Essential Health & Safety Requirements | 33
Installing and Connecting the Purge Fluid Line
Instrument Air or Nitrogen can be used to operate the purge system. This
procedure assumes that Instrument Air is being used and is the same for
Nitrogen. If using instrument air, the air must meet the ANSI/ISA-7.0.01
(1996) specification. If using nitrogen, use only ultrahigh purity (UHP)
nitrogen.
The purge gas must be supplied via a pressure regulator and maintained
at 60 to 115 psi (4 to 8 bar) and must be able to provide a flow of at least
300L/min (after the initial purge, the flow is very low - just enough to
compensate for leaks from the enclosure).
1. Provide a source of either Instrument Air or UHP grade Nitrogen.
2. Before connecting the purge inlet, purge the air line to clear any water
or particulates
3. Connect the air supply to the ¼” purge supply connection fitting on
the top of the analyzer (see figure 6).
4. Ensure that the Bypass Switch is in the ACTIVE position and that all
enclosure doors are closed and latched
5. Open the purge inlet valve and set the regulator to 60 to 65 psi (4 bar).
The left indicator should change from Red to Green and the right
from Black to Yellow.
6. After approximately 5 minutes, the right indicator should change from
Yellow to Black indicating a successful purge.
7. Open the electronics enclosure. The indicators on the purge controller
should go back to red and yellow.
8. Close the inlet valve and open the door and proceed with the analyzer
installation.
The purge system should only be placed into BYPASS if the area is
known to be clear of flammable gases.
!
WARNING
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