Ametek 241CE II User Manual page 109

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See "Sample System
Leak Check" in Chapter 2.
PN 903-8797, Rev A
11. Using the alignment pins as guides, make sure that the electrical con-
nectors are properly aligned and then push the Cooler Housing directly
toward the Electronics Enclosure. While holding the Measuring Cell/Heat-
sink Assembly firmly in place with one hand, fully thread in one (1) of the
upper screws. Reinstall the remaining three (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 resistance 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 disconnect-
ed.
15. Using a soft, nonabrasive cloth, gently clean the joining areas (flame
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 immedi-
ately 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.
Maintenance and Troubleshooting | 4-21
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