6-16 | Model 241CE II Hydrocarbon Dewpoint Analyzer
11. Using the alignment pins as guides, make sure that the electrical
connectors are properly aligned and then push the Cooler Housing di-
rectly toward the Electronics Enclosure. While holding the Measuring
Cell/Heatsink Assembly firmly in place with one hand, fully thread in
(1) of the upper screws. Reinstall the remaining (3) screws and tighten
them in a cross-pattern. The torque specification is 4.0 Nm, ±0.7 Nm
(36 in.-lb, ±9 in.-lb).
12. Reconnect the tubing to the inlet and outlet fittings on the Measuring
Cell and hand-tighten the nut for each fitting. Using two wrenches,
use one to rotate the nut to the original position (an increase in re-
sistance will be encountered at the original position), then tighten it
slightly. Repeat for the other fitting.
13. Reconnect the Purge Air Connection tubing to the Cooler Housing.
14. Perform a leak check on the sample system fittings that were discon-
nected.
15. Using a soft, nonabrasive cloth, gently clean the joining areas (flame-
path) of the Electronics Enclosure and its door. Replace and tighten
the M10 screws to 9.0 Nm, ±0.7 Nm (80 in.-lb, ±9 in.-lb).
16. Restore AC power to the analyzer. After start-up, the analyzer will im-
mediately begin operation. The Run Time is reset to zero (‘0’).
17. Reset the Mirror Low setpoint temperature (MTLo) and the purging
time (Purge) to their normal (original) operating values.
The results obtained by the first few measuring cycles are usually
slightly too low (invalid) due to contamination. This can be caused by
the residual water remaining from the cleaning (after maintenance)
and/or exposure of the sample system to the atmosphere – i.e., diluted
with residual air after installation or maintenance.
Depending on the degree of contamination and the purging duration,
the number of measuring cycles required to obtain valid results can
vary. Typically, five measuring cycles will be sufficient to remove the
water or air contaminants after the sample system has been exposed to
water or the atmosphere.
NOTE
See “Sample System
Leak Check” in Chapter 3.
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