Perma Pure GASS-2040 - Manual (Page 7)

7 GASS-2040 User Manual | Original Instructions
2. GASS-2040 Components
2.1 Probe, Probe Filter and Automatic Blowback (optional):
The GASS-2040 system with integral probe filter eliminates the need for a high temperature
heated line by conditioning the gas sample at the sample gas extraction point on the stack. When
sample gas is drawn from the stack, it is passed through a 2 micron ceramic filter to remove oil
and acid aerosols. The sample gas is dried and cooled immediately after removal from stack to
minimize changes in sample composition (Refer to Appendix D for Installation Instructions).
The optional blowback assembly minimizes maintenance of the probe filter by periodically pass-
ing compressed air back through the element. This action dislodges captured particles and forces
them back into the stack. Included with the blowback system is a calibration gas flow sensor
which prevents blowback from occurring while calibration gas is flowing.
2.2 Filtration:
The sample is passed through a 1 μ filter to remove particulates and aerosols. The standard filter in
the GASS-2040 system has a borosilicate glass filter element with a fluorocarbon binder. This
element is disposable and will withstand high sample temperatures. In addition to removing
particulates, it coalesces liquid aerosols and droplets.
Two flow patterns are possible with this filter:
1. Particulate Filter: Filter installed with flow passing
from outside to the inside of the element. With this
installation, collected particulates will build up on
outside surface of the element allowing visual
inspection of its condition.
2. Coalescing and Particulate Filter (See Figure 2):
Filter is installed with flow passing from inside of
element to the outside. An automatic drain is usually
installed to remove the condensate.
2.3 Automatic Filter Drain (optional):
If coalescing is anticipated, system should be fitted with automatic filter drain to
periodically remove collected liquid mists. In most cases, these mists will be acid mists.
Automatic drain is available in vacuum or pressurized style.
1. Vacuum Configuration:
Collected liquid is withdrawn from filter drain port by a vacuum created by an eductor
expanding compressed air through a venturi. This is done in cycles and controlled
by adjustable digital timer that switches a solenoid valve controlling compressed air
supply.
Figure 2