737-104 Auto Pure Air Manifold - AADCO 737 Series Operating Instructions Manual

16.0

737-104 AUTO PURE AIR MANIFOLD.

16.1 Auto Pure Air Manifolding only occurs outside of the pure air generator. See
Figures 11b and 11c. All of the manifolding connections are made outside of
the pure air generator and are visible to the operator.
16.2 The purpose of this manifold is to be certain that pure air is available to the
analytical instruments at all times, whether source air to the pure air generator
is available or not. The air supplies to the manifold are usually pure air output
from the generator and a cylinder of clean air. If the pure air output from the
generator should become unavailable, the air cylinder will automatically
become the source of the pure air to the analytical instruments.
16.3 During operation, the pure air from the pure air generator with output pressure
set at 55-psig is directed to the using equipment. Should the output pressure of
the generator fall below 50-psig (the pressure setting of the standby air
cylinder) the air cylinder will supply air to the instrument until the generator is
once again producing pure air.
16.4 In operation, the Auto Pure Air Manifold is connected to the PURE AIR outlet
fitting on the rear of the pure air generator by means of the swage-type, tube-
end reducing fitting.
isolated by, and at the inlet to, the check valve. Final pure air connection to the
using equipment is made using remaining fitting.
16.5 Once in operation, the output pressure from the pure air generator is set to 55-
psig via the OUTPUT PRESSURE REGULATOR, Figure 4 (5), and flows are
established at the instrumentation. The OUTPUT FLOW ADJUST, Figure 4
(13), is completely counter clockwise.
16.6 Once this system is in operation, open the air cylinder and set the output
pressure at 50-psig. Should the supplied system compressor or "house" air
(whichever is being used to supply unclean pressurized air to the pure air
generator) fail, the output pressure of the pure air generator will fall below 50-
psig and the air cylinder, set at 50-psig, will automatically supply air to the
instrumentation until the system input air source is restored.
Cylinder air is connected to the manifold inlet fitting
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