Perma Pure Mini-GASS 2812T - Manual (Page 7)

7 Mini-GASS User Manual
2. Mini-GASS Components
2.1 Probe and Probe Filter (optional):
The Mini-GASS Probe and Probe Filter eliminates the need for a heated line by mounting the
conditioning system directly on the stack. Once sample is drawn from the stack, it is passed
through a 2 micron ceramic filter to remove oils and acid aerosols. Sample is dried and cooled
immediately after removal from stack to minimize changes in sample composition (Refer to
Appendix D for Installation Instructions).
2.2 Probe Blowback (optional):
The optional blowback assembly to minimize maintenance of the probe filter by forcing air back
through the element and releasing the particles back into the stack (Refer to Appendix D for
Installation Instructions).
2.3 Filtration:
The sample is passed through a 1
μ filter to remove particulates and aerosols. The standard filter in
the Mini-GASS 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.
2.4 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Collected liquid is withdrawn from filter drain port by a vacuum created by an eductor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