Maintenance and Troubleshooting | 6-23
15. Install the Filterblock Assembly on its mounting screws (on the back-
pan) and tighten them.
16. Reconnect the tubing to the Filterblock Assembly 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
fittings.
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 pres-
sure flow rate test on the Filterblock Assembly to ensure there are no
leaks. See “Sample System Leak Check” in Chapter 3.
18. If the Electronics Enclosure door was opened use a soft, nonabrasive
cloth to gently clean the joining areas (flame path) of the Electron-
ics Enclosure and its door. Close the door and replace the (24) M10
screws. The torque specification to fasten M10 screws is 9.0 Nm, ±0.7
Nm (80 in.-lb, ±9 in.-lb).
19. Restore AC power to the analyzer. After start-up, the analyzer will im-
mediately 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 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
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