56 | IPS-4 Z1/Div1 Analyzer
Always disconnect power and/or external power sources to the ana-
lyzer before opening any covers or doors on the analyzer to check or
perform maintenance on any components within the enclosures.
If it is necessary to open the analyzer’s covers or doors while the cir-
cuits are alive, first monitor the area for flammable gases (and proceed
only when the area is safe). To work on the analyzer with it powered
up and its Electronics Enclosure door open, the purge system must be
in BYPASS mode.
Cleaning/Replacing Parts in the Sampling System
To clean and/or replace parts in the analyzer sampling system:
1. Manually zero the analyzer, isolate the analyzer sampling system from
the sample gas stream, and power down the analyzer [as described in
the analyzer User Manual].
If an external, flame-proof disconnect switch (breaker) has been in-
stalled, open the breaker.
If heated Sample and Vent Lines are used, disconnect power to them.
Before proceeding, test the area around the analyzer for flammable
gases. If a flammable gas atmosphere is present, do not power down
the analyzer or any alternate power sources that supply power to the
analyzer components. Proceed only when the area is found to be safe.
Wait two minutes to allow the high-voltage capacitors to discharge.
2. If the Oven/Sample System Enclosure is heated:
Wear insulated gloves and open the door to allow the Oven to cool
down enough to ensure safe handling.
The components within the enclosure will be hot; take precautions to
avoid burning yourself.
3. Continue with the procedures to disassemble, clean, replace parts in,
and reassemble the appropriate sampling system component and all
associated sample system tubing.
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WARNING
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