PN 903-8797, Rev A
15. Install the Filterblock Assembly on its mounting screws (on the backpan)
and tighten them.
16. Reconnect the tubing to the Filterblock Assembly and hand-tighten the
nut for each tting. Using two wrenches, use one to rotate the nut to the
original position (an increase in resistance will be encountered at the origi-
nal position), then tighten it slightly. Repeat for the other ttings.
17. After ensuring that all connections are made and secure, perform a leak
test on all of the Filterblock’s tubing connections and a high pressure ow
rate test on the Filterblock Assembly to ensure there are no leaks. See
“Sample System Leak Check” in Chapter 2.
18. If the Electronics Enclosure door was opened use a soft, nonabrasive cloth
to gently clean the joining areas (ame path) of the Electronics Enclosure
and its door. Close the door and replace the 24 M10 screws. The torque
specication to fasten M10 screws is 9.0 Nm, ±0.7 Nm (80 in.-lb, ±9in.-lb).
19. Restore AC power to the analyzer. After start-up, the analyzer will immedi-
ately begin operation. The Run Time is reset to zero (‘0’).
20. Reset the Mirror Low setpoint temperature (MTLo) and the purging time
(Purge) to their normal (original) operating values.
The results obtained by the rst 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, ve measuring cycles will be sucient to remove the
water or air contaminants after the sample system has been exposed
to water or the atmosphere.
4-28 | 241CE II Hydrocarbon Dewpoint Analyzer
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