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4.0
OPERATION.
4.1
Once the instructions outlined in Sections 3.0 thru 3.6 have been followed, whereby
the air source has been connected to the pure air generator, leak checked, and the
power cord inserted into a proper outlet, the BENCH-MOUNTED unit utilizing
"house" air as the primary air supply is ready for operation.
NOTE:
AT THIS TIME THERE SHOULD BE NO EQUIPMENT CONNECTED
TO THE PURE AIR GENERATOR.
4.2
The INPUT PRESSURE gauge, Figure 1 (6), should indicate the source air
pressure which must be not less than 50-psig nor more than 95-psig. See Section
3.4.
4.3
Depress the POWER SWITCH, Figure 1 (1). The POWER lamp should light, there
should be an audible "click" of the inlet solenoid valve of the purification reactor
followed immediately by a momentary decrease of input pressure and the
METHANE HEAT lamp, Figure 1 (12), if present, should light.
4.4
If no methane reactor is present, within one-minute (one full purification cycle) the
unit is ready to deliver clean air. The operator now may adjust the output pressure
to his needs by turning the OUTPUT PRESSURE REGULATOR, Figure 1 (9),
clockwise until the desired pressure appears on the OUTPUT PRESSURE GAUGE,
figure 1 (8).
4.5
To determine the proper output pressure from the pure air generator, it is necessary
to ascertain the greatest pressure required by any or all of the using instruments.
For example, if there are five instruments and the highest pressure requirement for
any or all of the instruments is 30-psig, then the output pressure can be set no
lower than 40-psig. This 10-psig pressure differential is mandatory for proper
operation of any differential pressure regulator. The 40-psig accommodates not
only that instrument with the 30-psig requirement but all of the others as well.
4.6
The pressures and flows at each of the using instruments should now be set
according to the recommendations of the manufacturer. If snubbers are present as
flow regulation devices, only proper pressure settings are required. If pressure and
flow settings are both required, set the pressure and then establish flow using
bubble towers or mass flow meters for accurate settings.
NOTE:
Any instrumentation which is sensitive to even slight variations in oxygen
concentration; e.g., flame ionization detectors or flame photometric
detectors, etc.; all require incorporation of a mixer-receiver, Figures 5
and 8 (10), within the pure air generator prior to use by the above
mentioned detectors. NDIR, chemiluminescent, photoionization,
6
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