Manual

PRINCIPLE OF OPERATION
The ACES system incorporates a Perma Pure Nafion
®
membrane dryer, disposable
0.1 micron pre-filter and a vacuum eductor to supply a clean sample to an electro-
chemical sensor. The dryer is sized to supply a 20-80% RH sample from ambient
air at a flowrate up to 2 L/min.
Refer to the flow sechematic below. By generating a vacuum, the eductor acts as a
pump to draw the sample gas through the system. The sample gas is first pulled
through the filter to remove particulate matter.Then it flows though the inside of the
Nafion membrane tube within the dryer assembly where excess water is removed.
The clean and dry sample gas then exits the system and flows to the gas sensor
where the measurement is taken. The sample gas must now flow back to the
system to be used as a purge gas for the membrane dryer. Upon re-entering the
system it passes through the flowmeter and through a needle valve where it is
expanded to the vacuum level of the eductor. The expanded sample gas is then
suitable use as purge gas and is passed through the annular area of the dryer
assembly and is exhausted to the atmosphere.
1. Mount system to wall using the supplied mounting feet. the flow meter must be
in the vertical orientation fro proper operation.
2. Connect the fitting labeled "Wet Sample Inlet" to the tube from sample point.
3. Connect the fitting labeled "Dry Sample Outlet" to the tube from the analyzer
inlet.
4. Connect the fitting labeled "Dry Sample Return" to the tube from the analyzer
exhaust.
5. Connect the fitting labeled "Compressed Air Inlet" to the compressed air supply
Mount system close as possible to probe and analyzer to reduce response time
and flow restriction. Enclosure is NEMA 4X rated and can be installed outdoors.
However the unit should be protected from direct exposure to the elements.
1. Turn compressed air on. Eductor will draw sample through the system.
2. Adjust regulator to 10-15" Hg of vacuum. Higher vacuum will provide dryer
sample.
3. Adjust valve on top of flowmeter to set desired sample flow rate. Optimal
operating range is 0.5 to 1.5 liters per minute.
OPERATION
Filter Replacement:
To determine if filter needs to be replaced, monitor flow rate of sample gasof
pump. If output begins to drop, it may indicate a clogged filter element.
1. Note orientation of filter. Flow direction is upward.
2. Push lock ring on black elbow fitting twards body of the fitting. This will
retract the internal gripper that holds the filter in the fitting.
3. Pull tube stubs from fitting and repeat for the other end
4. Replace with new filter (part number: AG-DIF-K70).
MAINTENANCE
INSTALLATION
SPECIFICATIONS
Sample
Flowmeter
Sample
Prefilter
Dry Sample
Outlet
Dry Sample
Return
Wet Sample
Inlet
Compressed
Air Inlet
Compressed
Air Exhaust
Fiberglass
Enclosure
Pressure
Regulator
SAMPLE EXHAUST
F1
SAMPLE INLET
PARTICULATE
FILTER
DRY SAMPLE RETURN
FROM SENSOR
PUMP
DRY SAMPLE OUTLET TO
SENSOR
NAFION MEMBRANE DRYER
FLOW METER
WITH VALVE
Description Specification
Dimentions 12"W x 7"H x 6"D
Air Supply Pressure Minimum of 60 psig
Air Usage 1.5 - 2.5CFM
Sample Flow 0.1 - 2.0 L/min
Disposable Filter 95% of 0.1 micron
Inlet Humidity Range 0-99%RH
Outlet Humidity 0-80%RH
1/4" O.D. tube,
polypropylene compression fitting
Filter Model AG-DIF-K70
Dryer Model MD-110-12F-4
Piping Connection