The AADCO 737-series Pure Air Generators have gained
universal acceptance as the instruments of choice where there
is a requirement for a reliable, absolute source of zero air.
Hundreds of these units are now distributed throughout the
world, providing zero air for calibration purposes or relieving
users from the tedious problems associated with stored air
cylinders. Users include most federal and state air monitoring
boards, foreign air monitoring networks, many federal
analytical laboratories and a considerable number of industrial
laboratories. Their ruggedness and compactness permit their
use for in-plant process applications as well. In addition to
serving as a source for zero air they provide clean, dry air for
valving, solenoids and other process equipment. The life span
of process instrumentation is greatly prolonged and
maintenance is minimized through use of clean, dry air.
OUTPUT PURITY
The air product from the 737-series Pure Air Generators will
easily satisfy the most demanding requirement for purity.
AADCO's purity specifications: < 1 ppb ozone, methane,
hydrocarbons, NO/NOx, H2S, SO2, COS, CO, CO2, SF6 and
fluorocarbons. All particulates are removed from the source
air and never appear in the air product. It is typical for air
monitoring equipment, calibrated to zero with cylinder air
which is labeled as zero air, to indicate a greater deflection
through zero when connected to a 737-series Pure Air
Generator, clearly demonstrating the greater purity over
cylinder air. In addition, the dewpoint of the air product from
any 737-series Pure Air Generator will not exceed -60 F,
making this the ideal air source. Equally important, the oxygen
concentration is a constant 21%, as found in the ambient
environment. This, again, is in contrast with zero air cylinders
where a 6-8% variation in the oxygen concentration is not
unusual. This variation has a profound effect when calibration
of ozone generators and ozone monitors or total hydrocarbon
analyzers is attempted. This oxygen variation effect becomes
even more pronounced when multiple instruments and
locations are involved.
CONSISTENT ZERO AIR
The specified purity described above remains absolutely
constant from day-to-day, month-to-month and year-to- year.
This consistent purity is available from one AADCO pure air
generator to the next, anywhere in the world, assuring more
positive collaboration between widely separated laboratories
which had previously depended upon locally obtained
cylinders of zero air. The stable, reproducible output permits
precise zero calibration of all ambient air monitoring
instruments, regardless of location. It also allows those
researchers pursuing environmental impact studies to reliably
determine the natural ambient background of any environment.
Analysts concerned with the analysis of air from
environmental chambers, ambient air, the contents of air
cylinders, physiological respirations, etc. are now able to
practice vacancy chromatography, differential response
chromatography or direct analysis by using the pure air
generator output as reference air. Laboratory use of a pure air
generator, such as using air as an aid for such activities as
evaporation, concentration and derivitization, can avoid side
reactions and sample contamination with pure, dry air instead
of air from questionable sources such as air cylinders or
laboratory stopcocks.
SAFE ELIMINATION OF AIR CYLINDERS
In addition to generating consistently clean air, the AADCO
pure air generators have effectively eliminated air cylinders
and their associated regulators from a great number of
laboratories. They now offer an element of safety and
convenience for laboratory personnel which has been
unavailable until now. All of the inconveniences associated
with air cylinders are eliminated the handling of bulky
cylinders, mismatched regulators, storage of unused cylinders
and the possible mislabeling of FULL and EMPTY, causing
uncertainty over residual volume and pressure, demurrage,
leaks, dangers of explosions, unavailability of air at critical
times due to either poor cylinder deliveries, ordering delays,
etc. With floor space at a premium in most laboratories, use of
a pure air generator frees that space normally occupied by air
cylinders and clean air is always available. These generators
are also found in mobile laboratories and remote monitoring
stations where zero air is required but cylinder deliveries and
changeouts are difficult logistical problems. Some of
theAADCO high output units have found application as
dry spec, etc. Those applications and techniques which
involve Inordinate consumption of quality air, such as atomic
absorption, some high pressure liquid
chromatography Instruments and flame photometers are
best served by pure air generators. These units have proven to
be more convenient and economical over the battery of air
cylinders which are required to sustain these operations.
COMPLETELY SELF-CONTAINED
All AADCO 737-series Pure Air Generators are completely
self-contained units, with their own oil-less air compressors
and unique contaminant removal systems. They are offered in a
range of output volumes from 1-Liter/minute to 100
Liters/minute. The small, 1-Liter/minute unit is completely
self-contained within one cabinet, including compressor. Its
compactness, less than two cubic feet, and light weight, less
than thirty pounds, permit easy portability from one work area
to another. Bench space requirements are minimal?12 inches
wide by 18 inches deep. All connections are made externally
to the unit and start-up is accomplished in less than 5 minutes.
Every 737-Series Pure Air Generator contains a purification
reactor, input and output pressure gauges for ease in
monitoring the condition of the compressor systems
andestablishing output pressure for the receiving
equipment, 9-inch rotameter calibrated for the full range of
output for each pure air generator, completely variable
output flow adjust valve and output pressure regulator. No
pressure regulator systems need be supplied by the user.
Output flow and output pressure are constant without the use of
ballast tanks.
MODELS AVAILABLE
AADCO offers a variety of models from which selection is
made depending upon application, output volume
andmounting requirements. Mounting options include
either bench mounting or rack-mounting for all units,
regardless of output volume. For those instruments
producing volumes greater than 10-Liters/ minute, larger
components are entailed which necessitate a larger housing.
BENCH TOP UNITS
Aadco manufactures units that house components capable of
output volumes of 0-50 and 0-100 liters/minute; 0-20 and 0-30
Liters/minute and 0-1, 0-5 and 0-10 Liters/ minute
respectively. We manufacture the full family of bench-mounted
pure air generators whose output volumes are described
above. Dimensions of the instruments are: 21"H x 17 1/2"W x
25"D; 15"H x 17 1/2"W x 21"D; 15"H x 17 1/2"W x 18D,
respectively. All units contain a purification reactor, input and
output pressure gauges, 9-inch rotameter, output flow adjust
valve?all components sized to the output flow requirements
of the particular instrument. All of these instruments function
exactly alike, differing only in power requirements, component
sizing and cabinet dimensions.
The 737-12 bench-mounted Pure Air Generator system, with
maximum output volume of 0-30 Liters/min. @ 0-50 psi, is
available complete with compressor. The upper unit contains
the purification system, with methane reactor and heat status
indicator systems. A cycling heat indicator lamp gives
assurance of temperature maintenance of the methane reactor at
its preset operating temperature. Should the indicator lamp be
suspect, front panel test jacks permit monitoring with a VOM
for further verification of heat status. All fuses are front panel
mounted for rapid and easy accessibility- All electrical
controls are also located on the generator front panel,
including the power switch to the compressor, even though the
compressor is located in a separate unit. Electrical connection
between the two units is made through a twist-lock umbilical
which can also be connected to any AC outlet without special
adapters.
The lower unit houses the compressor, mounted on a special
vibration-isolation support. High volume cooling fans sustain a
compatible internal temperature for optimum operation. Air
enters through a strategically placed opening in the top of the
unit, passes through a baffle system to eliminate sound from the
unit, across the compressor and out through several openings
located on the rear floor of the unit. Should there be a failure
of the air circulating fans, an automatic thermal switch cuts off
electrical power to the compressor, avoiding overheating and
possible damage. This same thermal safety is incorporated in
all compressors which AADCO supplies with pure air systems
or as replacements. The complete interior of the unit is
covered with high density sound absorptive insulating
material, including the baffle system. Placement of the
generator and compressor units may be side-by-side or one
above the other, as shown. The high temperature connecting air
hose which runs between the two units is of sufficient length to
permit either configuration.
RACK MOUNTED UNITS
This purification unit is mounted immediately above the
compressor unit, for all systems other than the 737 R-1 pure
air generator. This one particular generator system, which has
a maximum output volume of 1-Liter/minute, contains within a
single cabinet both the compressor and purification systems, as
with the 737-1 bench-mounted unit. All other rack-mounted
systems require separate cabinets for the purification and
compressor sections. The same attention to detail is paid to
selection of components for the rack-mounted systems as with
the bench-mounted units. Heat indicator lamp, test jacks and
front panel fuses are also standard with these units affording
ease of service and component accessibility to
theoperator. The rack-mounted compressor units sustain
the same baffle system and high volume cooling as described
for the bench-mounted systems. The same safety features
prevail, including the thermal safety switch for the compressor
in the event of failure of the cooling system.
Soundproofing is also an available option, as are slides,
selected for weight capacity, with extenders to fit any size
cabinet. All front panels are a full 19-inches, with mounting
slots.
Output volumes for these rack-mounted units range from
1-Liter/minute to 30-Liters/minute. Purchases may be made to
include or exclude compressor or silencer housing. Consult the
price list or the factory for full listing. Factory technical
recommendations for applicability or appropriate size
considerations is especially suggested, particularly
forthose who are considering their first system in order to
ensure purchase of systems which will satisfy all of
the requirements of the user.
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