6-8 | Model 241CE II Hydrocarbon Dewpoint Analyzer
5. Reconnect all tubing connections. Hand-tighten the nut for each fit-
ting. Using two wrenches, use one to rotate the nut to the original po-
sition with a wrench (an increase in resistance will be encountered at
the original position), then tighten it slightly with the wrench. Repeat
for the other fitting.
6. After ensuring that all connections are made and secure, perform a
leak test on all of the Filterblock’s tubing connections and a high pres-
sure flow rate test on the Filterblock Assembly to ensure there are no
leaks. See “Sample System Leak Check” in Chapter 3.
If a gas leak is detected, repair and retest the fittings until all leaks
have been eliminated.
7. Close all doors and covers (if they were opened) and secure them with
their screws. Tighten the screws to appropriate specifications.
The torque needed to fasten M10 screws on the Electronics Enclosure
is 9.0 Nm, ±0.7 Nm (80 in.-lb, ±9 in.-lb).
8. Turn on the AC power to the analyzer. After retrieving the configura-
tion data from the EEPROM, the analyzer will immediately begin
operation. The Run Time is reset to zero.
9. 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
NOTE
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