Rev 02, 09/21
Perma Pure LLC
• A Halma Company • [email protected] • www.permapure.com
Telephone: 7
32-244-
0010 • Toll Free: 800
-337-
3762 • Fax:
7
32-244-8140
1
001 New Hampshire Ave.,
L
akewood, NJ 08701 USA
7.2
FUNCTION
OF
FILTER
DRAIN
COMPONENTS
7.2.1
Model PCD-3000-W
This model includes an internal eductor operated drain for use with sub-atmospheric pressure sample gas.
When the Hybrid Sample Gas Cooler system is located upstream of the sample pump, the sample gas in the
system is under slight vacuum. To remove any liquid collected in the filter, a vacuum level higher than the
vacuum level inside the filter is required. This vacuum is generated by an eductor (venturi). Compressed air is
supplied to the eductor via an air pressure regulator which causes it to generate the required vacuum. Liquids
including water and coalesced acid mist collected at bottom of the filter bowl are pulled out of the filter via the
metering tube by the drain eductor. The eductor exhaust must be connected to an appropriate drain line as it
will contain sample gas as well as potentially corrosive liquid.
7.2.2
Model PCD-3000-W-DP
This model includes provisions for an external pump operated drain for use with sub-atmospheric pressure
sample gas.
When the Hybrid Sample Cooler system is located upstream of the sample pump, the sample gas in the system
is under slight vacuum. To remove any liquid collected in the filter, a vacuum level higher than the vacuum level
inside the filter is required. An external, separately supplied drain pump is intended to serve this purpose.
Collected liquids at the bottom of the filter bowl are pulled out of the filter by the pump via the bottom drain
bulkhead fitting. The pump outlet must be connected to an appropriate drain line as it will contain sample gas
as well as potentially corrosive liquid.
7.2.3
Model PCD-3000-PR
This model includes a continuous drain for use with positive pressure sample gas.
When the Hybrid Sample Gas Cooler system is located downstream of the sample gas pump or the sample gas
source is under positive pressure, the drain system functions continuously to remove any liquid collected in the
filter. Liquids collected at bottom of the filter bowl are pushed out of the filter by the sample gas pressure via
the metering tube and out of the bottom drain bulkhead fitting. The drain must be connected to an appropriate
drain line as it will contain sample gas as well as potentially corrosive liquid.
7.2.4
Model PCD-3000-PR-CD
This model includes a continuous drain for positive pressure flammable/toxic sample gas.
When the Hybrid Sample Gas Cooler system is located downstream of the sample gas pump or the sample gas
source is under positive pressure, the drain system functions continuously to remove any liquid collected in the
filter. Liquids collected at bottom of the filter bowl are pushed out of the filter by the sample gas pressure,
down to the float operated drain valve. The drain valve prevents sample gas from escaping into the drain line
by closing before the liquid in the tank is fully drained. Only liquid is allowed into the drain line. The drain must
be connected to an appropriate drain line as it may contain potentially corrosive liquid.
