Metek 920, Operator'S Manual With Essential Health And Safety Requirements

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Installation and Start-Up | 3-31
To ensure safe operating conditions, the analyzer will not power up until
the MiniPurge
®
system has been connected to the instrument air sup-
ply ( ALARM/PRESSURIZED indicator is GREEN) and has successfully
completed its purge timing cycle (the PURGE TIMING/STATUS LEDs
are now off) and the enclosure is pressurized.
After powering up the analyzer for the first time, certain checks must be
performed with the Electronic Enclosure door open to ensure the ana-
lyzer is operating properly. These checks are discussed in the following
power-up procedure. If problems are encountered during power-up, refer
to “Start-Up Diagnostic Checklist” in this chapter, for help in diagnosing
and correcting problems.
Always disconnect main AC power and/or external power sources
to the analyzer before opening any covers or doors on the analyzer to
check or perform maintenance on any components within the enclo-
sures.
If it is necessary to open the analyzer’s covers or doors while the
circuits are live, test the area for flammable gases (and proceed only
when the area is safe).
Purged Analyzer (Hazardous Location) Applications
To work on the analyzer with it powered up and its Electronics
Enclosure door open, the Purge Bypass Switch must be in the
“
BYPASS ” position.
When the Electronics Enclosure door is open, take appropriate precau-
tions to avoid electrical shock. Hazardous voltages are present inside.
Do not apply power to the analyzer if any of its flamepaths appear to
be scratched, dented, or worn. Applying power to an analyzer with a
damaged flamepath is dangerous and could result in serious injury
or death, and/or serious damage to equipment. See “Examining and
Caring for the Flamepaths” in Chapter 5.
Replace parts immediately if damage or wear is apparent. Contact
AMETEK if there is any doubt about the integrity of any flamepath.
!
WARNING
!
WARNING
Figure 3-10.
Purge Bypass Switch
label.
BY
PA
SS
ACTIV
E