FF-250 Series Filter Automatic Drain
 High
sulfur based fuels, when burned, release large amounts of sulfur dioxide
into the atmosphere. When a gas stream contains a high concentration of
sulfur dioxide and water, there is a likely chance there will also be
sulfuric acid mist present. Since sulfuric acid forms at lower
temperatures, it is not removed by filters in stack probes where the
gases are still quite hot. It often forms too slowly even to be
adequately removed by chiller/condenser
systems. Because of this, sulfuric acid corrosion occurs downstream of
the chiller, damaging analyzers or other components of the sampling
system.
Perma Pure's coalescing filter with
automatic drain can periodically remove the condensed acid. The
automatic drain valve is controlled by a repeat cycle timer that is used
to switch a solenoid valve. For a gas stream under vacuum, when this
valve energizes it supplies compressed air to an eductor, generating a
vacuum and thereby extract the condensate from the filter bowl. A
minimum of 30 psig of compressed air is required to overcome the
restriction caused by the cracking pressure of the check valve. This
valve is installed in the condensate drain line and is intended to
prevent back flow of air between drain cycles. If a gas stream is under
pressure, the energized valve allow the pressure in the filter bowl to
automatically push the condensate out of the bowl.
Installation of Automatic Drain Assembly
- Remove cover.
- Mount the base to the wall
with #8 size screws or bolts.
- Replace cover.
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For Vacuum style only:
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For Pressure Style only: |
- Connect 30 to 80 psig
of compressed air to the air inlet port.
- Connect the outlet end
of the supplied check valve to the vacuum supply port.
- Connect the inlet end
of the check valve to the filter's condensate drain port.
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- Connect the condensate
drain port to the drain valve inlet port.
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- Connect the condensate
drain port to a suitable location. Hold the 1/4" male pipe
nipple with a wrench when connecting to the drain line. Do
not connect to a line with an i.d. smaller than 1/4". Doing
so may cause the system to generate too little vacuum to
drain the filter bowl.
- Plug in the power cord.
The system is operational whenever power is supplied.
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To
Adjust Drain Timer
The timer has been factory set
at 6 sec. drain every 15 minutes |
Remove the four cover
screws to access the DIP switches to adjust the timing
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Drain Time Adjustment
(Left DIP switch)
Adjustable from 0.1
minutes, all but first switch in the off position,
to 102.3 minutes, with all switches in the on
position
Cycle Time Adjustment
(Right DIP switch)
Adjustable from 0.25
hours, all but the first switch in the off position,
to 255.75 hours, with all switches in the on
position
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