip the analyzer up so the desiccant/scrubber bottle falls
out. Insert a new bottle lid-first into the analyzer. Firmly screw the plug
back in place.
EC155 instruments sold prior to July 2017 were sold with
scrubber bottles that contained strong oxidizing agents.
Avoid direct contact with the chemicals inside the bottles.
Ensure the work area is well ventilated and free of any
reactive compounds including liquid water. Store used
chemical bottles in a sealed container until disposal.
3.
On the other end of the analyzer, remove the two seal-screws from the
metal cap (see FIGURE
). Carefully pull the cap off. Tip the analyzer
up so the desiccant/scrubber bottle falls out. Insert a new bottle lid-first.
Push the cap back on, and use two new seal-screws (included with
replacement desiccant/scrubber bottles) to hold the cap in place.
While the metal cap is removed, avoid touching the detector
and its electronics.
4.
Insert the analyzer back into place, making sure to latch the analyzer’s
struts down. Do not operate the analyzer for at least 24 hours (longer if in
humid environments) to give the chemicals time to purge the air inside the
analyzer. A zero-and-span procedure should then be performed before
resuming measurements.
CAUTION
CAUTION
Summary of Contents for EC155
Page 78: ...E 1 Appendix E Safety Data Sheets SDS E 1 Molecular Sieve Type 13X ...
Page 79: ...Appendix E Safety Data Sheets SDS E 2 ...
Page 80: ...Appendix E Safety Data Sheets SDS E 3 ...
Page 81: ...Appendix E Safety Data Sheets SDS E 4 ...
Page 82: ...Appendix E Safety Data Sheets SDS E 5 E 2 Magnesium Perchlorate ...
Page 83: ...Appendix E Safety Data Sheets SDS E 6 ...
Page 84: ...Appendix E Safety Data Sheets SDS E 7 ...
Page 85: ...Appendix E Safety Data Sheets SDS E 8 ...
Page 86: ...Appendix E Safety Data Sheets SDS E 9 ...
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Page 89: ...Appendix E Safety Data Sheets SDS E 12 E 3 Decarbite ...
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